Recently, with the aggressive scaling of the semiconductor process, silicon based semiconductor technologies have been progressively expanded into the millimeter-waves (mmW) and Terahertz (THz) applications. Cost-effective silicon based millimeter-wave/Terahertz integrated circuits (IC) design and fabrication are increasingly possible and feasible for many applications in medical, security, and non-destructive testing fields, as well as for military applications, such as, target discrimination, air and space communications. This talk will introduce silicon based device modeling, millimeter wave and Terahertz IC circuits and Tx/Rx system design techniques for terahertz communications and imaging applications, and share latest research results with audience.

This talk discusses the design considerations of RF/analog integrated circuits with supply voltages below 0.5V. The problem is fundamentally driven by SoC designs where the RF/analog and digital cores share the same supply voltage. Ultra-low voltage design is also driven by energy-efficient and energy-harvesting applications. We try to accommodate design challenges from transistor-level analog techniques, while the digital-assisted design aspects are also discussed. A 0.15V-supply-voltage nanowatt ADC was achieved and a 0.25V delta-sigma ADC with 73dB SNDR was measured, which demonstrated the lowest supply voltage and highest resolution in all sub-0.5V ADCs reported to date. This presentation is based on the works that have been presented at ISSCC, CICC, ESSCIRC and T-MTT and TCAS-II.

With the relentless increase in population density, the anthropogenic expansion into natural terrestrial hazard zones has become irreversible resulting in ever more catastrophic disasters, not only in the Asia-Pacific region more so within the entire tropical belts engulfing Mother Earth. Thus not only the Indonesian-Pacific Islands, so also South America, Africa and back via the Indian Ocean Islands to Asia-Pacific, these natural events like volcano eruptions, earthquakes with emerging tsunami, cyclones and severe down pours have caused havoc, loss of lives, destruction of infrastructure and above all intentional manmade interference resulting in the deterioration of pristine tropical jungle forests. Matters have become so bad that proposals are forthcoming for equating oil-palm mono-cultures with pristine tropical jungle habitat by greedy developers mostly exterior to local environmental regions suffering helplessly from such criminal machinations. What is required is around-the-clock local and wide-area surveillance and remote sensing of the vegetative cover for which first well designed optical equatorially orbiting satellite sensors had been developed but their successful implementation is failing because of the ever increasing cloud, precipitation, humidity and aerosol cover within the entire equatorial belt of ± 12° per one-day revisitation, within Tropics-belt of ~ ± 23.7° latitude rendering penetration at optical wavelength mostly ineffective. Hence, we must take recourse to microwave sensing, and implement radar and synthetic aperture sensors from air and space operational at day & night independent of weather; and the sensors especially suited are the fully polarimetric POL-SAR sensors developed for satellite remote sensing by the major SAR technology development centres worldwide. The challenge is thus to develop equatorially orbiting SAR, preferably POL-SAR satellite sensors, within the desirable P/L/S/C/X/Ka multi-bands, which does pose severe technological problems due to the steep incidence-angle illumination on one hand, and because of the fact that the major SAR Technology Designers reside far outside the equatorial belt not being excited about SAR sensor development for the tropical belt anywhere. Therefore, we need to mobilize and draw full responsible attention of the main SAR Development Centres worldwide such as NASA/JPL, ESA/ESTEC, JAXA/EORC, CSA/SAR, DLR/SAR, DSTO/SAR, ISRO/SAC, INPE/SERE plus NTU-Temasek, NCU-CSRSR, LAPAN/RANCABUNGUR, and so on; joining forces and strongly contributing to a viable multi-band general bi-static (including cross/along)-track POLSAR sensor technology, well suited for equatorial monitoring within orbits of ± 12 ~ 15° latitude for one-day local imaging, and within the tropics-latitudinal-belt of ± 23.7° 3-day 1 re-observations. Once this urgent goal is achieved, local regions could be observed daily several times for along-track wide-swath observations within altitudinal ± 6° coverage pertinent to ocean surface and current assessments within the Indonesian Archipelago of more than 17,000 populated islands and its neighbouring regions.

This presentation addresses the recent research progress in antennas for UHF RFID readers, WLAN and millimeter 60GHz applications. Three topics will be presented as follows:
(1)   Two-Dimensionally Scanning Antenna Array for UHF RFID Systems. The UHF antenna array composed of 9 elements achieves the scanning angles of ±60° with 10 dBi gain at xz-plane and ±50° with 10 dBi gain at yz-plane, respectively. The reading rate of the proposed array achieves 100% in the metal cavity with 18dBm input power.
(2)   Dual-polarized Antenna Array for 5G WLANs. The antenna array consists of 8 printed dipoles with bow-tie structure, a feeding network and a metal wall. Every two printed dipoles are positioned orthogonally to realize dual polarization. The antenna bandwidth for two ports is around 1GHz VSWR<2 and the measured gains are 13.8dBi and 14.1dBi for two ports, respectively.
(3)   Antennas for 60GHz applications. A novel rectangular multi-layered micro-coaxial transmission line is proposed with low loss and easy integration with CMOS technology. The antenna design based on the proposed rectangular micro-coaxial process is introduced. The performance of cavity-back patch antenna array and E-shape circular polar antenna array structure based on rectangular micro-coaxial process is compared and discussed.

The four dimensional (4D) antenna arrays introduce a fourth dimension, the time, into conventional antenna arrays. Owing to the new design freedom, four dimensional antenna arrays are very promising for high performance antenna array designs. In this talk, the theory and applications of the four dimensional antenna arrays will be discussed. We will demonstrate the attractive features through many 4D planar antenna array designs. The key techniques in these designs will also be introduced. In these planar antenna array designs, the sideband radiations are suppressed to enhance the radiation efficiency at the center frequency. Alternatively, we also studied the 4D antenna array from a new perspective, i.e., the radiations at the first sideband are intentionally enhanced for achieving multiple beams at harmonic frequencies. It allows receiving multiple signals simultaneously from different directions using a single antenna array. The resultant antenna array found applications in monopulse radar systems. Other typical applications of the 4D antenna arrays including adaptive beam nulling, beam scanning without phase shifting, and adaptive beamforming will be finally introduced.

Integration of the method of moments (MoM) and the finite-difference time-domain method (FDTD) into the iterative multi-region (IMR) technique is presented in this talk. This hybrid method combines the desirable features of MoM and FDTD to solve large scale antenna and scattering problems more efficiently. The idea of this hybrid method based on the IMR technique is to divide an original problem domain into multiple unconnected subregions and use the more appropriate method in each domain. For instance, if a problem domain is composed of a thin wire antenna and an arbitrary shaped inhomogeneous scatterer, each of these objects can be placed in a separate subregion, the thinwire antenna can be solved using the MoM while the other region can be solved using FDTD, and their solutions can be combined in an iterative algorithm to achieve the combined subregions solution. The interaction between the subregions is based on the radiated fields due to current distribution on the antenna from the MoM region and equivalent currents on the surface of a Huygens’ box from FDTD region. Since the FDTD method is a time domain solver, the fields originated from the MoM region that excite the FDTD region need to be converted into time domain waveforms. Therefore, an algorithm is developed to construct time waveforms which include the desired frequencies of solution with the required magnitudes and phases in their frequency spectrums. The steady-state solution for the interaction between the MoM and FDTD regions is obtained through an iterative procedure by solving each region due to the excitations from the opposing regions in each iteration until a stopping criterion, that indicates the convergence of the global solution, is achieved. The most prominent feature of this technique is the combination of MoM simulations at multiple frequencies with single FDTD simulations by constructing broadband excitation waveforms. Furthermore, considerable reduction in the memory storage requirements and computation time can be achieved especially with larger separation between regions.

Mankind has always desired to explore space and bring the solar system within the sphere of his economic influence. This dream that technology will one day allow us to explore our solar system is now becoming a reality. Man has launched satellites and space shuttles all over the solar system and beyond. To communicate with these man-made structures, we rely on high-gain deep-space antenna technology. This advanced technology is rapidly improving and in the recent years, a new generation of antennas has emerged for space communications known as reflectarray/transmitarray.
Deep-space communications requires antennas that can achieve a very high-gain, and to satisfy this requirement most antennas deployed in space have been reflectors or lenses. The common drawback of these antennas however is typically their large volume, mass, and cost. Microstrip array antennas provide an alternative option with lower cost; however they typically cannot achieve very high gains due to their feed network distribution losses. In recent years, microstrip reflectarray and transmitarray antennas have slowly emerged as the new generation of high-gain antennas, which combine many favorable features of reflectors, lenses and printed arrays. This new generation of high-gain antenna is low-profile, low-mass and low-cost, and therefore more suitable for deployment particularly for space applications.
Reflectarray antennas are similar in principal to parabolic reflectors, while the bulky curved surface of the parabolic reflector is replaced with a planar antenna array. Similarly, a transmitarray antenna is analogous to a lens antenna, where the bulky curved lens surface is replaced with a planar antenna array. These planar array configurations can be folded into small package designs that are easy to deploy and assemble in space. In addition to the desirable mechanical features for space applications, the most prominent feature of these antennas is the direct control of the phase of each element in the array. This unique feature can be utilized to achieve shaped or multiple beams with no additional cost, which is ideally desirable for many space antennas. In this work, the advantages and recent developments of reflectarray and transmitarray antennas for space applications will be reviewed. Several high-gain Ku- and Ka-band reflectarray and transmitarray antenna designs will be presented. Also prototypes demonstrating symmetric and asymmetric multi-beams, illustrating the beam-shaping capability of these arrays will be presented. Furthermore, recent developments in high-gain THz reflectarrays and transmitarrays will also be reviewed, and new dielectric type arrays utilizing an advanced 3-D fabrication technology will be demonstrated.

1) Dual Polarized Wide Band Antenna Fed by Triplate Line for Celluar Base Stations
Wide band antenna elements consisting of a loop slot and double layered parasitic patches are designed for the cellular base station antennas to cover the frequency band of 698 to 960MHz. This antenna is excited by triplate transmission line, eliminating feeding coaxial cables and connectors inside base station antenna. This talk describes the design of this antenna element and array characteristics.
2) Low-Profile and High-Isolation Orthogonal Dual-Polarization Combined Antenna
A pair of small and low-profile dual-polarization antennas is proposed. Each composite antenna consists of a vertical and a horizontal polarized component element. The two component elements operate at the 2GHz band of IMT-2000,To extend the frequency band width of the horizontal polarization element placed near the ground plane, we use double parasitic strips to obtain dual-band characteristics to cover the uplink and downlink separately. The proposed antennas have been designed to to have a compact and low profile structure with a high isolation.
3) A Closely Spaced Switched Beam Antenna
This talk presents a switched beam antenna consisting of closely spaced two monopoles fed by its optimum amplitude and phase condition to obtain high gain in end-fire direction. The large mutual coupling is reduced by a decoupling circuit, and then a cardioid pattern is switched by selecting feeding port. The decoupling circuit is also replaced by a capacitor to keep the same network condition. This talk also discusses the super-directive condition of this array.

In this talk, the recent important progress of my research group will be discussed. The functional fibrous materials based on the polymers and silks with the functions of structural colors, fluorescence, energy storage and conversion are focused in our discussion. Such materials are fabricated through the simple techniques, such as eletrospining, chemical deposition, colloidal assembly, etc. Furthermore, the applications of above-mentioned materials in the area of biomaterials, smart textiles, and energy conversion devices are demonstrated. Our work provides new insight into the functional fibers, in particular the natural silk fibers, and their potential applications in many cutting-edge areas.

For multi-mode multi-band communication, devices with low loss and small size are required which can be implemented by MEMS technology. In this talk, multi-resonance antenna, FBAR filter, and MEMS switch are addressed for a reconfigurable transceiver operating at 2-6GHz mobile WiMAX and WLAN applications. For a multi-resonance antenna, parasitic coupler structure is used to reduce coupling effect from leakage current between adjacent antennas. FBAR filter based on AlN piezoelectric medium is described in ladder topology with seven resonators. A silicon based SP4T MEMS switch is also described with wafer level packaging by silicon-glass eutectic bonding.

Modal analysis is widely used in the fields of electromagnetics. As the preoccupation of the previous researchers, modal analysis has been successfully applied to determine the natural resonances and mode shapes of conducting enclosures such as waveguides and resonators. However, most of the relevant research is system-specific, which have less generality and limited applications.We present a generalized analysis which is based on a modal expansion framework for the investigation of arbitrary 3-D bounded and unbounded electromagnetic fields. When an inhomogeneity is enclosed with impenetrable boundaries, the field excited by arbitrary sources is expanded with a complete set of system eigenmodes (natural modes), which are classified into trapped modes and exterior (radiation) modes. As the boundaries tend to infinity, trapped modes remain unchanged, while radiation modes form a continuum. To illustrate the theory, several real-life structures are investigated with a conformal finite-difference discretization in the frequency domain. Other efficient numerical technique, such as finite-element method, finite volume method and finite integral technique can be incorporated in this framework. Perfectly matched layers (PMLs) are imposed at finite extent to emulate the unbounded problems. Numerical examples show that, only a few system trapped modes are prominent in expanding an excited field, leading to a reduced modal picture which provides a quick guidance as well as useful physical insight for engineering design and optimization of electromagnetic devices and components. This study also plays an important role in the field where modern physics is involved, such as quantum optics and Casimir interactions. Efficient mode solvers are crucial to the modal expansion analysis. When solving for cavity natural resonances, a null-space shift approach is used for the Krylov-subspace based Arnoldi solver, while a fast cosine/sine transform based preconditioner is applied for the shift-invert scheme. A differential forms motivated discretization is proposed for the finite element analysis of waveguide dispersion relations where only transverse fields are involved in the variational expressions. When natural mode analysis is formulated in an equivalent integral equation expression, resonant frequencies need to be sought for on the complex plane when the determinant of the impedance matrix becomes zero. This differs from the characteristic mode analysis (CMA), which forms a generalized eigenvalue problem using the real and imaginary parts of the impedance matrix at certain given frequencies. Although both natural modes and characteristic modes are useful engineering tools, the latter have no physical correspondence in the real life.

Electromagnetic Compatibility (EMC), electromagnetic interference (EMI), signal integrity (SI), and power integrity (PI) are essential modeling and optimization processes in today’s electronic system design and optimizations, especially for IC, packaging, and PCBs. They need both circuit theories and computational electromagnetics (CEM) to help with the specification characterization and noise diagnosis. Because reliable and efficient CEM technologies can generate fundamental physical models for these analyses, CEM methodologies are facing surging demands for their capabilities and capacities. Their accuracy, speed, convergence, bandwidth, and flexibility have serious impacts over today’s product level designs. Meanwhile, the concurrent multi-physics performance evaluation also emerged as an attractive issue, especially for the novel 3D integration technologies. This talk will focus on CEM algorithms for the modeling of EMC/EMI and SI/PI. We will introduce some efforts we have made over years to address the aforementioned challenges. Both frequency domain method and time domain method will be introduced from the physical modeling point of view. A category of fast multipole algorithms (FMA), especially the stratified medium parasitic parameter extraction based on fast multipole algorithms will be introduced. To solve the hybrid simulation of lumped components with parasitic structures, the integration of discontinuous Galerkin’s time domain method with the modified modal analysis is introduced. On top of theoretical discussions, certain engineering type front end for on-chip and packaging analysis will be introduced to entertain audiences.

In this presentation, we introduce a planar plasmonic metamaterial on thin metal films with nearly zero thickness. From the theoretical simulations and experiments, we show that spoof SPPs can propagate along a thin metal film by corrugating its edge with periodic array of grooves. Such a planar plasmonic metamaterial can sustain highly localized SPPs along two orthogonal directions in the terahertz and microwave regions in broadband by keeping good modal shape and propagating long distance with low bending loss. The ability to bend spoof SPPs freely on thin film makes the planar plasmonic metamaterial more practical to produce plasmonic devices in the terahertz frequency, such as bends, splitters, filters, polarizers, and resonators. Experiments in the microwave frequency validate the feasibility of planar plasmonic metamaterial. Based on the above idea, we also present the concept of conformal surface plasmons (CSPs), i.e., the surface plasmon waves that can propagate on ultrathin and flexible films to long distances. The flexible ultrathin films can be bent, folded, and even twisted to mould the flow of CSPs.
We will also propose and experimentally demonstrate spoof localized surface plasmons (LSPs) on a planar textured metallic disk at the microwave frequencies. We design and realize the plasmonic metamaterial using ultrathin metal film printed on a thin dielectric substrate and observe the multipolar plasmonic resonances in both numerical simulations and experiments, including the dipole, quadrupole, hexapole, octopole, decapole, dodeca-pole, and quattuordec-pole modes. The simulation and experiment results have very good agreements. We show that the spoof LSP resonances are sensitive to the disk’s geometry and local dielectric environments, and hence the ultrathin textured metallic disk has potential applications as plasmonic sensor in the microwave and terahertz frequencies.We will also present an efficient conversion between the conventional guided waves and the SPP modes. Based on the conversion and spoof SPP/LSP devices, we proposed integrated spoof SPP/LSP circuits to realize a series of functionalities, and give experimental demonstration.

Eddy current nondestructive evaluation (NDE) of airframe structures involves the detection of electromagnetic field irregularities due to non-conducting inhomogeneities in an electrically conducting material, which often treats with complicated geometrical features such as cracks, fasteners, sharp corners/edges, multi-layered structures, etc. The eddy-current problem can be formulated by the boundary integral equations (BIE) and discretized into matrix equations by the method of moments (MoM) or the boundary element method (BEM). This paper introduces the implementation of Stratton-Chu formulation for the conductive medium, in which the induced electric and magnetic surface currents are expanded in terms of Rao-Wilton-Glisson (RWG) vector basis function and the normal component of magnetic field is expanded in terms of pulse basis function. Also, a low frequency approximation is applied in the external medium, that is, free space in our case. Computational tests are presented to demonstrate the accuracy and capability of the BIE method with a complex wave number for three-dimensional objects described by a number of triangular patches. This work prepares the BIE solution procedure that will be embedded with the Fast Multipole Method (FMM), which is a well-established and effective method for accelerating numerical solutions of the matrix equations. When accelerated by the FMM, the BIE method will have the capability of solving large-scale electromagnetic wave propagation and eddy-current problems. We also developed a novel boundary integral equation for eddy-current nondestructive evaluation problems with surface crack under a uniform applied magnetic field. Once the field and its normal derivative are obtained for the structure in the absence of cracks, normal derivative of scattered field on the conductor surface can be calculated by solving this equation with the aid of method of moments. This equation is more efficient than conventional BIEs because of a smaller computational domain needed.

Metamaterials such as left-handed materials (LHMs), where both permittivity and permeability are negative, have attracted great attention due to their novel and unique electromagnetic properties. The metamaterials have potential applications such as radio frequency and microwave device miniaturization. Because excited complex surface modes have slowly exponential decaying fields on the air-slab interface, the directivity for dipoles over a grounded metamaterial slab is much higher than directivity with conventional double positive materials. In this presentation, I will talk the investigation of leaky waves and their excitation with multilayered metamaterials to enhance antenna performance: wave propagation along a grounded dielectric slab with double negative (DNG) materials, complex waves (leaky waves) changes with different material parameters, electric size (frequency and thickness) and loss, Sommerfeld integral path for evaluating fields accurately and efficiently, the radiation intensity and directivity of electric/magnetic dipoles over a grounded slab, and optimization of the directivity over the thickness and the constitutive parameters for antenna applications. I will also talk designing and making low-loss dielectric metamaterials at Iowa State University.

Since 2006 Delft University of Technology (TU Delft), The Netherlands, collaborated with a number of Indonesian organizations in development of FMCW maritime radar. The collaboration resulted in the birth of the first Indonesian maritime radar, named INDERA, in 2009. At the same year the radar obtained a domestic certification from the Indonesian government and came into production in 2010. Currently, a number of the radars have been produced and are operational onboard the vessels of the Indonesian maritime authority.INDERA radars are naval LPI (low probability of intercept) radars which operate in the X-band and are optimized for detection of targets on the sea surface. The features of these radars include: naval LPI radar, solid-state FMCW technology, 5 W max. transmit power, frequency agility, ARPA functionality, integrated electronic chart ECDIS S-57, integrated AIS, GPS and compass, stand-alone navigation capability, adaptive CFAR and Doppler FFT processing. At present, development of the next-generation INDERA radars is ongoing with focus on software-defined radar (SDR) implementation and hardware miniaturization.In this talk the development of the INDERA radar will be described, including its global design, experimental results and implementation. Furthermore, the SDR concept of its next-generation version will also be discussed.

Interest in metamaterials and their applications has taken an explosive growth. The potential take-up of these structures in communication and sensing systems is primarily due to the control of the amplitudes, frequencies and wave-numbers of propagating and non-propagating electromagnetic modes to an extent that was not previously possible. The control of electromagnetic waves can be applied in various application fields such as, indoor and outdoor communication systems, communicating mobile objects, transport systems (cruise liners and high-speed trains), space/earth communication and microelectronics at µ-wave and mm-wave frequencies.
Frequency Selective Surfaces (FSSs), Electromagnetic Bang Gap (EBG) and Artificial Magnetic Conductor (AMC) structures are all periodic arrays and forms of metamaterials. Metamaterials are, in essence, the materials of the future, since the main purpose for their study is to be able to go beyond where naturally occurring substances and current material structures research have taken us. By combining different microscopic elements into large-scale designs, one will be able not only to create materials with fundamentally new properties but also to fabricate others that have properties on demand, as required by new technologies. The above description of advantageous properties of metamaterials gives a small insight into the large potential industrial application of these concepts. An overview of the work spanning over two decades in FSSs, EBGs and AMCs of the Wireless Communications Research Group at Loughborough University, UK will be presented.

Interest in metamaterials and their applications has taken an explosive growth. The potential take-up of these structures in communication and sensing systems is primarily due to the control of the amplitudes, frequencies and wave-numbers of propagating and non-propagating electromagnetic modes to an extent that was not previously possible. The control of electromagnetic waves can be applied in various application fields such as, indoor and outdoor communication systems, communicating mobile objects, transport systems (cruise liners and high-speed trains), space/earth communication and microelectronics at µ-wave and mm-wave frequencies.
Frequency Selective Surfaces (FSSs), Electromagnetic Bang Gap (EBG) and Artificial Magnetic Conductor (AMC) structures are all periodic arrays and forms of metamaterials. Metamaterials are, in essence, the materials of the future, since the main purpose for their study is to be able to go beyond where naturally occurring substances and current material structures research have taken us. By combining different microscopic elements into large-scale designs, one will be able not only to create materials with fundamentally new properties but also to fabricate others that have properties on demand, as required by new technologies. The above description of advantageous properties of metamaterials gives a small insight into the large potential industrial application of these concepts. An overview of the work spanning over two decades in FSSs, EBGs and AMCs of the Wireless Communications Research Group at Loughborough University, UK will be presented.

With the rapid development of wireless communication system, it is very important to demand that base-station antennas can cover a wider frequency range and accommodate to more communication standards so as to avoid the repetitive construction of telecom equipment. Dual-polarized base-station antennas have been widely applied to combat multipath propagation effects and to enhance the signal reception quality in modern mobile communication systems. In the wider operation frequency range, the base-station antennas should achieve not only lower VSWR, but also stable beam-width and lower cross -polarization ratio in wider sight. In this talk, a novel approach to design wideband antennas with stable radiation patterns is presented. By paralleling a pair of dipoles over a big reflector, the stable radiation patterns can be achieved. According to the proposed method, antennas for LTE base-station have been designed with VSWR<1.5 and half-power beamwidth is 64±3 degree from 1.71GHz to 2.69GHz. Meanwhile, a novel method is also presented to improve the cross-polarization ratio of a broadband ±45º dual-polarized base-station antenna within ±60º of the main lobe at the horizontal plane. According to the proposed method, four parasitic elements are added around a simple antenna, leading a novel dual-polarized antenna for LTE base station, its XPD is increased about 15 dB at ±60º at the center frequency. 

The objective of this presentation is to present the research progress of millimeter-wave and terahertz vector network analyzer in China. It introduces about the implementation scheme of vector network analyzer, and introduces the solutions of electromagnetic material test system, antenna test system and radar cross section (RCS) test system. It mainly  introduces about the research progress of multiplier, harmonic mixer, detector, directional coupler, matching load and attenuator in millimeter-wave and terahertz frequency. The technical problems urgent to farther resolve are analyzed, and the future development directions and application realms are discussed.

Advancements in wireless communication demand RF/microwave filters with more compact size, higher performance and lower cost. Introduction of finite transmission zeros in quasi-elliptical filters can reduce the number of resonators required to meet the more rigorous specification and this, in turn, reduces the insertion loss and manufacturing cost. Source–load coupling or cross-coupling approaches are often adopted to generate additional transmission zeros. In this talk, a novel method to generate transmission zeros is proposed through controlling mixed electric and magnetic coupling between two cascaded resonators without any cross-coupling. Novel microstrip, coaxial and dielectric resonator filters with this coupling mechanism are given to demonstrate the advantages of the proposed method. Simulation and measurement results illustrate that generated transmission zeros are adjustable, the filters have smaller resonators number, small insert loss, higher rejection level as well as asymmetrical responses.

In this presentation, we will introduce our R&D work in the Ka-band communication and radar system including RF components, RF frontend and baseband.

The objective of this presentation is to present an evaluation of the electromagnetic fields (EMFs) in complex biological and artificial structures. With the expansion of current research interests and anticipated further increases in the use of wireless charging systems by inductive power transfer for electric vehicles, it is important to dedicate research efforts to calculate the induced EMFs in the human body such that the compliance of this charging system with respect to human electromagnetic exposure limits can be examined. Systematic modeling and computational technology will be introduced. Then, due to the fact that fiber-based multilayered composite materials are increasingly encountered in both aeronautic and automotive industries, we will discuss a fast algorithm to calculate the EM scattering in such composite materials.

In this talk, we review recent progress on nonreciprocal CRLH metamaterials with nonreciprocal refractive indices and their applications to antennas. The nonreciprocal CRLH metamaterials show positive and negative refractive indices at the same frequency, selection of which depends on the transmitted power direction. Traveling wave resonators with variable size and phase gradient of the field profile can be designed for a given frequency. In addition, beam-scanning antenna with the externally applied dc magnetic field is demonstrated based on the traveling wave resonators showing high radiation efficiency and small beam squint, compared to conventional leaky wave antennas.

In recent years, metamaterials have been considered for enhancing the performance of antennas or for obtaining characteristics that are not easily attainable otherwise. Among them are the EBG structures with special properties that are required to form EBG resonator antennas (or Fabry-Perot Resonator Antennas). Such antennas have the advantages of low planar profile, high directivity and low cost of production. The main resonator in such an antenna is an air cavity, which is bounded by two surfaces. One of the surfaces is either a fully reflecting electric conductor or a fully reflecting artificial magnetic conductor (AMC). The other surface is usually formed by a strongly but partially reflecting EBG structure. 1-D, 2-D and 3-D EBG structures have been considered for this purpose. In this talk, the design principles on high-gain, low-profile, wideband and dual-band Fabry-Perot resonator antennas (or EBG resonator antennas) will be discussed.

This presentation will discuss various interaction mechanisms between artificial EM fields and the human body, including the associated biological effects, spanning from low-frequency to radio-frequency applications. Focus will be placed on the state-of-art measurement (e.g., probe, phantom) and numerical techniques (solvers, high-resolution human body models) developed for specific bioelectromagnetic analysis. Representative applications in MRI safety, hyperthermia treatment and implantable device are discussed in greater details.