|
|
EMCABS
SHORTCUT TO HARMONIZATION WITH AUSTRALIAN SPECTRUM
LICENSING Abstract: Spectrum Licensing, as opposed to
equipment standardization, is described in the framework of the
Australian program for spectrum management. It provides for flexibility
to avoid the problem of picking technology winners while also
providing for certainty for the operation of equipment. Properly
handled, the process gets government out of the loop for most
of spectrum management. Managing in-band and out-of-band interference
is discussed along with practical examples of spectrum licensing.
Deployment constraints are avoided by using guard space along
the area and frequency boundaries of licenses. The mutual recognition
agreements (MRAs) including recognition of conformity assessments
play important roles in the process.
EMCABS: 02-5-2003
Abstract: This paper describes a Power
Factor Correction (PFC) circuit for a single-phase boost type
ac-to-dc converter that forces the input current to be sinusoidal
and in phase with the input voltage. The circuit operates at a
constant switching frequency in continuous conduction mode and
improves the dynamic response of the output voltage. Lower conducted
noise results from a smoother input current. A double injection
method is used in the circuit to lower the total harmonic distortion
to 1.96% and produce a PF of 0.999 as measured on a prototype.
Abstract: A time-domain approach, which
combines the FDTD method and the multi-conductor layer peeling
technique (MLPT), is proposed for extracting the SPICE-compatible
models of high-speed coupled interconnects. Based on a dynamic
deconvolution algorithm of the MLPT for the time-domain scattered
data, the equivalent models of the interconnects can be synthesized
by cascading several uniform piecewise coupled transmission line
systems. Two examples are used to demonstrate the validity of
the proposed approach. One is the differential pair crossing an
imperfect ground with a slit. The other is the crosstalk behavior
prediction for a three-coupled strip lines structure. Good agreement
between our approach and measurement will be seen.
EMCABS: 04-5-2003
Abstract: With a fast algorithm based
on the full cavity-mode resonator model and the segmentation method,
power bus resonance characteristics of a gapped power-plane with
a slit is studied. An inductance model, where the inductance is
determined by treating the slit as a shorted coplanar strip-line,
is used for taking into account the field coupling between the
two adjacent edges of the gapped plane. Good agreements between
the calculated and measured results have demonstrated the usefulness
and accuracy of our fast algorithm and the segmentation method,
as well as the inductance model for the slit.
Abstract: A novel concept for an electric-field
(E-field) probe is proposed. The reactive near field, induced
by an impinging E-field, of a very short, short-circuited receiving
dipole is measured with the aid of an electro-optical modulator.
The modulator is designed as a Fabry-Perot etalon. The laser light
guided in the etalon is modulated proportionally to the near field
of the antenna. The advantage of the etalon is to considerably
increase the sensitivity of the probe compared to known electro-optic
probes. It is shown analytically, for an ellipsoidal dipole, that
only the electrostatic terms of the dipole field are relevant.
The advantage of using a dipole much shorter than the wavelength
is to minimize the interaction of the probe with the environment
and the impinging electromagnetic (EM) field. Very important is
the optimal choice of the material of the modulator. Since the
linear electro-optical effect is used, best results are achieved
if the index ellipsoid of the material parameters does not rotate
under the influence of an external field but only varies its size.
Such behavior is found in materials as e.g. LiNbO3, and poled
polymers. Because of reflections, a second parameter of concern
is the permittivity of the modulator base material. Its value
should be as close as possible to the permittivity of the environment.
Therefore, polymers are the most promising materials known today
for this kind of probe.
EMCABS: 06-5-2003
Abstract: This paper presents the analysis
of EMI radiation (far-field) from a shielded cable installed inside
a PCB sub-rack. The simulation analysis includes two main parts,
the EMI leakage penetrating through a cable shield and the 3D
full wave simulation of EMI radiation of the cable inside the
sub-rack. FDTD method has been employed to perform the simulation
analysis. The thin wire model implemented with the FDTD code is
evaluated for the application to model the signal cables. Moreover,
the simulated results have been validated through the comparison
to measurement. The results show that the simulation method is
applicable for EMC design of telecom products associated with
EMI radiation from shielded cable assemblies.
EMCABS: 07-5-2003
EMCABS: 08-5-2003 Abstract: A four-septum TEM cell with
a balanced transmission line structure is developed. The four
septa, x-direction pair and y-direction pair, are symmetrically
arranged within the outer conductor. These two pairs of septa
are excited separately and differently, thus radiated immunity
characteristics of equipment under test (EUT) under an arbitrary
specific polarization can be measured without rearranging the
test setup. A prototype of the four-septum TEM cell is designed
and developed, and its performance is examined numerically and
experimentally.
EMCABS: 09-5-2003
Abstract: This paper deals with statistical
properties of scattering parameters of a quadripole in a mechanical
mode stirred chamber. We noticed experimentally that the mean
value (over a complete rotation of the stirrer) of any object
(antennas, cables, equipment) reflection coefficient was similar
to their reflection coefficient measured in free space. Moreover,
variances of quadripole scattering parameters are linked by a
non-obvious remarkable relationship. These characteristics, put
to the fore in various experimental configurations, can be explained
thanks to a theoretical analysis based on multipole systems. An
application of these characteristics is very interesting in order
to evaluate the efficiency of a reverberating chamber and in order
to optimize equipment susceptibility experimentation.
EMCABS: 10-5-2003
Abstract: A basic problem of complex
systems with several subsystems is to predict the overall radiated
emission behavior. An appropriate way to solve this problem is
to superpose the radiation patterns of subsystems. In this article
a method is provided to determine an emission model for near and
far field. The model is based upon the multipole expansion. All
input parameters of the model are obtained by near field measurements.
The applied correlation method is a novel approach for complex
near field measurement in EMC and does not necessarily require
cost intensive measurement instruments. Near field measurements
using the correlation method are first presented for a monopole
DUT. Results are compared with a radiated field simulation of
an ideal monopole. Afterwards, measurement results are used to
determine the multipole expansion for the realistic monopole.
The obtained model and radiation pattern is compared to the multipole
expansion and radiation pattern of the ideal DUT. Second, a simplified
PCB is presented. The simulated radiated field of its multipole
model is compared to measurements.
Abstract: This paper deals with the measurement
of integrated circuit (IC) radiated emissions. In particular,
a new technique for the evaluation of radiated electromagnetic
(EM) emissions delivered by an IC is presented. Such a technique
is based on the use of a specific four-layer test board which
the device under test (DUT) is mounted on. In particular, the
current flowing in each IC terminal is routed through a via-hole,
which excites a waveguide integrated into a test board. The paper
shows, by some experimental test results, that the overall power
delivered to the terminations of such a waveguide is related to
the power radiated by the same DUT into a TEM cell.
EMCABS: 12-5-2003
Abstract: This paper presents a method
for the analysis of the electromagnetic field inside a metallic
enclosure with feed through slots on its walls. The model is based
on a time domain approach and the solution of the electromagnetic
problem is achieved by a hybrid method, characterized by the combination
of the Finite Difference in Time Domain (FDTD), and the Method
of Moments in Time Domain (MoMTD) that solves a magnetic field
integral equation (MFIE); this technique allows one to investigate
the complex geometry of the problem and to evaluate the strong
coupling between the source and the victim structure. All simulated
results are validated by measurements.
|
|
|
If you would
like to contact the IEEE Webmaster |
 |