|
|
|
|
Reconfigurable Active Duplexer for Wireless Systems There is a growing interest in tunable or reconfigurable microwave circuits for applications in wireless systems. A duplexer is a critical component in the functioning of a wireless transceiver. It allows simultaneous transmission and reception of signals from a single antenna. The duplexers currently used in transceivers are passive circuits (bandpass filters) and hence have insertion loss. Further, they are not tunable. A distributed amplifier is inherently bi-directional because of the symmetry in its architecture. By incorporating tunable phase shifting networks in a distributed amplifier it can function as a reconfigurable active duplexer. In this presentation a novel electronically tunable active duplexer suitable for reconfigurable wireless transceiver applications will be presented for the first time. The theory, design, and measured results of a varactor tunable active duplexer will be presented. The prototype active duplexer provides an electronically adjustable isolation of 20 to 50 dB between isolated ports and a constant gain of 5 dB between coupled ports in the tunable range from 1.62 to 1.82 GHz in both transmit and receive modes of operations. The design guidelines as well as measured S-parameters of the duplexer will be presented. The proposed duplexer can be easily implemented as an MMIC. |
Send mail to
aryanfar@ieee.org with
questions or comments about this web site.
|