Title :
HBT active antenna as a self-oscillating Doppler sensor
Author :
Kelly, M.J. ; Fusco, V.F. ; Stewart, J.A.C. ; Sancheti, S. ; Drew, S
Author_Institution :
Celeritek NI Ltd., Belfast, UK
fDate :
2/1/2000 12:00:00 AM
Abstract :
The use of a heterojunction bipolar transistor in an active antenna operating as a self-oscillating Doppler sensor is investigated. A large-signal model compatible with nonlinear-circuit-simulation CAD packages is developed and used to simulate the performance of the active antenna, including its phase-noise characteristics. The active antenna operates at 11.4 GHz with an EIRP of 11 dBm. As a self-oscillating sensor, it exhibits a minimum detectable signal relative to carrier of -99 dBm in a 10 Hz bandwidth. This gives the sensor a usable range of approximately 40 m making it useful for a variety of intruder-detection and other short-range-sensing applications
Keywords :
Doppler effect; active antennas; circuit CAD; circuit simulation; electric sensing devices; heterojunction bipolar transistors; microstrip antennas; microwave antennas; microwave oscillators; nonlinear network synthesis; 10 Hz; 11.4 GHz; HBT active antenna; bandwidth; carrier; heterojunction bipolar transistor; intruder-detection; large-signal model; microstrip HBT oscillator; minimum detectable signal; nonlinear-circuit-simulation CAD packages; patch antenna; performance simulation; phase-noise characteristics; self-oscillating Doppler sensor; short-range-sensing applications;
Journal_Title :
Microwaves, Antennas and Propagation, IEE Proceedings
DOI :
10.1049/ip-map:20000050
