Title :
FET-based planar circuits for quasi-optical sources and transceivers
Author :
Birkeland, Joel ; Itoh, Tasuo
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA
fDate :
9/1/1989 12:00:00 AM
Abstract :
The circuits that are simple in construction and exhibit isotropic conversion gain are discussed. Both single-device and balanced transmitter and transceiver circuits are described. Balanced sources are presented that can be operated in push-pull mode for frequency doubling. A single-FET quasi-optical oscillator circuit using a microstrip patch linear array and having an effective radiated power of 31.6 dBm at 10 GHz is reported. A dual-FET frequency-doubling oscillator circuit using a coupled rampart line antenna with an effective radiated power of 21.6 dBm at 19.7 GHz is also described. Quasi-optical transceiver elements are presented that use the FETs as both signal sources and self-oscillating mixers for down-conversion of the received signal. The application of these transceiver elements to Doppler motion detection is reported
Keywords :
Schottky gate field effect transistors; field effect transistor circuits; microwave oscillators; mixers (circuits); solid-state microwave circuits; strip line components; transceivers; transmitters; 10 GHz; 19.7 GHz; Doppler motion detection; FET-based planar circuits; MESFET; SHF; balanced transmitter; down-conversion; dual FET configuration; frequency doubling; isotropic conversion gain; microstrip patch linear array; microwave circuits; oscillator circuit; push-pull mode; quasi-optical sources; quasioptical transceiver; self-oscillating mixers; single FET configuration; Coupling circuits; FETs; Frequency; Linear antenna arrays; Microstrip antenna arrays; Microwave circuits; Motion detection; Oscillators; RLC circuits; Transceivers;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
