Title :
Quasi-optical traveling wave amplifiers
Author :
Alexanian, A. ; Huan-Shang Tsai ; York, R.A.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
Abstract :
Previously reported quasi-optical amplifier arrays have limited bandwidth and suffer from poor input/output isolation. These problems can be solved by using traveling wave antennas and distributed amplifier techniques. FDTD simulations of a linearly tapered slot array topology demonstrate very broadband quasi-optical transitions are feasible with small unit-cell aperture. Experiments using a single-element low frequency prototype exhibit a 50% fractional bandwidth at 3.5 GHz using Vivaldi-type slots and a hybrid microstrip MESFET TWA circuit.
Keywords :
aperture antennas; distributed amplifiers; finite difference time-domain analysis; microwave amplifiers; slot antenna arrays; travelling wave amplifiers; wideband amplifiers; 3.5 GHz; FDTD simulation; Vivaldi-type slots; bandwidth; broadband quasi-optical transitions; distributed amplifier; hybrid microstrip MESFET TWA circuit; input/output isolation; linearly tapered slot array; quasi-optical traveling wave amplifier array; single-element low frequency device; traveling wave antenna; unit-cell aperture; Apertures; Bandwidth; Broadband amplifiers; Circuit simulation; Circuit topology; Distributed amplifiers; Finite difference methods; Linear antenna arrays; Microstrip antenna arrays; Time domain analysis;
Conference_Titel :
Microwave Symposium Digest, 1996., IEEE MTT-S International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-3246-6
DOI :
10.1109/MWSYM.1996.511225
