A waveguide mode-converter feed for a 5-W, 34-GHz grid amplifier

Author

Chun-Tung Cheung ; Hacker, J.B. ; Nagy, G. ; Rutledge, D.B.

Author_Institution

California Inst. of Technol., Pasadena, CA, USA

Volume

3

fYear

2002

fDate

2-7 June 2002

Firstpage

1523

Abstract

We have demonstrated a compact waveguide mode converter that excites a combination of TE/sub 10/ and TE/sub 30/ modes for feeding a grid amplifier. The length of the mode converter is only 13 mm. The effective transmitter power (ETP) at 34 GHz is 5 W, with a gain of 5.5 dB and a power-added efficiency (PAE) of 21%. The supply voltage is 3 V, with a bias current of 5.6 A. These results are comparable to those reported earlier for the same grid-amplifier design measured in free space. A spurious oscillation with a broad radiation pattern was observed at 33.6 GHz with an effective isotropic radiated power (EIRP) of 23 mW. This oscillation was suppressed when the grid was operating at high power levels, and disappeared entirely at output powers above 4.5 W.

Keywords

millimetre wave amplifiers; waveguide components; 13 mm; 21 percent; 3 V; 34 GHz; 5 W; 5.5 dB; 5.6 A; effective isotropic radiated power; effective transmitter power; gain; grid amplifier; power added efficiency; quasi-optical amplifier; radiation pattern; spurious oscillation; waveguide mode converter feed; Circuits; Extraterrestrial measurements; Feeds; Millimeter wave measurements; Minimization; Power amplifiers; Power generation; Rectangular waveguides; Thermal conductivity; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2002 IEEE MTT-S International

Conference_Location

Seattle, WA, USA

ISSN

0149-645X

Print_ISBN

0-7803-7239-5

Type

conf

DOI

10.1109/MWSYM.2002.1012145

Filename

1012145