A Q-band miniaturized uniplanar MMIC HEMT mixer

Author

Wang, Chi-Hsueh ; Lin, Yo-Shen ; Wang, Huei ; Chen, Chun Hsiung

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan

Volume

1

fYear

2004

fDate

6-11 June 2004

Firstpage

187

Abstract

A miniaturized uniplanar GaAs MMIC HEMT mixer is proposed based on a compact multifunction transition structure. By the independence nature of the coplanar-waveguide (CPW) mode and the coplanar-stripline (CPS) mode, a compact transition which converts the CPW mode into the CPS mode is realized. This transition structure also has the functions of 180° hybrid, RF and LO diplexer, and bandpass filter. Thus the size of the proposed mixer may be drastically reduced, and the LO-to-IF and LO-to-RF isolations and RF conversion gain are excellent. This mixer is designed to operate with RF frequency from 35 to 40 GHz, IF frequency from 0.5 to 6 GHz, and LO frequency at 35 GHz. The lower sideband conversion gain is about 5 dB, the single-sideband (SSB) noise figure is 6.5 dB, the isolations are all better than 30 dB, and the size of the mixer is much compact than those of the conventional mixers.

Keywords

HEMT integrated circuits; III-V semiconductors; MMIC mixers; coplanar waveguides; gallium arsenide; strip lines; waveguide transitions; 0.5 to 6 GHz; 35 to 40 GHz; 6.5 dB; GaAs; IF frequency; LO diplexer; LO frequency; MMIC HEMT mixer; Q-band mixer; RF conversion gain; RF diplexer; RF frequency; bandpass filter; coplanar-stripline mode; coplanar-waveguide mode; miniaturized uniplanar mixer; mode conversion; multifunction transition structure; sideband conversion gain; single-sideband noise figure; Coplanar waveguides; HEMTs; Inductors; MIM capacitors; MMICs; Radio frequency; Semiconductor diodes; Slotline; Spirals; Stripline;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2004 IEEE MTT-S International

ISSN

0149-645X

Print_ISBN

0-7803-8331-1

Type

conf

DOI

10.1109/MWSYM.2004.1335839

Filename

1335839