A Q-band miniaturized uniplanar MMIC HEMT mixer

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

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations


A miniaturized uniplanar GaAs MMIC HEMT mixer is proposed based on a compact multifunction transition structure. By the independence nature of the coplanar-wavguide (CPW) mode and the coplanar-stripline (CPS) mode, a novel 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.

Original languageEnglish
Pages (from-to)187-190
Number of pages4
JournalIEEE MTT-S International Microwave Symposium Digest
StatePublished - 2004
Event2004 IEEE MITT-S International Microwave Symposium Digest - Fort Worth, TX, United States
Duration: 6 Jun 200411 Jun 2004


  • Mixer
  • Transition
  • Uniplanar


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