Design of double-balanced MMIC mixer for Ka-band satellite communications

Keun Kwan Ryu, Dong Phil Jang, Moon Que Lee, In Bok Yom, Seong Pal Lee

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


A MMIC (monolithic microwave integrated circuit) mixer chip using the Schottky diode of an InGaAs/GaAs p-HEMT process has been developed to act as the receiver down converter of a Ka-band satellite transponder. A different approach to the MMIC mixer structure is applied for reducing the chip size by the exchange of ports between IF and LO. This MMIC covers with RF (30.6-31.0 GHz) and IF (20.8-21.2 GHz.) According to the on-wafer measurement, the miniature (3.0 × 1.5 mm) MMIC mixer demonstrates conversion loss below 7.8 dB, LO-to-RF isolation above 27 dB, LO-to-IF isolation above 19 dB, and RF-to-IF isolation above 40 dB, respectively.

Original languageEnglish
Pages (from-to)401-403
Number of pages3
JournalMicrowave and Optical Technology Letters
Issue number6
StatePublished - 20 Sep 2002


  • Double-balanced mixer
  • Ka-band transponder
  • MMIC


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