A K-Band MMIC Subharmonically Pumped Mixer Integrating Local Oscillator Amplifier with Low Spurious Output

Yasushi SHIZUKI  Ken ONODERA  Kazuhiro ARAI  Masaaki ISHIDA  Shigeru WATANABE  

IEICE TRANSACTIONS on Electronics   Vol.E84-C    No.4    pp.433-442
Publication Date: 2001/04/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
MMIC,  subharmonically pumped mixer,  anti-parallel diode pair,  low spurious,  quasi-lumped stub,  

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A K-band MMIC subharmonically pumped mixer integrating local oscillator (LO) amplifier has been developed. For up-converter application, it is necessary to reduce the leakage of second harmonic component of LO frequency to RF port, which is generated by nonlinear operation of LO amplifier. A quasi-lumped short-circuited stub using microstrip structure has been successfully applied to the MMIC mixer to enhance 2fLO-suppression. We propose a new configuration of a quasi-lumped short-circuited stub, which reduces the influence of parasitic elements of via-holes. The developed MMIC has a one-stage LO amplifier and it has shown about 10 dB-improvement of 2fLO-suppression compared to conventional configuration using a quarter-wavelength short-circuited stub.