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Low Conversion Loss and High Isolation 94 GHz MHEMT Mixer Using Micro-machined Ring Coupler  

An Dan (Millimeter-wave INnovation Technology research center)
Kim Sung-Chan (Millimeter-wave INnovation Technology research center)
Park Jung-Dong (Agency for Defense Development)
Lee Mun-Kyo (Millimeter-wave INnovation Technology research center)
Lee Bok-Hyung (Millimeter-wave INnovation Technology research center)
Park Hyun-Chang (Millimeter-wave INnovation Technology research center)
Shin Dong-Hoong (Millimeter-wave INnovation Technology research center)
Rhee Jin-Koo (Millimeter-wave INnovation Technology research center)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.6, 2006 , pp. 46-52 More about this Journal
Abstract
We report on a high performance 94 GHz MMIC resistive mixer using 70-nm metamorphic high electron mobility transistor (MHEMT) and micro-machined W-band ring coupler. A novel 3-dimensional structure of resistive mixer was proposed in this work, and the ring coupler with the surface micro-machined dielectric-supported air-gap microstrip line (DAMLs) structure was used for high LO-RF isolation. The fabricated mixer showed an excellent LO-RF isolation of -29.3 dB and a low conversion loss of 8.9 dB at 94 GHz. To our knowledge, compared to previously reported W-band mixers, the proposed MHEMT-based resistive mixer using micro-machined ring coupler has shown superior LO-RF isolation as well as similar conversion loss.
Keywords
resistive mixer; micro-machined ring coupler; LO-RF isolation;
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