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A Study on Design and Fabrication of High Isolation W-band MIMIC Single-balanced Mixer  

Yi, Sang-Yong (ADD)
Lee, Mun-Kyo (Millimeter-wave INnovation Technology research center, Dongguk University)
An, Dan (DAPA)
Lee, Bok-Hyung (Sam-sung Thales)
Lim, Byeong-Ok (Millimeter-wave INnovation Technology research center, Dongguk University)
Rhee, Jin-Koo (Millimeter-wave INnovation Technology research center, Dongguk University)
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Abstract
In this paper, a high LO-RF isolation W-band MIMIC single-balanced mixer was designed and fabricated using a branch line coupler and a ${\lambda}/4$ transmission line. The W-band MIMIC single-balanced mixer was designed using the $0.1\;{\mu}m$ InGaAs/InAlAs/GaAs Metamorphic HEMT diode. The fabricated MHEMT was obtained the cut-off frequency($f_T$) of 154 GHz and the maximum oscillation frequency($f_{max}$) of 454 GHz. The designed MIMIC single-balanced mixer was fabricated using $0.1\;{\mu}m$ MHEMT MIMIC process. From the measurement, the conversion loss of the single-balanced mixer was 12.8 dB at an LO power of 8.6 dBm. P1 dB(1 dB compression point) of input and output were 5 dBm and -8.9 dBm, respectively. The LO-RF isolations of single-balanced mixer was obtained 37.2 dB at 94 GHz. We obtained in this study a higher LO-RF isolation compared to some other balanced mixers in millimeter-wave frequencies.
Keywords
Single-balanced mixer; MIMIC; MHEMT; Balun; High Isolation;
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