A balanced single side-band (SSB) mixer employing a sub-harmonic configuration is designed for up and down conversions in K-band. The designed mixer uses anti-parallel diode (APD) pairs to effectively eliminate even harmonics of the local oscillator (LO) spurious signal. To reduce the odd harmonics of LO at the RF port, we employ a balanced configuration for LO. The fabricated chip shows 12$\pm$2dB of conversion loss and image-rejection ratio of about 20dB for down conversion at RF frequencies of 24-27.5GHz. As an up-conversion mode, the designed chip shows 12dB of conversion loss and image-rejection ratio of 20 ～ 25 dB at RF frequencies of 25 to 27GHz. The odd harmonics of the LO are measured below -37dBc.
H. Okazaki, and Y. Yamaguchi, 'Wide-band SSB subharmonically pumped mixer MMIC,' IEEE Trans. Microwave Theory & Tech., vol. 45, no. 12, pp. 2375-2379, December 1997
S. A. Maas, Microwave Mixers, 2nd ed. Norwood, MA: Artech House, 1993, pp. 280–283
H.I. Fujishiro, Y. Ogawa, T. Hamada, and T. Kimura, 'SSB MMIC mixer with subharmonic LO and CPW circuit for 38GHz band applications,' IEE Electron Letters, vol. 37, no. 7, pp. 435-436, March 2001
M. Cohn, J. E. Degenford, and B. A. Newman, 'Harmonic mixing with an antiparallel diode pair,' IEEE Trans. Microwave Theory Tech., vol. MTT-23, pp. 667–673, 1975
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Lee, Moon-Que 2006. "Miniaturized Balun with Reduced Coupled-Line and its Application to the Design of Balanced-Type Filter" 전기학회논문지. The transactions of the Korean Institute of Electrical Engineers. C/ C, 전기물성·응용부문, 55(4): 217~222