[2] Cohn M, Degenford J E, Newman B A. Harmonic mixing with an anti-parallel diode pair［J］. IEEE Transactions on Microwave Theory and Techniques,1975,23(8):667-673.

[7] Xu Y F. A low conversion loss millimeter wave fourth subharmonic mixer［C］. In International Conference on Microwave and Millimeter Wave Technology Proceedings,2008,2:843-845.

[8] Villegas F J, Stones D I,. Hung H A. A novel waveguide-to-microstrip transition for low-cost millimeter-wave and MMIC applications［C］. In IEEE-MTTS International Microwave Symposium Digest,1997,2:739-742.