V-band Microstrip Integrated Harmonic Mixer

The super-heterodyne receiver is always applied in modern communication system, so mixer becomes the key part. However, it is more and more difficult to achieve the LO source of the same band with the system is working at higher and higher frequency. Sub-harmonic mixer solved it efficiently. The frequency of LO is only equal to half,quarter and even 1/8……of that of RF input signal. The design and fabrication of sub-harmonic microstrip mixer (2X and 4X) in V band was introduced in the paper. The core component of the mixer is an anti-parallel diode pair from Alpha. Mixer circuit mostly include BPF, LPF, port match network and open/short-ended. The process of develop consisted of computer aided design and simulation/optimization, fabrication of microstrip circuit and cavity and test. According to the test result ,the conversion loss of the 2X and 4X SH mixer is 9.3 dB and 20 dB.