MICROWAVE MIXER USING MICROSTRIP RECTANGULAR PATCH RESONATOR

In this article, design of a diode-based mixer using microstrip rectangular resonator patch is described. A mixer working in down-conversion mode having minimum conversion loss of 8.6 dB with +10 dBm local oscillator (LO) power and 3 dB radio frequency bandwidth of 180 MHz has been achieved at S-band. The novelty of the mixer is that it has inherent LO to intermediate frequency (IF) isolation greater than 18 dB without using an IF low pass filter. A systematic design of the mixer is presented with its simulated and experimental results. The mixer design concept presented here can be applied to design mixers at other frequencies. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:381-384, 2015