New balanced self oscillating mixer using DGS resonator

In this paper, a balanced self-oscillating mixer (SOM) using DGS resonator operating at 5.2 GHz is presented. Since H- slot DGS (defected ground structure) resonator achieves a high Q factor, it provides low phase noise for the oscillator. A balanced mixer is utilized and provides good LO-RF isolation since two LO signals (LO+, LO-) are suppressed at the RF input port. The oscillator generates balanced 4.77 GHz signal using an H-slot DGS. The IF at each port achieves 1 dB conversion gain at 430 MHz with 5.2 GHz RF input signal. This SOM presents a good linearity because IIP3 is observed about 6 dBm and 1 dB compression point is -4 dBm. Therefore, this SOM structure proposed here is suitable for WLAN environment.