Abstract
A compact high-selective dual-band pass filter is designed. The first passband is created by complementary open resonant ring defect ground structure, and the second is created by open circuit branch resonator. The presented design has advantages of steeper edge attenuation ramp, lower in-band insertion loss, better out-of-band rejection levels, and has compact structure. The center frequencies of dual bands are 2.4 GHz and 3.4 GHz, 3 dB bandwidths are 33 MHz and 32 MHz, and return loss is -36.36 dB and -36.07 dB. The first frequency band can be applied to the microwave interconnection access, and the second can be applied to WLAN, two passband has better isolation.
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