Compact Quad-Mode Bandpass Filter Based on Quad-Mode DGS Resonator


In this letter, a quad-mode bandpass filter is constructed up based on a unique quad-mode defected ground structure (DGS) resonator that has two symmetric planes. The odd-/even-mode theory is applied to analyze the operating principle of the four resonances with their equivalent circuit models. The four resonances can be effectively tuned by adjusting the corresponding dimensions. The fabricated filter contains a center frequency of two.45 GHz and a wide stopband up to seven.8 GHz with a rejection below 30 dB, that extends to a minimum of thirty GHz below sixteen dB. Particularly, the filter exhibits an glorious attenuation slope of 302 dB/GHz within the upper passband transition.

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