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In this letter, a quad-mode bandpass filter is built up based on a novel quad-mode defected ground structure (DGS) resonator which 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...
A high gain broadband antenna using a cylinder hollow-cavity microstrip structure with multilayer H-shaped slots is presented, which can be realized by microwave multi-layers technology (MLT). The measured impedance bandwidth of the proposed antenna is 32.3% with the reference of S11−10dB, and the measured gain of the antenna is 5.75dBi @ 16.1GHz and 6.2dBi @ 20GHz, which indicates a low gain fluctuation...
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