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In this paper, a tunable microstrip antenna-filter is proposed based on a double U-shaped defected ground structure (DGS) and compact tunable square-loop dual-mode bandpass filter using capacitively loaded resonator. The antenna structure consists of a simple trapezoid monopole with a DGS microstrip feedline for excitation and this also yields a broaden impedance bandwidth covering 0.8 GHz to 2 GHz...
In this paper, a dual-mode bandpass filter using square-loop resonator is proposed for wideband applications. By introducing two capacitive stepped-impedance inner arms along the square-loop resonator, a wide passband response is achieved. In addition, the degradation of the insertion loss over the passband can be enhanced by a pair of tight coupling feed lines located at two perpendicular positions...
A novel triple U-shaped defected ground structure (DGS) unit is proposed. In contrasts to the conventional single bandgap DGS, the proposed DGS unit provides three controllable bandgaps at different frequencies but still retaining the size as compact as that of the single-bandgap DGS. Cascading this new DGS element to the conventional dual-mode bandpass filter, multi-spurious suppression of the dual-mode...
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