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A novel compact dual-band bandpass filter based on a simple defected ground structure is proposed. This filter offers quasi-elliptic responses at both the passbands, and all its four transmission zeros near the passbands can be controlled to design for a wide range of center frequencies and bandwidths, without degrading the in-band performance in general. In this paper two dual-band bandpass filters...
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...
A tunable microstrip dual-band branch-line coupler using defected ground structure (DGS) stub tapped branch line is presented in this paper. Tuning the geometrical parameters of the DGS, both characteristic impedance and electrical length of an open stub can be controlled. To verify the frequency agility, a prototype dual-band coupler operated at 0.8 GHz and 1.9 GHz with 100 MHz frequency tuning range...
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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