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In this paper, the characteristics of a microstrip tab-coupled stub-loaded ring resonator are investigated, and design formulas for determining the 3dB bandwidth, passband reflection zeros, and transmission zeros of the resonator are derived based on the even- and odd-mode analysis of the equivalent circuit of the resonator. Design examples are provided which reveal that with appropriate choices of...
In this paper, a micostrip parallel-coupled dual-mode ring resonator is analyzed based on its equivalent transmission line circuit and the even- and odd-mode method. Closed-form formulas relating the transmission zeros and 3dB fractional bandwidth of the resonator to the circuit parameters are derived, and are verified effective by using a circuit simulator and an electromagnetic simulator. A bandpass...
In this paper, a compact microstrip dual-band bandpass filter (BPF) using stub-loaded two-mode resonators is developed. The midband frequencies of the two passbands can be adjusted separately. Furthermore, four transmission zeros are yield in the stopband of the filter by introducing direct coupling between the source and load of the filter. Significantly improved skirt properties of the dual-passbands...
In this paper, a novel millimeter-wave ultra-wideband (UWB) bandpass filter having a midband frequency of 26.5 GHz and a 3 dB bandwidth of 3.4 GHz is developed by using microstrip dual-mode rectangular ring resonators. Resonant properties of the microstrip dual-mode rectangular ring resonator are analyzed by using an electromagnetic simulator, and stepped- impedance parallel-coupled feed lines are...
In this paper, a novel dual-band bandstop filter (DBBSF) is proposed by using composite shunt resonators, and an approximate design method is developed based on the lumped-element circuit of the filter. Both the midband frequencies and the stopband widths of the dual bands of the filter can be controlled separately. A dual-band BSF with center frequencies of 1.7 and 2.3 GHz is designed and fabricated...
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