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In this paper, the stepped impedance resonator filter is introduced whose parasitic passband, one of the key characteristics of stepped impedance resonator filter, is analyzed. Then, the methods to improve the parasitic passband suppression are proposed. The research shows that three different components: the lambda/4 open stub, the VIA and the resistance attached to the center of the stepped impedance...
A compact dual band bandpass filter is presented here, in which an open loop resonator connected with a short-circuited stub loaded in the midpoint is used. The central frequencies of two bands can be regulated by alternating the characteristic impedance and electrical length of the open loop and the short-circuited stub respectively. By introducing new coupling structure, the coupling coefficient...
A novel compact quarter-wavelength resonator filter using the lumped coupling elements is presented in this letter. The filter not only has controllable transmission zeros near its passband, but also features compact circuit size. Based on the equivalent circuit model, a bandpass filter with the center frequency of 1.85 GHz has been designed and fabricated. Measured results have validated the theoretical...
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