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In this letter, a miniaturized wideband filter using step-impedance stub loaded resonator (SISLR) and longer coupling line is presented. A wide passband is first constructed using step-impedance stub loaded resonator (SISLR), by driving this SISLR with parallel coupled-line on both sides. With enhancing the source-loaded coupling, longer coupling line is adopted in this filter, thus making up a wide...
A compact ultra-wideband (UWB) bandpass filter (BPF) using a multi-stub-loaded ring resonator is presented. The resonant frequencies of the proposed resonator can be tuned freely by changing the lengths of the corresponding stubs. By utilising the proposed multimode resonator, four resonant frequencies are evenly allocated in the UWB range and two transmission zeros are introduced at the lower and...
This paper presents a quad-band filter using centrally shorted-stub loaded resonators operated at the first and third passbands and stepped impedance resonators fixed at the second and fourth passbands. A special feed structure consisting of two stepped impedance lines is proposed, and a pair of parallel coupling lines is loaded at the center of the shorted-stub loaded resonators to enhance the couple...
This paper analyzes the parasitic problems of X-band electromagnetic environment microstrip SIR (Stepped Impedance Resonator) band-pass filter circuits, SIR filter is characterized by that its parasitic response can be adjusted through the impedance ratio K, which can enhance the performance of harmonic suppression. Then the ADS simulation tool is used to design an X-band SIR filter example, the simulation...
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