Wideband Microstrip Ring Resonator Bandpass Filters Under Multiple Resonances
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摘要: A new class of wideband microstrip bandpass filters is proposed under multiple resonances an asymmetric ring resonator. Two capacitive coupling elements are placed at two perpendicular positions a squared ring, whereas pair open-circuited stubs formed in the symmetrical plane these excited ports similar to dual-mode filter shape. By stretching paired close one-eighth wavelength, first even-order move down be quasi-equally located sides odd-order resonance, thus forming triple-resonance As interdigital coupled lines installed instead lumped capacitors, extra can moved into passband, thereby making up quintuple-resonance To provide insight their operating mechanism, resonators characterized terms transmission line theory. Afterwards, various resonator with one or optimally designed and fabricated. Simulated results confirmed via experiment, showing good filtering performance widened/deepened upper stopband sharpened rejection skirts outside wide passband.
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