A Dual-Band Bandpass Filter Using a Single Dual-Mode Ring Resonator
作者： Sheng Sun
DOI: 10.1109/LMWC.2011.2132119
关键词: Physics 、 Control theory 、 Microstrip 、 Elliptic filter 、 Resonator 、 Passband 、 Optical ring resonators 、 Optics 、 Stopband 、 Stub (electronics) 、 Band-pass filter
摘要: A simple microstrip ring-resonator is presented for novel design of dual-band dual-mode bandpass filters with good isolation and upper-stopband performance. By increasing the length loaded open-circuited stub, two first-order degenerate modes are excited slit use first passband, while one third-order moves downward forms second passband together a second-order mode. Meanwhile, three transmission zeros properly tuned rejections between passbands in upper stopband. After installing coupled-line sections on square ring at ports 90°-separation, filter poles each designed measured. Without adding any additional perturbation element inside ring, measured shows performance both in-band matching outside desired dual passbands.
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