基于短截线和马刺线的宽阻带带通滤波器设计
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中图分类号：TN713 文献标识码：A 文章编号：2096-4706（2025）15-0001-05
Design of Wide Stopband Bandpass Filter Based on Stubs and Spur Lines
TONG Anqi， YAN Junmei （SchoolofMechanicalandElectronic Engineering，Jngdezhen Ceramic UniversityJingdezhen333403，China）
Abstract： This paper presents a microstrip bandpass filter with high frequency selectivity and wide stopband characteristics.The filter is composed oftwo half-wavelength microstripresonators，adopting tapped coupling to introduce a zero-feeding scheme，generating two transmission zerosonboth sidesofthe passbandtoenhance frequencyselectivity.To improve stopband performance，two quarter-wavelength open-circuited stubs are loaded on the 50Ω feed lines to suppress harmonicsbyintroducing transmissionzeros.Additionall，spur linesareutilizedtofurthersuppresspurious pasbandswhile maintaininggoodpassbandperformance.Bycombiningthese two structures，the stopband performanceissignificantlyenhanced. A bandpass filter with a center frequency of 1.75GHz and a relative bandwidth of 5.0% is designed.A prototype is fabricated， and experimentalresults demonstrate that the2OdB stopbandrejectionlevel reaches up toseven timesthecenter frequency. Good agreement between simulated and measured performance is observed.
Keywords： wide stopband; bandpass filter; spur line; stub
0 引言
随着有限的频谱资源被不断开发并应用于各个领域，随之产生频谱资源紧张、频段之间干扰、寄生通带生成等问题，这些问题降低了信号的纯净度，极大地影响了信号传输的质量。（剩余6253字）
