CAJ | 학술논문

滤波器尺寸直接影响整个前端系统的集成度，滤波器小型化一直是研究热点。设计了一种紧凑的全微带结构的三阶全范数微波滤波器，该滤波器基于一短路枝节加载双模谐振器和一终端短路的半波长偶模谐振器，从而构成了全微带结构的三阶横向滤波器。相比传统纵向滤波器，微带结构的三阶全范数横向滤波器具有结构紧凑、选择性高和便于加工制造等优点。由于引入了源与负载直接耦合，该滤波器通带两侧具有3个传输零点，显著提高了滤波器的通带选择性以及消除了无用的高次谐波信号。设计的滤波器中心频率为1??5 GHz，绝对带宽为80 MHz，回波损耗约为22 dB。实测结果和仿真结果基本吻合。滤波器尺寸约为0??14λg ×0??076λg ，其中λg 为中心频率对应的波导波长。
려파기척촌직접영향정개전단계통적집성도，려파기소형화일직시연구열점。설계료일충긴주적전미대결구적삼계전범수미파려파기，해려파기기우일단로지절가재쌍모해진기화일종단단로적반파장우모해진기，종이구성료전미대결구적삼계횡향려파기。상비전통종향려파기，미대결구적삼계전범수횡향려파기구유결구긴주、선택성고화편우가공제조등우점。유우인입료원여부재직접우합，해려파기통대량측구유3개전수영점，현저제고료려파기적통대선택성이급소제료무용적고차해파신호。설계적려파기중심빈솔위1??5 GHz，절대대관위80 MHz，회파손모약위22 dB。실측결과화방진결과기본문합。려파기척촌약위0??14λg ×0??076λg ，기중λg 위중심빈솔대응적파도파장。
The size of filters impacts directly the whole front-end system integration,and the miniaturization of filters is always research hot spot.This paper proposes a compact three-order full canonical transversal microstrip bandpass filter.The microstrip filter is based on a short stub loaded dual-mode resonator (SSLDR) and a short-ended half-wavelength resonator (SEHR).Different from the conventional microwave filter,the three-order full canonical transversal microstrip filter presents miniaturization,high selectivity and simple fabrication.By utilizing the resonance properties of the transversal filter and the introduced source-load coupling (S-L coupling), the filter is designed with three transmission zeros at both sides of passband.The selectivity of passband is improved and the unwanted signal beyond the passband is rejected due to the transmission zeros.A 1?? 5 GHzthree-order transversal BPF is designed,which presents 80 MHz absolute bandwidth and an in-band return loss of 22 dB.The measured results match well with the simulations,and size of the proposed filter is less than 0.14λg ×0.076λg ,where λg is the guided wavelength at the center frequency.