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基于横向滤波器耦合结构,采用支节加载双模谐振器,设计了中心频率位于1.57 GHz(GPS应用)与2.4GHz(WLAN应用)的双频微带滤波器。由短路支节加载双模谐振器形成第一个通带,开路支节加载双模谐振器形成第二个通带,两个谐振器被输入/输出馈线隔离,每个通带的中心频率与带宽可以单独调节。测试结果表明:两个通带内的最小插损分别为2.18,1.35 dB,3 dB带宽分别为5.2%,6.8%,回波损耗均小于16 dB,三个传输零点分别位于1.28,2.08,2.71 GHz处。该滤波器具有尺寸小、带外选择性好等优点。
Based on the transversal filter coupling structure, a dual-mode microstrip filter with a center-frequency of 1.57 GHz (GPS application) and a 2.4 GHz (WLAN application) was designed. The dual-mode resonator is loaded by the short-circuit branch to form the first pass-band. The open-circuit branch is loaded with the dual-mode resonator to form the second pass-band. The two resonators are isolated by the input / output feeder. The center frequency of each pass- Bandwidth can be adjusted separately. The test results show that the minimum insertion loss in the two passbands is 2.18 and 1.35 dB respectively, the 3 dB bandwidth is 5.2% and 6.8% respectively, and the return loss is less than 16 dB. The three transmission zeros are located at 1.28, 2.08 and 2.71 respectively GHz. The filter has the advantages of small size, good out-of-band selectivity and so on.