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提出了一款新型平面四频带滤波器。首先设计了一个频率可控的四模谐振器,当外接激励时,该谐振器产生4条不同的谐振路径,通过控制4条不同谐振路径的长度,实现了对4个频带的独立控制。由于4条不同谐振路径共用了一段微带传输线,即有一段公共的传输路径,从而实现了滤波器小型化的目的。然后利用该谐振器设计了一款频率独立可控的小型化四频带滤波器。该滤波器尺寸为0.1λg×0.11λg(11.2mm×11.7mm),4个通带的中心频率为1.6/3.5/5.0/7.2GHz,回波损耗小于15dB。6个传输零点增加了滤波器的频率选择性和带外的频率抑制水平,测试和仿真结果吻合。
A new planar four-band filter is proposed. Firstly, a four-mode resonator with frequency controllable is designed. When external excitation is applied, the resonator generates four different resonant paths. By controlling the lengths of four different resonant paths, the four bands are independently controlled. Since four different resonant paths share a section of microstrip transmission line, there is a common transmission path, thus achieving the purpose of filter miniaturization. Then the resonator is designed with a frequency-independent miniaturized four-band filter. The filter size is 0.1λg × 0.11λg (11.2mm × 11.7mm). The four passbands have a center frequency of 1.6 / 3.5 / 5.0 / 7.2GHz and a return loss of less than 15dB. The 6 transmission zeros increase the frequency selectivity of the filter and the out-of-band frequency rejection level. The test and simulation results are in good agreement.