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基于信号干扰理论,提出了一种差分宽带带通滤波器结构。由于该滤波器结构具有互补对称性,使该滤波器在差模激励时表现为带通滤波器,在共模激励时表现为带阻滤波器。另外,共模激励时,输入/输出端口之间有两条电长度不同的传输路径,使得共模信号在整个通带范围内得到很好的抑制。试验结果表明:差模通带中心频率f0为7.85GHz;最大回波损耗低于-25dB;3dB相对带宽为61%(5.5~10.2GHz);通带内插入损耗最小可达0.2dB。在差模通带内,共模抑制最小可达-20dB,其中-20dB抑制共模阻带带宽可覆盖5.5~10.2GHz,实测结果与仿真结果吻合。
Based on the theory of signal interference, a differential wideband band-pass filter structure is proposed. Due to the complementary symmetry of the filter structure, the filter behaves as a band-pass filter during differential-mode excitation and as a band-stop filter during common-mode excitation. In addition, common-mode excitation, the input / output ports have two different length of the transmission path between the electrical length, making the common-mode signal within the passband is well suppressed. The experimental results show that the center frequency f0 of differential mode passband is 7.85GHz, the maximum return loss is less than -25dB, the 3dB relative bandwidth is 61% (5.5-10.2GHz), and the insertion loss in the passband is as small as 0.2dB. In the differential mode passband, the common mode rejection of up to -20dB, of which -20dB common mode rejection bandwidth can cover 5.5 ~ 10.2GHz, the measured results and the simulation results.