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提出了一种新颖的波导带通滤波器设计。该滤波器是一个四阶广义切比雪夫滤波器,中心频率为9.93GHz,带宽为200 MHz,插损小于0.5 dB,带内回波损耗大于20 dB。谐振器为CQ结构,通过一个矩形波导膜片(一个不完全高度的导电杆),实现了交叉耦合,相比传统方法,产生一个额外的传输零点。由于在高端产生了两个零点,使得滤波器在阻带高端10.1 GHz处的带外抑制达到了35 dB以上。仿真实验证明了该设计方法能显著提高滤波器的带外抑制,对滤波器的小型化、高性能化有一定的意义。
A novel waveguide band-pass filter design is proposed. The filter is a fourth-order generalized Chebyshev filter with a center frequency of 9.93 GHz, a bandwidth of 200 MHz, an insertion loss of less than 0.5 dB, and an in-band return loss greater than 20 dB. The resonator is a CQ structure that achieves cross-coupling through a rectangular waveguide diaphragm (an incompletely-height conductive rod) that produces an extra transmission zero compared to conventional methods. With two zeroes at the high end, the out-of-band rejection of the filter above 10.1 GHz at the high end of the stopband is above 35 dB. The simulation results show that this design method can significantly improve the out-of-band rejection of the filter and has some significance for the miniaturization and high performance of the filter.