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A Low-Loss Coaxial Cavity Microwave Bandpass Filter with Post-Manufacturing Tuning Capabilities

机译:具有制造后调谐功能的低损耗同轴腔微波带通滤波器

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This paper presents a low-loss coaxial cavity microwave bandpass filter with post-manufacturing tuning capabilities. A systematic filter development using a low-pass prototype as the starting point to produce a fourth-degree Chebyshev bandpass response is demonstrated. The coaxial cavity filter based on the transverse electromagnetic mode of the propagation has a center frequency of 2.5 GHz and a bandwidth of 160 MHz. An insertion loss (S21) of 0.15 dB and a return loss (S11) better than 15 dB are obtained, particularly in the passband. An excellent agreement between ideal circuit, EM simulation and measurement results has been achieved. The filter is then modified to have two channels, known as a diplexer, wherein center frequencies are at 2.5 GHz and 2.9 GHz at a bandwidth of 200 MHz. This type of microwave filter will be useful in any microwave system wherein low insertion loss and high selectivity are crucial, such as in base station, radar, and satellite transceivers.
机译:本文提出了一种具有制造后调谐功能的低损耗同轴腔微波带通滤波器。演示了使用低通原型作为起点来产生四度切比雪夫带通响应的系统滤波器开发。基于传播的横向电磁模式的同轴腔滤波器具有2.5 GHz的中心频率和160 MHz的带宽。特别是在通带中,可获得0.15 dB的插入损耗(S21)和优于15 dB的回波损耗(S11)。在理想电路,电磁仿真和测量结果之间达成了极好的协议。然后将滤波器修改为具有两个称为双工器的通道,其中中心频率在200 MHz带宽下为2.5 GHz和2.9 GHz。这种类型的微波滤波器可用于任何低插入损耗和高选择性至关重要的微波系统,例如基站,雷达和卫星收发器。

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