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首页> 外文期刊>International journal of RF and microwave computer-aided engineering >Design and fabrication of a continuous tunable microstrip lowpass filter with wide stopband and sharp response
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Design and fabrication of a continuous tunable microstrip lowpass filter with wide stopband and sharp response

机译：具有宽阻带和尖锐响应的连续可调微带低通滤波器的设计与制造

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摘要

Tunable microstrip lowpass filters (LPFs) with a good performance are used in most telecommunication systems. In this article, a third-order circuit with stepped impedance resonator is used to design LPF, and suppression cells are used to improve the performance of the filter in stopbands up to 20 GHz. The -3 dB cut-off frequency can be controlled in the range of 0.35 to 1 GHz with the tuning range of 96%. Rejection stopbands of 30 dB (type-I) and 20 dB (type-II) can be extended to more than 20 GHz. For the passband, the insertion loss variations are in the range of 0.35 to 2.12 dB. The proposed tunable LPF has a sharp roll-off rate (42-96 dB/GHz). The varactor-tuned microstrip LPF is designed, simulated, fabricated, and measured. The results of simulation and measurement for the proposed LPF are in good agreement. The size of the proposed tunable LPF is small and the filter dimensions are equal to 0.267 lambda g x 0.13 lambda g.
机译：大多数电信系统都使用性能良好的可调谐微带低通滤波器（LPF）。在本文中，采用带阶跃阻抗谐振器的三阶电路来设计LPF，并使用抑制单元来改善在高达20 GHz的阻带中的滤波器性能。 -3 dB截止频率可以控制在0.35至1 GHz的范围内，调谐范围为96％。 30 dB（I型）和20 dB（II型）的抑制阻带可以扩展到20 GHz以上。对于通带，插入损耗变化在0.35至2.12 dB的范围内。提出的可调LPF具有急剧的滚降率（42-96 dB / GHz）。变容二极管调谐微带LPF的设计，仿真，制造和测量。拟议的LPF的仿真和测量结果吻合良好。所提出的可调LPF的尺寸很小，滤波器的尺寸等于0.267λx 0.13λg。

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