Parallel coupled-line bandpass filter with branch-line shape for g-band frequency
Parallel coupled-line bandpass filter with branch-line shape for g-band frequency
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DOI：
10.1049/el.2009.0716
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发表时间：
2009-07
影响因子：
1.1
通讯作者：
C. Hwang;L. B. Lok;I. Thayne;K. Elgaid
中科院分区：
文献类型：
--
作者：
C. Hwang;L. B. Lok;I. Thayne;K. Elgaid
提出了一种基于共面波导技术的GaAs基片上的平行耦合线分支线型平面带通滤波器。单位并联耦合线带通滤波器采用了具有开路短截线的并联耦合线谐振器，具有抑制寄生带通的特性。该滤波器采用四个单元并联耦合线结构，并集成了分支线型结构，同时在输入输出端引入开路短截线，以提高滤波器的抑制性能。建议的四阶滤波器制作在GaAs衬底上，电介质厚度为50 μ m，金厚度为1.2 μ m。所制作的四阶带通滤波器在177 ~ 209 GHz频率范围内具有3 dB带宽，插入损耗为6.5 dB，抑制比为38 dB，回波损耗优于12 dB。它具有17%的高分辨率分数带宽。
A parallel coupled-line planar bandpass filter (BPF) with branch-line shape using coplanar waveguide technology on GaAs substrate is presented. The unit parallel coupled-line BPF utilises a parallel coupled-line resonator with an open-ended stub which has suppression response of spurious band. Four unit parallel coupled-line BPFs are integrated with branch-line shape and open-circuit stubs on input and output ports are also integrated for improvement of rejection performance. The proposed fourth-order filter was fabricated on GaAs substrate with dielectric thickness of 50 m and gold thickness of 1.2 mum. The fabricated fourth-order BPF shows a 3 dB bandwidth from 177 to 209 GHz frequency range with insertion loss of 6.5 dB, rejection of 38 dB and return loss better than 12 dB. It has a high resolution fractional bandwidth of 17%.