基于交指滤波器的高隔离度宽带双工器设计

高杨; 文数文; 袁靖; 许夏茜

doi:10.11884/HPLPB201931.180308

基于交指滤波器的高隔离度宽带双工器设计

doi: 10.11884/HPLPB201931.180308

1.
中国工程物理研究院电子工程研究所, 四川绵阳 621999
2.
西南科技大学信息工程学院, 四川绵阳 621010

基金项目:

国家自然科学基金项目 61574131

详细信息

作者简介:
高杨(1972-), 男, 博士, 研究员, 从事微电子机械系统研究, gaoyang@caep.cn

中图分类号: TN603.5;TN629.1
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- 文章访问数: 1522
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- PDF下载量: 116
- 被引次数: 0
出版历程
- 收稿日期: 2018-11-08
- 修回日期: 2019-04-05
- 刊出日期: 2019-08-15

Design of interdigital-filter based diplexer with high isolation and wideband

1.
Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621999, China
2.
School of Information Engineering, Southwest University of Science and Technology, Mianyang 621010, China

摘要

摘要: 针对用于无线通信系统中的高隔离度宽带双工器, 首先将双工器指标拆分为留有一定余量的Tx, Rx滤波器指标, 然后使用微带交指结构和基于耦合系数与外部品质因数的改进方法, 设计出满足指标的宽带Tx, Rx滤波器, 最后使用两种T型结和滤波器组合的结构对双工器进一步设计, 并对这两种结构的微带双工器进行了仿真分析。仿真结果显示, 并行连接的双工器结构紧凑, 但隔离度较差; 串行连接的双工器通带内最小回波损耗为14.16dB, 最大插入损耗为1.01dB, 通带间最小隔离度为53.46dB, 双工器尺寸为8.089 9mm×2.059 1mm×0.302mm, 完全满足指标要求, 并且具有相对带宽大、隔离度高、插入损耗低的优点, 为设计高性能双工器提供了可行性。
- 微电子机械系统 /
- 双工器 /
- 交指滤波器 /
- 设计
Abstract: For diplexer with high isolation and wideband in wireless communication system, in this paper, the diplexer specification is divided into Tx and Rx filter specifications with a certain margin.Then the wideband Tx and Rx filter is designed by using the microstrip interdigital structure and the improved method based on coupling coefficient Kand external quality factor Qe.Finally, two kinds of T-junction and filter combination structures are used to further design the diplexer, and the microstrip diplexer with these two structures are simulated and analyzed respectively.The simulation results show that the structure of parallel connection diplexer is compact, but the passband isolation is not satisfactory.The minimum return loss in the passband of the series connection diplexer is 14.16 dB, the maximum insertion loss is 1.01 dB, the minimum passband isolation is 53.46 dB, and the size of the diplexer is 8.089 9 mm×2.059 1 mm×0.302 mm.It has the advantages of large relative bandwidth, high isolation and low insertion loss, which provides the feasibility for the design of high-performance diplexer.
- micro-electro-mechanical systems (MEMS) /
- diplexer /
- interdigital filter /
- design

HTML全文

图 1 Tx滤波器布局

Figure 1. Layout of Tx filter

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图 2 Tx滤波器S参数曲线

Figure 2. S-parameter curve of Tx filter

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图 3 5阶Rx滤波器S参数曲线

Figure 3. S-parameter curve of 5 order Rx filter

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图 4 Rx滤波器布局

Figure 4. Layout of Rx filter

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图 5 Rx滤波器S参数曲线

Figure 5. S-parameter curve of Rx filter

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图 6 传统双工器结构示意图

Figure 6. Schematic diagram of traditional diplexer structure

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图 7 并行连接双工器布局

Figure 7. Layout of parallel connection diplexer

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图 8 并行连接双工器初始设计结果

Figure 8. Initial design results of parallel connection diplexer

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图 9 串行连接双工器布局

Figure 9. Layout of series connection diplexer

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图 10 串行连接双工器S参数曲线

Figure 10. S-parameter curve of series connection diplexer

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表 1 双工器设计指标

Table 1. Design specifications of the diplexer

passband frequency range/GHz	passband isolation/dB	insertion loss/dB	return loss/dB	stop rejection/dB	dimension/mm
16.8~21.4 26.8~31.2	≥50	< 1.4dB	13.98	≥60@distal place	< 10×5×1

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表 2 Tx和Rx滤波器设计指标

Table 2. Design specification of the Tx filter and Rx filter

filter	center frequency/GHz	passband frequency range/GHz	insertion loss/dB	return loss/dB	stop rejection/dB
Tx	18.95	16.8~21.4	< 1dB	16	≥50@26.8 GHz~31.2 GHz
Rx	28.92	26.8~31.2	< 1dB	16	≥50@16.8 GHz~21.4 GHz

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