Design of Low-Cost Full W-Band 8th Harmonic Mixers for Frequency Extension of Spectrum Analyzer

IF 1 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

Iet Circuits Devices & Systems Pub Date : 2023-10-23 DOI:10.1049/2023/8196039

Jian Guo, Kaiyi Zang, Zihan Zhang, Liang Zhao, Jie Xu, Zhengbin Xu

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引用次数: 0

Abstract

High-order harmonic mixer is popular for frequency extension of spectrum analyzer (SA) from microwave to millimeter-wave or even terahertz band. The manufactures of SA usually offer expensive harmonic mixers where frequency extension is needed. In this work, low-cost designs of 2-port and 3-port W-band 8th harmonic mixers covering 75–110 GHz are proposed, and design method of two port mixer without frequency diplexer to separate local oscillator (LO) and intermediate frequency (IF) signals are first presented. These two kinds of mixers are compatible with almost all the current SAs with frequency extension options, which provides LO for the external harmonic mixer. The mixers are designed with planar microstrip lines and antiparallel Schottky diodes. The circuit of 2-port mixer includes the input broadband bandpass filter, diodes, output lowpass filter, and matching circuits. As for 3-port mixer, only an extra diplexer is needed to separate the IF signal and LO signal. The diplexer is composed of a planar semi-lumped lowpass and a highpass filter. The planar circuits are easily fabricated with low-cost print circuit board process on polytetrafluoroethylene substrate. The measured conversion loss of 2-port 8th harmonic mixer is from 20 to 26 dB, and 23 to 28 dB for 3-port mixer at full W-band. The good measured results indicate the proposed mixers are simple and effective.

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频谱分析仪扩频用低成本全w波段8次谐波混频器的设计

高次谐波混频器是频谱分析仪从微波到毫米波甚至太赫兹波段进行频率扩展的常用方法。在需要频率扩展的地方，SA的制造商通常提供昂贵的谐波混频器。本文提出了覆盖75-110 GHz的2口和3口w波段8次谐波混频器的低成本设计方案，并首次提出了不带频率双工器的两口混频器的设计方法，用于分离本振(LO)和中频(IF)信号。这两种混频器兼容几乎所有当前的sa与频率扩展选项，这为外部谐波混频器提供了LO。该混频器采用平面微带线和反平行肖特基二极管设计。二端口混频器电路包括输入宽带带通滤波器、二极管、输出低通滤波器和匹配电路。对于3端口混频器，只需要一个额外的双工器来分离IF信号和LO信号。双工器由平面半集总低通和高通滤波器组成。采用低成本的印刷电路板工艺在聚四氟乙烯衬底上易于制作平面电路。在全w波段，2口8次谐波混频器的转换损耗为20 ~ 26 dB, 3口混频器的转换损耗为23 ~ 28 dB。实测结果表明，该混合器简单有效。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Iet Circuits Devices & Systems 工程技术-工程：电子与电气

CiteScore

3.80

自引率

7.70%

发文量

审稿时长

3 months

期刊介绍： IET Circuits, Devices & Systems covers the following topics: Circuit theory and design, circuit analysis and simulation, computer aided design Filters (analogue and switched capacitor) Circuit implementations, cells and architectures for integration including VLSI Testability, fault tolerant design, minimisation of circuits and CAD for VLSI Novel or improved electronic devices for both traditional and emerging technologies including nanoelectronics and MEMs Device and process characterisation, device parameter extraction schemes Mathematics of circuits and systems theory Test and measurement techniques involving electronic circuits, circuits for industrial applications, sensors and transducers