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Millimeter-wave broadband harmonic mixers

Author: BaiRui
Tutor: XuJun
School: University of Electronic Science and Technology
Course: Radio Physics
Keywords: Harmonic mixer Broadband mixer Finline Microstrip - finline transition Millimeter wave
CLC: TN773
Type: Master's thesis
Year: 2008
Downloads: 381
Quote: 3
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Abstract

Superior performance in the millimeter-wave systems, harmonic mixing components, not only on the system performance plays a key role, as well as signal source can reduce costs and improve the integration density of the system. With the improvement of modern applications band and the widening of the frequency range, broadband harmonic mixer applications get more and more attention. Millimeter wave broadband harmonic mixers study and design of the U-band and V-band the broadband harmonic mixer components. The work should the user needs, design U-band and V-band broadband receiver components, this article is mainly responsible for the development work of the harmonic mixer. The U and V band, broadband frequency performance, the conversion loss of less than 17dB and 20dB respectively, each port isolation requirements greater than 20dB. Indicators requirements and the actual conditions, the frequency of the local oscillation signal is designed to 1/4 of the RF signal frequency, and the input power is 5dBm after the secondary frequency multiplier and power amplification, and then the secondary harmonic mixer in the line circuit of the fin frequency. According to the above design ideas, anti-parallel diode (DMK2308), to achieve the second harmonic mixer; monolithic RF microwave integrated circuit (MMIC) frequency multiplier and power amplifier; finline circuit structure to achieve broadband mixer circuit. First, the harmonic mixer introduced analysis and elaborate harmonic mixing characteristics and technical requirements. Followed by the analysis and design of broadband harmonic mixers achieve two possible reference design. Furthermore, the research and experimentation finline circuit characteristics and different finline structure, bilateral finline harmonic mixers were designed for different finline structure, unilateral finline harmonic mixer and single ridge finline harmonic mixer. And in which the transition circuit, the matching circuit and the signal circuit structure for the design and analysis. In order to meet the requirements of system miniaturization and integration, this paper designed a a novel microstrip - finline transitional model, to microstrip circuit finline circuit integration application. Depending on the fin-line structure, respectively, corresponding to design a microstrip - unilateral finline transition, microstrip - bilateral finline transition and microstrip - single dorsal fin line transition model. The theoretical analysis and discussion of the transition characteristics, and processing of the experimental sample test validation. This article ultimately bilateral finline harmonic mixer circuit as user product. The test results show that the broadband harmonic mixing characteristics within the requirements of the entire band, bilateral finline harmonic mixer conversion loss, isolation and stability indicators meet the requirements on the user works . The harmonic mixer on the unilateral finline and single dorsal fin line was developed and tested the both circuit structure to achieve better broadband mixer features, and has some of the different characteristics of the application. Finally, according to the test results, analysis and discussion of the factors affecting the performance of the mixer, and put forward some improvement measures and improvement program. As important parts of the millimeter-wave receiver systems, broadband harmonic mixers, whether in the military field or civilian fields will be more development and application. The paper developed broadband finline harmonic mixer can provide some reference value for future research and design work.

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