V-band Low-noise Amplifier Is Developed

The dissertation, connected with preliminary development missions of Defence Science & Techlology, i.e., receiving systems in satellite Millimeter-Wave (MMW) communications, has been developed. This work is a co-operation project with the 13th Institute of Electronic Science & Technology Group of China. The project needs to realize low-noise amplification at AAGHz in F-band, which serves as a Low Noise Amplifier (LNA) of receiving systems in converters of satellite communications.In introduction, the dissertation formulates the properties of MMW, the development sketch of this project in the worldwide, and the author's chief work. After calculating the dispersive properties of BJ400 waveguides, analyzing the effective dielectric constant, and the dispersion and discontinuity in MMW microstrips, Section Two generalizes some engineering experimental formulas to fit the project applications.Section Three analyses and designs three common transitions, i.e., the waveguide-to-ridged waveguide-to-microstrip transition, the transition via waveguide-to-antifinline-to-microstrip, and via microstrip probe. Based on the above design, we analyze a finline transition of weighed exponential curves, and propose a novel waveguide-to-microstrip transition which effectively overcomes the difficulties in the mounting reproducibility and DC-block restriction of the ridged waveguide-to-microstrip transition in engineering applications.And Section Four is the design of MMW filters. MMW filters are the important functional components in passive circuits and, have also been analyzed and developed extensively. On the basis of briefly formulating the design approach of MMW filters and, in practice, designing a parallel-coupled microstrip Bandpass Filter (BPF), the dissertation presents and designs a novel compact cross-coupled MMW BPF. Centered at 35GHz, we have designed and fabricated the filter and tested its frequency performances for demonstration. The measured results have shown sharp rejections at both out-bands, and small ripples in passband but for slightly higher insertion losses.After expounding the MMW LNA devices, basic theory and framework design, we, according to the project specification, have designed and manufactured the F-band LNA component and, measured its electronic performances. Furthermore, we have concluded from it and presented improved measures. And this is the contents of the last three sections.The contribution of the dissertation lies in, in the much higher MMW-bands, analyzing and exploring MMW LNAs, the critical components of receiving systems in MMW communications. Moreover, coupled with proposing, analyzing and designing the novel waveguide-to-microstrip transitions and the new MMW BPFs suiting practical applications, the dissertation puts a base for future MMW research and circuit design to our project team in the much higher MMW-bands.