Research On Miniaturization Technology Of Microwave Passive Devices Based On Substrate Integrated Waveguide

With the increasing requirements for broadband,miniaturization and integration of microwave devices in the information and communication industry,the substrate integrated waveguide(SIW)structure has become a research hotspot in the microwave field for its remarkable advantages.Based on the miniaturization technology of microwave passive components with SIW structure,this thesis studies the structure of slow wave substrate integrated waveguide(SW-SIW)and its application in dual band antenna and radar cross section(RCS).The contents are divided into four parts shown as follows.1.An ultra-wideband antenna with a frequency range of 2 GHz-12 GHz is proposed.The antenna realizes the five narrow band signals notched-band characteristics by etching an elliptical open-loop resonator on the metal layer and fabricating U-shaped parasitic strips beside the feed line.The measured results show that the performance of the proposed antenna,such as operating frequency band,directivity and gain,are in good agreement with the simulated results.2.A dual-ring-slot dual-band broadband antenna based on a SW-SIW structure with a frequency range of 10 GHz-15 GHz is proposed.Its working frequency bands are12.16 GHz-13.12 GHz and 14.11 GHz-14.43 GHz,the impedance bandwidths are 7.6%and 2.4%,respectively.The peak gain at the resonance frequency is 8.2 d B and 8.6 d B.Compared with the basic structure antenna designed in this article,the impedance bandwidth and gain of this antenna have been improved.The measured data shows that the working frequency band and working bandwidth of the proposed antenna are in good agreement with the simulation results.3.A dual-band antenna with a single ring slot based on a SW-SIW structure with a frequency range of 10 GHz-15 GHz is proposed.Its operating frequency bands are12.04 GHz-13.88 GHz and 14.15 GHz-14.58 GHz,impedance bandwidths are 14.2%and 3.25%.The peak gains at the resonant frequency points of 12.26 GHz,12.59 GHz,and 14.43 GHz are 6.3 d B,7.6 d B,and 9.2 d B,respectively.The impedance bandwidth of the proposed antenna and the peak gain at the high-frequency resonance frequency point are greatly improved.The measured data shows that the working frequency band and working bandwidth of the antenna are in good agreement with the simulation results4.The relevant theoretical knowledge and design of adjustable RCS based on phase gradient surface and SW-SIW structure are studied.The simulation results show the feasibility and effectiveness of the two adjustable RCS schemes.