Research On Marching-on In-time Scheme And The Fast Algorithm Of Time Domain Integral Equation

With the rapid development of modern wireless communication technology, passive microwave and millimeter wave device, as a key component of the communication system, has been a hot topic in the research field of RF engineering. Miniaturization, multi-band / multi-mode, low cost and ease of integration with the active system has become a major research direction. In recent years, the novel structures of the various passive components, such as filters, duplexers, multiplexers, phase shifters, directional couplers, power dividers, power combiners etc. based on the substrate integrated waveguide and artificial dielectric material, have been reported. However, for different application areas of wireless communications, a single device design method can not meet the demand for rapid development of wireless communication. Therefore, this dissertation has faced the urgent application requirements of novel microwave and millimeter wave devices in the high-speedly developed wireless communication, based on the analysis of various design methods which had been reported, adopted the artificial medium and substrate integrated waveguide as starting points, introduced of the characteristics of electromagnetic transmission and dispersion in the artificial medium and substrate integrated waveguide, and proposed some design methods of novel passive devices / components suitable for microwave and millimeter wave wireless communication system. This dissertation has completed the relevant theoretical analysis, electromagnetic simulation and experimental verification, broken through key technical issues, such as miniaturization and multi-band, and proposed a solution of passive components for microwave and millimeter wave communication circuits and systems, including signal filtering, energy transition, power combining, absorbing match, duplex transceiver and antenna radiation etc. The research content was mainly divided into the following four parts:1. Based on the novel planar-structure artificial medium absorbing materials, this dissertation has presented a design method of the compact rectangular waveguide matching terminal. A novel planar structure of the artificial medium has been loaded into the rectangular waveguide shorted end, and the key parameters of the artificial medium size and the thickness of the artificial dielectric material has been optimizated, so that the rectangular waveguide terminal loaded by artificial medium could absorb electromagnetic energy perfectly without reflection. By theoretical analysis and calculation, electromagnetic simulation and optimization and physical experiments, and using a variety of artificial dielectric structure, a detailed analysis of electromagnetic wave reflection and matching mechanism and performance of this novel matching terminal has achieved.2. On the basis of conventional metal ring resonator as a kind of artificial medium unit, an improved metal ring resonator structure unit has been we proposed. This novel structure has been used to design compact microstrip bandpass filters, diplexers and other novel microwave millimeter wave frequency selection devices. One end of the typical metal ring resonator was directly connected to the ground plane using a vias hole, so a novel resonant unit which has an asymmetric effect has been achieved. Furtherore, these novel resonant units have been used to design compact filters, diplexers and other devices. In this dissertation, detailed mechanism analysis, electromagnetic simulation and physical experimens have been used to verify the effectiveness of the novel frequency selection devices.3. Based on the metal single ring cell structure which has multi-frequency resonance, the design technology of a compact planar monopole antenna has been proposed. This metal ring resonator having a plurality of resonant frequencies could be used as a planar monopole antenna radiating electromagnetic energy. And through good impedance matching design, multi-band and miniaturization could be achieved easily at the same time. In this dissertation, CPW and microstrip line have been used to feed the novel planar monopole antenna.4. Based on finline probe and microstrip gradient, the broadband transmissions of SIW to rectangular waveguide and microstrip line have been proposed respectively. Furthermore, a broadband transmission of the rectangular waveguide to microstrip line based on asymmetric finline probe has been achieved. At the same time, using the method of the transmission of SIW to microstrip line, a power combing technology based on HMSIW coupled bridgehas been proposed, and relevant theoretical analysis, electromagnetic simulation and physical experienments have been achieved.