共形雙頻帶天線及多頻帶濾波器的設(shè)計(jì)與研究
[Abstract]:With the rapid development of wireless communication system, multi-band antenna has gradually become a research hotspot. Due to the advantages of convenient integration and portability with other microwave devices, conformal antenna has attracted more and more attention. On the other hand, as the important research content in the new century, frequency selective surface (FSS), can also be called spatial filter. With the development of wireless communication technology, its design requirements are more and more high, miniaturization, stable performance and multi-frequency band. As a special spatial filter, metamaterial (MM) has attracted more and more attention. In recent years, scholars at home and abroad have been devoted to the study of multi-frequency, miniaturized cell structures, so as to design high-performance spatial filters. In addition, as a key component of RF front-end, filter, its miniaturization, multi-band and high performance has become a research hotspot. This paper mainly studies the following aspects: (1) improve the traditional butterfly antenna, propose a flexible dual-band antenna used in WiMAX and X-band, and simulate, analyze, process and test it. Compared with the traditional butterfly antenna, the size of the new antenna is greatly reduced, and the effect of double band is realized. In addition, the antenna adopts coplanar waveguide (CPW) feed mode, which is convenient to integrate with the system circuit. Finally, because the antenna is made of flexible material as the dielectric substrate, the bending property of the antenna is tested. The test results show that the antenna is not sensitive to the bending condition. It lays a foundation for the application of flexible materials in the future. (2) based on the traditional split ring resonator (SRR), a dual-band spatial filter is designed. In this paper, the transmission characteristics, input angle stability and current distribution of a flexible dual-band spatial filter are analyzed. The validity of the design principle is verified. The planar dual-band spatial filter uses a flexible dielectric plate, which is easy to process and test, and is easy to conformal with the applied material surface. In general, The designed flexible dual-band spatial filter can promote the study of the future double-band or multi-band stealth medium and conformal spatial filter. (3) A simple three-mode asymmetric addition is proposed and designed. (ASLR) element with branch resonator, The equivalent circuit and characteristics are analyzed in detail. On this basis, the branches of the two ASLR elements are bent and the pseudo-cross-toe coupling is used to design a three-band bandpass filter. The purpose of using the two-order resonator is to improve the passband selectivity. The feeders on both sides are coupled to the resonator by slot coupling. By adjusting the impedance ratio and the electric length ratio, the frequency can be controlled, which greatly improves the selectivity of the three-band filter. The filter is designed in GPS,4G and WiMAX band, and its circuit size is small and easy to integrate. Finally, the experimental results are in good agreement with the simulation results, which proves the correctness and validity of the analysis and design theory.
【學(xué)位授予單位】:華東交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:TN713
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