發(fā)布時(shí)間：2018-09-14 16:34

【摘要】：隨著無線通信系統(tǒng)的快速發(fā)展，多頻帶天線逐漸成為研究熱點(diǎn)，鑒于與其它微波器件方便集成、便于攜帶等優(yōu)點(diǎn)，共形天線受到越來越多人的關(guān)注。另一方面，作為新世紀(jì)的重點(diǎn)研究內(nèi)容—頻率選擇表面（FSS），又可稱為空間濾波器，其設(shè)計(jì)要求隨著無線通信技術(shù)的發(fā)展越來越高，小型化、性能穩(wěn)定和多頻段是幾大發(fā)展特點(diǎn)。而超材料（MM）作為一種特殊的空間濾波器受到越來越多學(xué)者的關(guān)注。近年來，國內(nèi)外學(xué)者一直致力于多頻、小型化的單元結(jié)構(gòu)的研究，從而用于設(shè)計(jì)高性能的空間濾波器。此外，作為無線射頻前端的關(guān)鍵部件—濾波器，其小型化、多頻段和高性能成為研究熱點(diǎn)。本論文主要從以下幾個(gè)方面進(jìn)行研究： (1)對(duì)傳統(tǒng)的蝶形天線進(jìn)行改進(jìn)，提出了一種應(yīng)用于WiMAX和X波段的柔性雙頻帶天線，并對(duì)其進(jìn)行了仿真、分析、加工及測(cè)試。該新型天線相較于傳統(tǒng)的蝶形天線尺寸大幅度減小，，并且實(shí)現(xiàn)了雙頻帶的效果。此外，該天線采用的是共面波導(dǎo)(CPW)饋電方式，方便與系統(tǒng)電路進(jìn)行集成。最后，由于該天線采用的是柔性的材料作為介質(zhì)基板，對(duì)其進(jìn)行了彎折性測(cè)試，測(cè)試結(jié)果表明該天線對(duì)彎折狀況不敏感，對(duì)未來柔性材料的應(yīng)用奠定了一定的基礎(chǔ)。 (2)在對(duì)傳統(tǒng)分裂環(huán)諧振器(SRR)的基礎(chǔ)上進(jìn)行了改進(jìn)，并設(shè)計(jì)了一款雙頻帶空間濾波器。本文對(duì)一個(gè)柔性的雙頻帶空間濾波器的傳輸特性、輸入角度穩(wěn)定性、電流分布進(jìn)行了分析，并對(duì)加工制作出的雙頻帶空間濾波器進(jìn)行測(cè)試，測(cè)試結(jié)果和仿真結(jié)果吻合較好，從而驗(yàn)證了本文設(shè)計(jì)原理的有效性。該平面雙頻帶空間濾波器采用了柔性介質(zhì)板，方便加工和測(cè)試，并且易于與應(yīng)用材料表面進(jìn)行共形�？偟膩碚f，設(shè)計(jì)的柔性雙頻帶空間濾波器對(duì)將來雙頻帶或多頻帶的隱身介質(zhì)和共形形狀的空間濾波器研究具有推動(dòng)作用。 (3)提出和設(shè)計(jì)了一個(gè)簡單的三模非對(duì)稱加載枝節(jié)諧振器(ASLR)單元，并對(duì)其等效電路和特性進(jìn)行了詳細(xì)的分析。在此基礎(chǔ)上，將兩個(gè)ASLR單元的枝節(jié)進(jìn)行彎折并采用偽交趾方式耦合用于設(shè)計(jì)三頻帶帶通濾波器，采用兩階諧振器的目的是提高通帶的選擇性，兩旁的饋線通過縫隙耦合的方式耦合到諧振器。通過調(diào)節(jié)阻抗比和電長度比可以實(shí)現(xiàn)頻率的控制，極大的提高了該款三頻帶濾波器的選擇性。該濾波器設(shè)計(jì)的通帶分別為GPS，4G和WiMAX頻段，其電路尺寸小巧便于集成。最后經(jīng)過濾波器實(shí)物制作和測(cè)試，實(shí)測(cè)結(jié)果和仿真結(jié)果吻合，證明了分析和設(shè)計(jì)理論的正確性和有效性。
[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
【分類號(hào)】：TN713

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