發(fā)布時(shí)間：2019-05-22 04:23

【摘要】：微波移相器是改變微波信號(hào)相位的器件,普遍應(yīng)用于微波通信、相控陣?yán)走_(dá)等領(lǐng)域。本文主要對(duì)微波薄膜移相器的原理做了理論研究,對(duì)微波薄膜移相器做了設(shè)計(jì),討論了移相器各部分的尺寸變化對(duì)器件性能的影響。根據(jù)鐵氧體材料的旋磁特性設(shè)計(jì)了鐵氧體薄膜移相器。鐵氧體材料的磁導(dǎo)率顯示了張量特性,當(dāng)外加磁場(chǎng)的強(qiáng)度和方向變化時(shí),鐵氧體的磁導(dǎo)率也將會(huì)發(fā)生改變,從而改變了鐵氧體的傳播常數(shù),也就改變了電磁波的傳播特性,這樣就產(chǎn)生了相移,相移的大小受到恒穩(wěn)磁場(chǎng)的控制。薄膜材料和基片材料采用的是YIG(釔鐵石榴石)和GGG(釓鎵石榴石),導(dǎo)體材料采用的是金。分析了已有的幾種薄膜移相器,對(duì)它們的原理和結(jié)構(gòu)進(jìn)行了研究,設(shè)計(jì)出了一種基于共面波導(dǎo)結(jié)構(gòu)的鐵氧體移相器。根據(jù)微波平面?zhèn)鬏斃碚摵蛯?duì)旋磁材料特性的分析,獲得波動(dòng)傳輸方程,計(jì)算出了移相器的各部分尺寸。對(duì)鐵氧體材料、基片材料和金屬導(dǎo)體材料進(jìn)行了篩選,研究了移相器的傳輸特性,對(duì)移相器各部分尺寸進(jìn)行了設(shè)計(jì)、仿真和優(yōu)化。利用HFSS軟件對(duì)共面波導(dǎo)結(jié)構(gòu)的性能進(jìn)行了模擬仿真,對(duì)移相器各部分尺寸做了優(yōu)化,研究了中心導(dǎo)線的寬度、共面波導(dǎo)間隙、薄膜厚度以及電極的厚度等參數(shù)對(duì)器件性能的影響。研究結(jié)果表明:所設(shè)計(jì)的移相器在50GHz中心頻率下得到了較好的性能,插入損耗小于2dB,電壓駐波比小于1.5。
[Abstract]:Microwave phase shifters are devices that change the phase of microwave signals and are widely used in microwave communication, phased array radar and other fields. In this paper, the principle of microwave thin film phase shifters is studied theoretically, the microwave thin film phase shifters are designed, and the influence of the size change of each part of the phase shifters on the performance of the devices is discussed. According to the rotating magnetic characteristics of Ferrite materials, the phase shifters of Ferrite thin films were designed. The permeability of Ferrite material shows the characteristic of Zhang Liang. When the intensity and direction of applied magnetic field change, the permeability of Ferrite will also change, thus changing the propagation constant of Ferrite, which also changes the propagation characteristic of electromagnetic wave. In this way, the phase shift is produced, and the size of the phase shift is controlled by the constant magnetic field. The thin film materials and substrate materials are YIG (yttrium iron garnet) and GGG (gadolinium gallium garnet), and the conductor materials are gold. Several kinds of thin film phase shifters are analyzed, their principle and structure are studied, and a Ferrite phase shifter based on coplanar waveguide structure is designed. According to the microwave plane transmission theory and the analysis of the characteristics of rotating magnetic materials, the wave transmission equation is obtained, and the dimensions of each part of the phase shifter are calculated. Ferrite materials, substrate materials and metal conductor materials were screened, the transmission characteristics of phase shifters were studied, and the dimensions of each part of the phase shifters were designed, simulated and optimized. The performance of coplanar waveguide structure is simulated by HFSS software, and the size of each part of the phase shifter is optimized. the width of the central conductor and the gap between the coplanar waveguides are studied. The effects of film thickness and electrode thickness on the performance of the device. The results show that the designed phase shifters have good performance at the central frequency of 50GHz, the insertion loss is less than 2dB, and the VSWR is less than 1.5.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN623

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