本文選題：微帶圓極化 + 寬帶化　； 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：本文研究了微帶圓極化天線的相關(guān)理論,論述了有關(guān)微帶天線的一般結(jié)構(gòu)、三種分析方法和饋電方式,分析了圓極化的理論和基本特性,研究對(duì)比了微帶圓極化天線的幾種饋電方式。根據(jù)上述相關(guān)理論和應(yīng)用需求,優(yōu)化設(shè)計(jì)了三種不同特性的圓極化天線。一、由于在點(diǎn)對(duì)點(diǎn)通信、導(dǎo)航通信等系統(tǒng)中,需要天線實(shí)現(xiàn)寬帶阻抗和軸比特性。所以本文設(shè)計(jì)的第一款天線是寬帶圓極化天線。其工作頻段覆蓋了1.1GHz-1.6GHz。其中蝶形輻射貼片使天線具有寬帶阻抗特性,寬帶相位差特性的饋電網(wǎng)絡(luò)使天線獲取了寬帶軸比特性。同時(shí)為改善此寬帶天線的增益,在蝶形導(dǎo)體片的四周分別添加了方形環(huán)與圓環(huán),使天線的增益從9 dB提升到了10.3 dB。二、基于圓極化天線的多頻應(yīng)用,本文設(shè)計(jì)的第二款天線是能夠覆蓋WLAN/WiMAX兩個(gè)頻段的圓極化微帶天線。通過添加了多個(gè)T性和L性微擾元,使微帶天線獲得雙頻圓極化特性。為了改善其定向特性,在介質(zhì)基片的底端添加了一個(gè)矩形腔,從而有效的提升了天線的定向性和增益。三、針對(duì)圓極化天線的小型化需求,本文設(shè)計(jì)的第三款天線是小型化圓極化衛(wèi)星導(dǎo)航天線陣。其中通過短路銷釘加載技術(shù)實(shí)現(xiàn)單元的小型化。天線的工作頻段是1268.52±10.23MHz,單元的尺寸為32mm*32mm*19mm。在工作頻帶內(nèi)單元的特性是VSWR?1.5、AR?2dB、Gain?2.1dB,半功率波瓣寬度在1160左右。在陣列中,其特性是VSWR?1.5、AR?2.2dB、Gain??1.5dB。所以其較好的適應(yīng)了小型化陣列的需要。
[Abstract]:In this paper, the related theories of microstrip circular polarization antenna are studied, and the general structure, three analytical methods and feeding modes of microstrip antenna are discussed. The theory and basic characteristics of circular polarization are analyzed. Several feeding modes of microstrip circularly polarized antenna are studied and compared. According to the above theory and application requirements, three kinds of circularly polarized antennas with different characteristics are optimized. Firstly, the wideband impedance and axial ratio characteristics of antenna are needed in point-to-point communication, navigation communication and other systems. So the first antenna designed in this paper is broadband circular polarization antenna. The operating frequency range is 1.1 GHz ~ 1.6 GHz. The butterfly radiation patch makes the antenna have wideband impedance characteristic, and the broadband phase difference characteristic of the feed network makes the antenna obtain wideband axial ratio characteristic. In order to improve the gain of the wideband antenna, a square ring and a circular ring are added around the butterfly conductor, which increases the antenna gain from 9 dB to 10.3 dB. Secondly, based on the multi-frequency application of circularly polarized antenna, the second antenna designed in this paper is a circularly polarized microstrip antenna which can cover the two bands of WLAN/WiMAX. The dual-frequency circular polarization characteristics of the microstrip antenna are obtained by adding a number of T and L perturbation elements. In order to improve its directional characteristics, a rectangular cavity is added at the bottom of the dielectric substrate, which effectively improves the directionality and gain of the antenna. Third, aiming at the miniaturization demand of circular polarization antenna, the third antenna designed in this paper is miniaturized circular polarization satellite navigation antenna array. The miniaturization of the unit is realized by short-circuit pin loading technology. The operating frequency range of the antenna is 1268.52 鹵10.23 MHz, and the size of the unit is 32mm / 32mm-1 / 19mm. The characteristics of the cell in the working frequency band are as follows: VSWR 1.5dBU 2dBN Gain2.1dB.The width of the half-power lobe is about 1160. In the array, the characteristics are: VSWR1. 5 ~ (2. 2) dB ~ (2. 2) D ~ (2 +) ~ (1. 5) dB ~ (-) ~ (1.5) dB. So it adapts well to the need of miniaturization array.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN821.1

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