【摘要】：隨著互聯(lián)網(wǎng)的快速發(fā)展,人們對于多媒體信息的快速傳遞有著越來越高的要求,這一現(xiàn)象推動著移動通信系統(tǒng)向著寬帶化方向前進。與此同時,工作在多個頻段的移動通信系統(tǒng)促進著天線向多頻帶方向發(fā)展。基于以上研究背景,本文做了如下研究:1.對寬帶電磁互補偶極子天線進行了研究。該天線由寬帶窄縫輻射體和電偶極子組成,其中窄縫輻射體是在中間縫隙產(chǎn)生的二分之三波長電場為零的地方,引入一對短縫隙,通過調節(jié)短縫隙的長度以及短縫隙之間的距離,可以使二分之三波長的諧振模靠近半波長的諧振模,最終形成寬帶效應。由于天線是在縫隙的中間位置進行饋電,理論上任何偶次諧振模都不會存在。經(jīng)過實物加工和測量,此電磁互補天線的相對帶寬為40.2%,并且頻帶內存在兩個諧振頻點。2.對三種寬帶蝶形平面天線進行了研究。第一種天線結構由等切角蝶形貼片和L形微帶線組成。該天線只有一個工作頻帶,|S11|-15dB的相對帶寬為38%,覆蓋了1.7-2.5 GHz頻段,并且頻帶內輻射方向圖穩(wěn)定,交叉極化很小。第二種天線結構由等切角蝶形貼片和不等邊T形微帶線組成。該天線有兩個工作頻帶,|S11|-15dB的相對帶寬為分別為43.6%和16.2%,覆蓋了1.56-2.43GHz頻段和3.0-3.51GHz頻段。該天線頻帶內輻射方向圖穩(wěn)定,但是交叉極化比第一種天線要差一些。第三種天線結構由不等切角蝶形貼片和不等邊T形微帶線組成。該天線有三個工作頻帶,|S11|-10dB的相對帶寬為分別為68%,14.98%和7%,覆蓋了1.6-3.25GHz頻段,3.52-4.09 GHz頻段和5.83-6.28GHz頻段。
[Abstract]:With the rapid development of the Internet, people have more and more high requirements for the rapid transmission of multimedia information. This phenomenon promotes the mobile communication system to move towards the direction of broadband. At the same time, mobile communication systems operating in multiple frequency bands promote the development of antenna to multi-band. Based on the above research background, this paper does the following research: 1. The broadband electromagnetic complementary dipole antenna is studied. The antenna consists of a wide band narrow slit radiator and an electric dipole, in which a pair of short slits are introduced where the 3/2 wavelength electric field generated by the middle slot is zero. By adjusting the length of the short gap and the distance between the short gaps, the resonant mode of 3/2 wavelength can be close to the half wavelength resonant mode, and the broadband effect will finally be formed. Since the antenna is fed in the middle of the slot, theoretically no even resonant mode exists. After physical processing and measurement, the relative bandwidth of the electromagnetic complementary antenna is 40.2 and there are two resonance frequency points. Three kinds of wideband butterfly planar antennas are studied. The first antenna structure consists of an equal-tangent butterfly patch and a L-shaped microstrip line. The antenna has only one working band, and the relative bandwidth of S11-15dB is 38. It covers the 1.7-2.5 GHz band, and the radiation pattern is stable and the cross-polarization is very small. The second antenna structure consists of an equal-tangent butterfly patch and a non-equilateral T-shaped microstrip line. The antenna has two operating bands. The relative bandwidth of the S11 -15dB is 43.6% and 16.2dB, respectively, covering the 1.56-2.43GHz band and the 3.0-3.51GHz band. The radiation pattern in the antenna band is stable, but the cross-polarization is worse than the first antenna. The third antenna structure consists of a butterfly patch with unequal tangent angle and a T-shaped microstrip line with unequal edges. The antenna has three operating bands, and the relative bandwidth of S 11 -10 dB is 68% and 7%, respectively, covering the 1.6-3.25GHz band 3.52-4.09 GHz band and the 5.83-6.28GHz band.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN822

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