本文選題：頻率可重構(gòu)天線(xiàn) + 方向圖-頻率可重構(gòu)天線(xiàn)�。� 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：近幾年來(lái)，無(wú)線(xiàn)通信系統(tǒng)正逐步向超寬帶、多功能、多頻段等方向發(fā)展，而系統(tǒng)中的天線(xiàn)作為其出入通道，數(shù)目的大幅增加勢(shì)必導(dǎo)致整個(gè)通信系統(tǒng)體積龐大、成本遞增和電磁兼容性變差�！翱芍貥�(gòu)天線(xiàn)”可根據(jù)實(shí)際情況，實(shí)時(shí)改變其電氣特性，完成多個(gè)天線(xiàn)的能力，從而有效地減輕天線(xiàn)數(shù)的增加無(wú)線(xiàn)通信系統(tǒng)的影響。在涵蓋多個(gè)頻帶，產(chǎn)生不同的天線(xiàn)極化方式和輻射方向圖等方面，較以往常規(guī)天線(xiàn)而言有著巨大的優(yōu)越性。所以分析和研究可重構(gòu)天線(xiàn)具有顯著的現(xiàn)實(shí)意義和廣闊的應(yīng)用前景。 論文的主要研究?jī)?nèi)容為： 一、基于U型槽微帶貼片頻率可重構(gòu)天線(xiàn) 進(jìn)行開(kāi)有U型槽的頻率可重構(gòu)天線(xiàn)的設(shè)計(jì)研究，并用HFSS軟件做了相應(yīng)的建模和仿真實(shí)驗(yàn)。該天線(xiàn)是在微帶貼片上開(kāi)U型槽縫，并在U型縫隙3個(gè)不同位置加載PIN二極管做開(kāi)關(guān)，改變開(kāi)關(guān)的開(kāi)閉再組合其狀態(tài)，即可使得天線(xiàn)在5種不同的狀態(tài)下工作，分別具有5個(gè)相異的中心諧振頻率，完成天線(xiàn)在多個(gè)狀態(tài)下的頻率可重構(gòu)功能。 二、新型類(lèi)八木結(jié)構(gòu)微帶貼片方向圖-頻率可重構(gòu)天線(xiàn) 設(shè)計(jì)了一種新型的方向圖與頻率兩者同時(shí)可重構(gòu)的微帶天線(xiàn)，其幾何結(jié)構(gòu)類(lèi)似于微帶八木天線(xiàn)，由一個(gè)激勵(lì)貼片和另一個(gè)平面上的兩個(gè)寄生貼片構(gòu)成。天線(xiàn)共可工作在三個(gè)不同的中心頻率，其中心頻率分別為2.1GHz，2.4GHz和2.6GHz，頻率的轉(zhuǎn)換主要通過(guò)貼片上的PIN二極管實(shí)現(xiàn)，改變開(kāi)關(guān)模式可以使得貼片長(zhǎng)度發(fā)生變化。另外再使用了12個(gè)PIN二極管作開(kāi)關(guān)來(lái)實(shí)現(xiàn)方向圖在三個(gè)不同方向的可重構(gòu)。實(shí)驗(yàn)結(jié)果顯示，該天線(xiàn)可以在九個(gè)各異的模式下工作。較傳統(tǒng)天線(xiàn)，，該設(shè)計(jì)功能，增加了天線(xiàn)頻率可重構(gòu)，即實(shí)現(xiàn)頻率與方向圖這兩個(gè)電特性的同時(shí)可重構(gòu)，此外，改變天線(xiàn)幾何結(jié)構(gòu)后，天線(xiàn)的增益和方向圖的偏移角度都有了明顯的提高。
[Abstract]:In recent years, wireless communication systems are gradually developing towards ultra-wideband (UWB), multi-function, multi-band and so on. However, the large increase in the number of antennas in the system will inevitably lead to the huge volume of the whole communication system. Increasing costs and poor electromagnetic compatibility. "Reconfigurable Antenna" can change its electrical characteristics in real time according to the actual situation, and accomplish the ability of multiple antennas, thus effectively reducing the influence of increasing the number of antennas in wireless communication system. It has great advantages over conventional antennas in many frequency bands, different antenna polarization modes and radiation patterns. Therefore, the analysis and study of reconfigurable antennas have significant practical significance and broad application prospects. The main contents of this thesis are as follows: First, the frequency reconfigurable antenna based on U-groove microstrip patch The design of frequency reconfigurable antenna with U-groove is studied, and the corresponding modeling and simulation experiments are done with HFSS software. The antenna is a U-slot on the microstrip patch, and the PIN diode is loaded in three different positions of the U-slot to switch. The switch is changed to change the opening and closing combination of the switch, which can make the antenna work in five different states. Each has five different central resonant frequencies, which can reconfigure the frequency of the antenna in multiple states. Second, a new type of octagon-like microstrip patch pattern-frequency reconfigurable antenna A new pattern and frequency reconfigurable microstrip antenna is designed. Its geometric structure is similar to that of a microstrip Yagi antenna, which consists of an exciting patch and two parasitic patches on the other plane. The antenna can work at three different central frequencies, whose central frequencies are 2.1GHz and 2.6GHz, respectively. The frequency conversion is mainly achieved by PIN diodes on the chip, and the length of the patch can be changed by changing the switching mode. In addition, 12 PIN diodes are used as switches to reconfigure the pattern in three different directions. Experimental results show that the antenna can work in nine different modes. Compared with the traditional antenna, the design function increases the frequency reconfiguration of the antenna, that is, the frequency and pattern can be reconfigurable at the same time. In addition, after changing the geometry of the antenna, the antenna can be reconfigurable at the same time. The gain of the antenna and the offset angle of the pattern are obviously improved.
【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(lèi)號(hào)】：TN820

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