【摘要】：可重構(gòu)天線在多功能、多頻段通信中具有很大的優(yōu)勢和廣泛的應(yīng)用背景。高保密通信技術(shù)也在通信中具有重要的意義。論文對可重構(gòu)天線以及基于“直接調(diào)制天線”的高保密通信技術(shù)開展研究。研究內(nèi)容在多功能、多頻段、高保密無線通信領(lǐng)域具有較好的應(yīng)用前景。本文的工作主要體現(xiàn)以下幾個方面:論文首先設(shè)計(jì)了一種新的頻率與圓極化可重構(gòu)天線,天線由上層介質(zhì)板上開有兩個正交縫的輻射貼片和下層介質(zhì)板上3dB定向耦合器的饋電結(jié)構(gòu)構(gòu)成。通過放置在上層的兩個正交縫隙上的兩組二極管,實(shí)現(xiàn)天線的頻率重構(gòu);通過放置在天線的輸入端和3dB定向耦合器之間的另外兩個二極管,實(shí)現(xiàn)天線在左旋圓極化與右旋圓極化之間切換。仿真和測試結(jié)果驗(yàn)證了天線的可重構(gòu)特性。然后設(shè)計(jì)了一種多頻與多極化可重構(gòu)天線,天線由一對角線饋電的輻射貼片和加載在其四周的寄生枝節(jié)組成,貼片與寄生枝節(jié)之間通過二極管連接。離饋電點(diǎn)較遠(yuǎn)的兩個寄生枝節(jié)通過另外兩個二極管與地相連接,而較近的兩個寄生枝節(jié)通過兩個電容與地相連接。通過改變二極管的通斷,天線具有5種工作狀態(tài):在一個頻段實(shí)現(xiàn)左右旋圓極化之間的切換,或工作在兩個頻段具有相反的線極化狀態(tài),以及作為一個對角線饋電的傳統(tǒng)貼片天線能夠輻射45o的線極化,測試結(jié)果驗(yàn)證了天線的可重構(gòu)特性。最后研究了基于相位直接調(diào)制陣列的多方向保密性通信:介紹了相位直接調(diào)制通信的機(jī)理并分析了其在通信上的優(yōu)勢;以一維陣列為例,討論了其多方向通信和保密特性;分析了傳統(tǒng)通信和直接調(diào)制天線的誤碼率計(jì)算公式;利用差分進(jìn)化(DE)算法優(yōu)化每個單元的相位偏移量,比較了傳統(tǒng)相控陣和相位直接調(diào)制相控陣在各個方向上的誤碼率。誤碼率的仿真結(jié)果驗(yàn)證了基于相位直接調(diào)制相控陣的多方向傳輸?shù)母弑Ｃ芴匦浴?br/>[Abstract]:Reconfigurable antenna has great advantages and wide application background in multifunctional and multi-band communication. High security communication technology is also of great significance in communication. In this paper, the reconfigurable antenna and the high security communication technology based on "direct modulation antenna" are studied. The research content has a good application prospect in the field of multifunctional, multi-band and high security wireless communication. The work of this paper mainly reflects the following aspects: firstly, a new frequency and circular polarization reconfigurable antenna is designed, which is composed of two orthogonal slit radiation patches on the upper dielectric plate and the feed structure of 3dB directional couplers on the lower dielectric plate. The frequency reconstruction of the antenna is realized by two sets of diode placed on the two orthogonal gaps in the upper layer, and the switching between the left-handed circular polarization and the right-handed circular polarization is realized by placing the other two diode between the input of the antenna and the 3dB directional coupler. The reconfigurable characteristics of the antenna are verified by simulation and test results. Then a multifrequency and multipolarization reconfigurable antenna is designed. The antenna is composed of a diagonal fed radiation patch and a parasitic branch loaded around it. The patch and the parasitic branch are connected by a diode. The two parasitic branches far from the feed point are connected to the ground through the other two diode, while the closer two parasitic branches are connected to the ground by two capacitors. By changing the on-off of the diode, the antenna has five working states: switching between left and right circular polarization in one frequency band, or opposite linear polarization in two frequency bands, and the traditional patch antenna, as a diagonal feed, can radiate 45o linear polarization. The test results verify the reconfigurable characteristics of the antenna. Finally, the multidirectional confidentiality communication based on phase direct modulation array is studied: the mechanism of phase direct modulation communication is introduced and its advantages in communication are analyzed; taking the one-dimensional array as an example, the multidirectional communication and security characteristics are discussed, and the BER calculation formulas of traditional communication and direct modulation antenna are analyzed. The differential evolution (DE) algorithm is used to optimize the phase offset of each unit, and the bit error rate (BER) of the traditional phased array and the phase direct modulation phased array in each direction is compared. The simulation results of bit error rate (BER) verify the high confidentiality of multidirectional transmission based on phase direct modulation phased array.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN822

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