本文選題：脈沖無線電　切入點：電小天線　出處：《南京航空航天大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：脈沖無線電系統(tǒng)在短距離通信、雷達(dá)檢測、定位測距等領(lǐng)域有著十分廣泛的應(yīng)用。然而,短時脈沖信號的寬帶特性對射頻前端和天線設(shè)計構(gòu)成了很大的挑戰(zhàn)。傳統(tǒng)的射頻無線系統(tǒng)采用頻域設(shè)計方法,在給定頻率范圍和輸入功率條件下,將天線和射頻前端電路作為線性時不變單元加以分析和設(shè)計,理論上系統(tǒng)性能存在增益-帶寬限制,導(dǎo)致了寬帶脈沖無線系統(tǒng)設(shè)計和實現(xiàn)上的諸多困難。本文針對脈沖信號的時域特性以及電小天線的輸入阻抗和輻射特性,研究和設(shè)計實現(xiàn)了一種基于超再生體系結(jié)構(gòu)的電小天線收發(fā)脈沖信號技術(shù)方案。與傳統(tǒng)的頻域設(shè)計方法不同,本文提出的技術(shù)方案從時域角度出發(fā),通過電小天線等效電路建模,實現(xiàn)超再生式射頻前端電路和電小天線一體化設(shè)計,提供了脈沖無線電小型化、低成本和低復(fù)雜度的一種新型實現(xiàn)途徑。具體而言,本文工作的主要內(nèi)容和成果包括:(1)利用電小天線輸入阻抗特性,將電小天線作為超再生電路中振蕩回路的一部分,設(shè)計形成了一種低成本、小型化的超再生式脈沖信號接收技術(shù)方案;(2)設(shè)計實現(xiàn)了一款適合與超再生式電路集成的貼片電小天線,對該天線進(jìn)行等效電路建模,并利用天線等效電路模型實現(xiàn)了天線與超再生電路的聯(lián)合時域仿真分析和設(shè)計;(3)利用電小天線輸入阻抗特性,將電小天線作為開關(guān)控制LC振蕩電路的組成部件,形成了有源振蕩電路與電小天線一體化設(shè)計,并在此基礎(chǔ)上實現(xiàn)了一種低成本、高效率的電小天線生成和發(fā)射脈沖技術(shù)方案;(4)結(jié)合電小天線等效電路模型的特點,通過建立自由空間傳播損耗的等效電路模型,實現(xiàn)了脈沖信號收發(fā)系統(tǒng)性能的時域聯(lián)合仿真。在此基礎(chǔ)上設(shè)計完成了基于超再生式體系結(jié)構(gòu)的電小天線收發(fā)脈沖實驗演示,結(jié)果表明,本文提出技術(shù)方案適合應(yīng)用于開關(guān)鍵控(On-off Keying,OOK)等調(diào)制方式下的脈沖無線通信。
[Abstract]:Pulse radio systems are widely used in short range communication, radar detection, location and ranging. However, The wideband characteristics of short-time pulse signal pose a great challenge to the design of RF front-end and antenna. The traditional RF wireless system adopts frequency-domain design method under given frequency range and input power. The antenna and RF front-end circuits are analyzed and designed as linear time-invariant elements. Theoretically, the system performance is limited by gain bandwidth. This paper aims at the time domain characteristic of pulse signal and the input impedance and radiation characteristic of small antenna. This paper studies and designs a scheme for transmitting and receiving pulse signals of small antennas based on super-regenerative architecture. Different from the traditional design method in frequency domain, the technical scheme presented in this paper is from the point of view of time domain. By modeling the equivalent circuit of electric small antenna, the integrated design of super-regenerative RF front-end circuit and electric small antenna is realized, which provides a new way to realize pulse radio miniaturization, low cost and low complexity. The main contents and achievements of this paper include: (1) using the input impedance characteristic of the electric small antenna, the electric small antenna is designed as a part of the oscillation circuit in the superregenerative circuit, and a kind of low cost is designed. A miniaturized super-regenerative pulse signal receiving technique scheme is designed and implemented. A patch electric small antenna suitable for integration with super-regenerative circuit is designed, and the equivalent circuit model of the antenna is built. Using the antenna equivalent circuit model, the combined time domain simulation analysis and design of antenna and super-regenerative circuit are realized. Using the input impedance characteristic of electric small antenna, the electric small antenna is used as the component of switching control LC oscillation circuit. Based on the integrated design of active oscillation circuit and electric small antenna, a low cost and high efficiency electric small antenna generating and transmitting pulse technical scheme is developed. By establishing the equivalent circuit model of free space propagation loss, the joint simulation of pulse signal transceiver system performance in time domain is realized. Based on this, the experimental demonstration of pulse transceiver for small electric antenna based on super-regenerative architecture is designed and completed. The results show that the proposed scheme is suitable for pulse wireless communication with on-off critical control OOKs and other modulation modes.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN820
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本文編號：1632334