本文關(guān)鍵詞： 超常媒質(zhì) 漏波天線 液晶材料 復(fù)合左右手傳輸線 電控掃描天線　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來，隨著衛(wèi)星通信系統(tǒng)與雷達探測系統(tǒng)的快速發(fā)展，電控掃描天線的需求與日俱增。相比于機械掃描天線，電控掃描天線具有方向圖掃描速度快、掃描精度高等顯著優(yōu)勢。尤其是基于超常媒質(zhì)的定頻掃描天線，由于具有饋電系統(tǒng)簡單、低剖面，集成度高等特性，近年來得到人們的廣泛關(guān)注。 為了實現(xiàn)超常媒質(zhì)定頻掃描天線在微波毫米波頻率的應(yīng)用，本論文針對加載液晶材料的超常媒質(zhì)定頻掃描天線進行了深入研究。首先，本文從液晶材料傳統(tǒng)光頻段可控特性出發(fā)，對在微波段展現(xiàn)的電磁特性進行建模，參數(shù)提取和仿真實驗。采用分塊法在數(shù)值仿真中逼近液晶材料的真實微波特性進行表征。第二，結(jié)合上述特性的討論，提出了一種基于液晶材料的電控機構(gòu)的掃描電控天線設(shè)計的新方法。該方法可以方便地對天線的輻射參量進行調(diào)控，電控機構(gòu)簡單易于設(shè)計加工，據(jù)此方法得到的天線能夠在Ku波段的定點上具有64度的掃描角度，掃描平均增益7.6dB，副瓣電平-6dB。最后，本文提出一種適用于輻射參量與阻抗參量協(xié)同調(diào)整與優(yōu)化的電控機構(gòu)設(shè)計方法，能夠同時實現(xiàn)良好的輻射特性與阻抗特性。通過雙調(diào)諧法設(shè)計的天線在Ku波段上能夠定點掃描50度，掃描平均增益10.3dB，，副瓣電平-13.5dB。 本文對于液晶材料在微波段性質(zhì)的分析以及應(yīng)用方法對設(shè)計基于液晶材料的微波及毫米波器件具有指導(dǎo)意義；文中提出的兩種設(shè)計方法不僅適用于漏波天線的設(shè)計，也可以應(yīng)用于各類基于傳輸線理論和超常媒質(zhì)理論的液晶微波器件設(shè)計中；根據(jù)兩種方法設(shè)計的天線在輻射角度、增益和副瓣電平水平上符合雷達及衛(wèi)星通信系統(tǒng)的需求，可以作為這類系統(tǒng)中良好的技術(shù)儲備。
[Abstract]:In recent years, with the rapid development of satellite communication system and radar detection system, the demand of electronically controlled scanning antenna is increasing day by day. Especially the fixed frequency scanning antenna based on supernormal medium has been paid more and more attention in recent years because of its simple feed system low profile and high integration. In order to realize the application of the supernormal medium fixed frequency scanning antenna in the microwave millimeter wave frequency, this paper makes a deep research on the super normal medium fixed frequency scanning antenna loaded with liquid crystal material. In this paper, based on the controllable characteristics of the traditional optical frequency band of liquid crystal material, the electromagnetic characteristics of the liquid crystal material in microwave band are modeled. Parameter extraction and simulation experiments. The real microwave characteristics of liquid crystal materials are approximated by block method in numerical simulation. Secondly, based on the discussion of the above characteristics, A new design method of scanning electronic control antenna based on liquid crystal material is proposed. This method can easily control the radiation parameters of the antenna, and the electronic control mechanism is simple and easy to design and process. The antenna obtained by this method can have a scanning angle of 64 degrees at a fixed point in Ku-band, the average scanning gain is 7.6 dB, and the sidelobe level is -6 dB. Finally, In this paper, a design method of electronic control mechanism is presented, which is suitable for the coordinated adjustment and optimization of radiation and impedance parameters. The antenna designed by dual tuning method can scan 50 degrees at a fixed point, average gain of 10.3 dB and sidelobe level of -13.5 dB in Ku band. In this paper, the analysis and application of liquid crystal materials in microwave section are helpful to the design of microwave and millimeter wave devices based on liquid crystal materials, and the two design methods proposed in this paper are not only suitable for the design of leaky wave antennas, but also for the design of microwave and millimeter wave devices based on liquid crystal materials. It can also be used in the design of liquid crystal microwave devices based on transmission line theory and supernormal medium theory. The antenna designed according to the two methods meets the requirements of radar and satellite communication systems at the level of radiation angle, gain and sidelobe level. It can be used as a good technical reserve in this kind of system.
【學(xué)位授予單位】：哈爾濱工業(yè)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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