本文選題：圓極化 + 多頻　； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：使用GPS或者我國(guó)的北斗導(dǎo)航終端設(shè)備都有可能因?yàn)橐馔舛鵁o(wú)法使用導(dǎo)航定位系統(tǒng)。如果終端設(shè)備能同時(shí)兼容這兩套導(dǎo)航定位系統(tǒng),那么就會(huì)大大降低這種風(fēng)險(xiǎn)。而導(dǎo)航終端天線是其不可或缺的一部分,目前市場(chǎng)上面能同時(shí)兼容這兩套導(dǎo)航定位系統(tǒng)的終端天線很少。本文在此基礎(chǔ)之上,結(jié)合科研項(xiàng)目實(shí)際需要,研制了兩款導(dǎo)航終端天線。另外基于項(xiàng)目需要,研制了一款用于單層雙極化平面微帶反射陣的雙極化饋源。首先,在相關(guān)理論基礎(chǔ)之上,研究設(shè)計(jì)了一款是用于車載的四頻導(dǎo)航終端天線,采用多層結(jié)構(gòu),加載空氣腔,以威爾金森和分支線耦合器為饋電網(wǎng)絡(luò),走立體結(jié)構(gòu),采用末端焊接有電容片的探針對(duì)輻射結(jié)構(gòu)耦合饋電,實(shí)現(xiàn)寬頻、多頻(四頻)、高增益的一款車載導(dǎo)航終端天線。使用電磁仿真軟件進(jìn)行仿真設(shè)計(jì)并送出去加工,對(duì)加工回來(lái)的天線進(jìn)行測(cè)試,在BD2-B1與GPS-L1、BD1(Tx)、BD1(Rx)四個(gè)工作頻點(diǎn)上,測(cè)試增益高于6.2 dB,前后比優(yōu)于18.2 dB,20o仰角增益高于-6.3dB,軸比小于1.7dB,端口回波損耗高于17 dB,端口之間隔離度優(yōu)于11.5dB。測(cè)試結(jié)果與仿真結(jié)果比較吻合,滿足工程需要。其次,在上一款天線基礎(chǔ)上,結(jié)合工程要求,設(shè)計(jì)了一款是用于手持終端的四頻導(dǎo)航終端天線。采用雙層結(jié)構(gòu),加載感性銷釘,外方環(huán)內(nèi)套有方形貼片的輻射結(jié)構(gòu),以耦合器芯片與威爾金森功分器連接末端焊接有電容片的探針作為饋電網(wǎng)絡(luò),以此實(shí)現(xiàn)多頻、小型化,低仰角增益。經(jīng)過(guò)理論分析,使用電磁軟件仿真計(jì)算,加工制作了此款天線,并對(duì)其測(cè)試。在BD2-B1與GPS-L1、BD1(Tx)、BD1(Rx)四個(gè)工作頻點(diǎn)上,測(cè)試增益高于3.4 dB,前后比優(yōu)于13.5 dB,20o仰角增益高于-5dB,軸比小于2.8dB,三個(gè)端口各自回波損耗優(yōu)于14dB,端口之間的隔離度高于11.5dB,測(cè)試與仿真比較吻合,基本滿足工程設(shè)計(jì)要求。最后,基于項(xiàng)目需要,設(shè)計(jì)了一款雙極化饋源,采用雙耦合接入的正交膜耦合器進(jìn)行雙極化信號(hào)的隔離與混合,端接正交膜耦合器的多模喇叭用作偏饋饋源,對(duì)單層雙極化平面微帶反射陣進(jìn)行饋電。結(jié)合理論與仿真計(jì)算,制作了饋源實(shí)物,并對(duì)其測(cè)試,測(cè)試結(jié)果表明,在工作頻段(31-33GHz)內(nèi),饋入的耦合端口的反射系數(shù)均小于-10dB,兩饋電端口之間的隔離度大于40dB,插損小于1dB,增益高于13.5 dB,10 dB波束寬度大于72o,測(cè)試與仿真結(jié)果吻合,且很好的滿足了工程要求。
[Abstract]:The use of GPS or our country's Beidou navigation terminal equipment may be accidental and unable to use the navigation and positioning system. If the terminal equipment is compatible with both sets of navigation and positioning systems, the risk will be greatly reduced. The navigation terminal antenna is an indispensable part of the system. At present, few terminal antennas are compatible with these two navigation and positioning systems on the market. Based on this, two navigation terminal antennas are developed according to the actual needs of scientific research projects. In addition, a double polarization feed is developed for single layer dual polarized planar microstrip reflectors. First of all, on the basis of related theory, a four-frequency navigation terminal antenna used in vehicle is designed. It adopts multi-layer structure, loads air cavity, takes Wilkinson and branch coupler as feed network, and walks stereoscopic structure. A wideband, multi-frequency (four-frequency), high-gain antenna for vehicle navigation terminal is realized by coupling the radiation structure with a probe with a capacitor chip welded at the end of the paper. The electromagnetic simulation software is used to simulate the design and to be sent out for processing. The processed antennas are tested at the four working frequency points of BD2-B1 and GPS-L1N BD1TxTX / BD1 / Rx, and the results are as follows: (1) the electromagnetic simulation software is used to carry out the simulation design, and the processed antenna is tested. The measured gain is higher than 6.2 dB, the forward / backward ratio is better than -6.3dB, the axial ratio is less than 1.7dB, the return loss is more than 17 dB, and the isolation between ports is better than 11.5dB. The test results are in good agreement with the simulation results and meet the engineering needs. Secondly, based on the above antenna and the engineering requirements, a four-frequency navigation terminal antenna for handheld terminal is designed. Using double layer structure, loaded inductive pin, square patch inside the outer ring, using coupler chip and Wilkinson splitter to connect the end of the probe with capacitor as feed network, so as to realize multi-frequency and miniaturization. Low elevation gain. After theoretical analysis, the antenna is fabricated and tested by electromagnetic software simulation. At the four operating frequency points of BD2-B1 and GPS-L1TX TX, the test gain is higher than 3.4 dB, the back to back ratio is better than 13.5 dB, the axial ratio is less than 2.8 dB, the return loss of the three ports is better than 14 dB, and the isolation between ports is higher than 11.5 dB. The test results are in good agreement with the simulation results. Basically meet the requirements of engineering design. Finally, based on the project requirements, a dual-polarization feed is designed. The dual-polarization signal is isolated and mixed by a dual-coupled quadrature film coupler, and the multi-mode horn connected with the orthogonal membrane coupler is used as the feed. A single layer double polarized planar microstrip reflection array is fed. Combined with the theory and simulation calculation, the feed material is made and tested. The test results show that, in the working frequency band of 31-33 GHz, The reflection coefficient of the fed coupling port is less than -10 dB, the isolation between the two feed ports is more than 40 dB, the insertion loss is less than 1 dB, the gain is higher than 13.5 dB and 10 dB beam width is larger than 72 o. the test results are in good agreement with the simulation results and well meet the engineering requirements.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN965.2

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 楊增輝;北斗衛(wèi)星導(dǎo)航系統(tǒng)車載天線研究[D];南京航空航天大學(xué);2010年

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本文編號(hào)：1948413