發(fā)布時(shí)間：2018-06-25 18:45

  本文選題：移動(dòng)終端天線 + 衛(wèi)星終端天線��； 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：近年來(lái),隨著移動(dòng)通信技術(shù)的飛速發(fā)展,對(duì)于應(yīng)用于移動(dòng)通信系統(tǒng)中的天線的要求也越來(lái)越高。如今的移動(dòng)通信設(shè)備的發(fā)展趨勢(shì)趨向于小型化,超薄化,多功能化,這不僅增加了天線周圍電磁環(huán)境的復(fù)雜性,而且還要求天線能覆蓋更多的頻段。所以目前在移動(dòng)終端天線的設(shè)計(jì)中更多的強(qiáng)調(diào)了天線多頻化,多極化特性和天線的小型化特性。在本文中,針對(duì)移動(dòng)終端系統(tǒng)領(lǐng)域中不同用途的天線的多頻化,多極化,小型化,以及多天線系統(tǒng)中天線的性能和隔離度等進(jìn)行了討論和研究:1、設(shè)計(jì)了一款雙頻雙極化的北斗一代衛(wèi)星導(dǎo)航天線,用兩層介質(zhì)板重疊的方式實(shí)現(xiàn)了天線的雙頻雙極化,上下兩層介質(zhì)板用的都是最常見的FR4基板,介電常數(shù)為4.4,厚度都為1mm,此北斗一代天線在發(fā)射頻段(1611-1621MHz)和接收頻段(2487-2497MHz)內(nèi)的S參數(shù)滿足要求,發(fā)射天線采用了左旋圓極化的極化方式,接收天線采用了右旋圓極化的極化方式,滿足“北斗一代”衛(wèi)星天線的極化要求。通過(guò)測(cè)試結(jié)果可以看出天線的仿真結(jié)果和實(shí)測(cè)結(jié)果吻合良好,天線具有良好的遠(yuǎn)場(chǎng)輻射特性,而且兩天線的隔離度良好,耦合較小。2、設(shè)計(jì)了一款結(jié)構(gòu)緊湊簡(jiǎn)單、低剖面的微帶超寬帶(UWB)天線。通過(guò)把頻率選擇表面(FSS)結(jié)構(gòu)加載到微帶超寬帶天線的矩形口徑縫隙中的方法,使得超寬帶天線在3.15-3.85GHz,5.4-6GHz和7.8-9.3GHz這三個(gè)頻段產(chǎn)生了帶阻特性,有效的抑制了超寬帶頻段和全球微波接入頻段(WiMAX),無(wú)線局域網(wǎng)絡(luò)(WLAN)和衛(wèi)星通訊中的X頻段之間產(chǎn)生的電磁干擾。天線的整體尺寸為330′35′1.5mm。通過(guò)測(cè)試結(jié)果可以看出天線的仿真結(jié)果和測(cè)試結(jié)果吻合良好,天線在非陷波頻段具有良好的遠(yuǎn)場(chǎng)輻射特性和效率,適合用于移動(dòng)通信系統(tǒng)。3、設(shè)計(jì)一款應(yīng)用于3G/4G通信的無(wú)線局域網(wǎng)外置天線,該天線可以覆蓋700-960MHz和1710-2700MHz的3G/4G頻段,采用結(jié)構(gòu)比較緊湊簡(jiǎn)單,易于加工的平面單極子天線(Monopole Antenna)。通過(guò)實(shí)測(cè)特性可以看出該外置天線的仿真特性和實(shí)測(cè)特性吻合良好,同時(shí)具有良好的遠(yuǎn)場(chǎng)輻射特性。4、設(shè)計(jì)一個(gè)包含多個(gè)天線的對(duì)講機(jī),此對(duì)講機(jī)的外置天線是根據(jù)之前提出的用于3G/4G通信的無(wú)線局域網(wǎng)外置天線進(jìn)行改進(jìn)的,同時(shí)設(shè)計(jì)了對(duì)講機(jī)天線系統(tǒng)中的內(nèi)置主天線,GPS天線和Wi-Fi天線。其中外置天線可以覆蓋380-400MHz,400-470MHz,1447-1467MHz,1785-1805MHz,2300-2400MHz等五個(gè)頻段;內(nèi)置主天線可以覆蓋791-960MHz,1447-1467MHz,1710-2170MHz三個(gè)頻段;內(nèi)置GPS天線可以覆蓋1572-1578MHz頻段,Wi-Fi天線可以覆蓋2400-2500MHz的WLAN頻段。通過(guò)測(cè)試結(jié)果可以看出天線的仿真結(jié)果和測(cè)試結(jié)果吻合良好,具有良好的遠(yuǎn)程輻射特性,而且多天線系統(tǒng)中各天線的耦合較小,滿足對(duì)隔離度的要求。
[Abstract]:In recent years, with the rapid development of mobile communication technology, the requirement of antenna used in mobile communication system is becoming higher and higher. Nowadays, the development trend of mobile communication equipment tends to be miniaturization, thinning and multifunction, which not only increases the complexity of the electromagnetic environment around the antenna, but also requires the antenna to cover more frequency bands. So in the design of mobile terminal antenna, more emphasis is placed on antenna multi-frequency, multi-polarization and antenna miniaturization. In this paper, aiming at the multi-frequency, multi-polarization and miniaturization of antennas for different applications in the field of mobile terminal systems, The performance and isolation of the antenna in the multi-antenna system are discussed and studied. A dual-frequency dual-polarization Beidou satellite navigation antenna is designed. The dual-frequency dual-polarization antenna is realized by overlapping the two layers of dielectric plates. The upper and lower layers of the dielectric plate are the most common FR4 substrate with a dielectric constant of 4.4 and a thickness of 1 mm. The S parameters of the Beidou generation antenna in the transmitting band (1611-1621MHz) and the receiving band (2487-2497MHz) meet the requirements. The receiving antenna adopts the polarization mode of right-handed circular polarization, which meets the polarization requirements of the Beidou generation satellite antenna. It can be seen from the test results that the antenna simulation results are in good agreement with the measured results. The antenna has good far-field radiation characteristics, and the isolation of the two antennas is good, the coupling is small. 2. A compact and simple structure is designed. Low profile microstrip ultra-wideband (UWB) antenna. By loading the frequency selective surface (FSS) structure into the rectangular aperture slot of the microstrip UWB antenna, the bandstop characteristics of the UWB antenna are obtained in the frequency bands of 3.15-3.85 GHz 5.4-6 GHz and 7.8-9.3 GHz. The electromagnetic interference between UWB band and global microwave access band (WiMAX), wireless local area network (WLAN) and X band in satellite communication is effectively suppressed. The overall size of the antenna is 330g / 35m and 1.5mm. It can be seen from the test results that the antenna simulation results are in good agreement with the test results. The antenna has good far-field radiation characteristics and efficiency in the non-notch frequency band. Suitable for mobile communication system .3. design a wireless LAN external antenna for 3G / 4G communication. The antenna can cover 700-960MHz and 1710-2700MHz 3G / 4G band. It adopts a compact and simple planar monopole Antenna). It can be seen that the simulation characteristics of the external antenna are in good agreement with the measured characteristics. At the same time, the external antenna has good far-field radiation characteristics .4. a walkie-talkie with multiple antennas is designed. The external antenna of the walkie-talkie is improved according to the wireless LAN external antenna proposed previously for 3G / 4G communication. At the same time, the built-in main antenna GPS antenna and Wi-Fi antenna in the interphone antenna system are designed. The external antenna can cover five frequency bands, such as 380-400MHz, 400-470MHz, 1447-1467MHz, 1785-1805MHz, 2300-2400MHz, etc., the built-in main antenna can cover three bands, 791-960MHzn1447-1467MHz, 1710-2170 MHz, and the built-in GPS antenna can cover 1572-1578MHz band WLAN band, 2400-2500MHz WLAN band. It can be seen from the test results that the antenna simulation results are in good agreement with the test results, and have good long-range radiation characteristics, and the coupling of the antennas in the multi-antenna system is small, which meets the requirements of isolation.
【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
【分類號(hào)】：TN828.6

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