本文選題：電磁帶隙結(jié)構(gòu) + 雙極化輻射單元��； 參考：《華南理工大學(xué)》2014年碩士論文

【摘要】：基站天線是移動通信系統(tǒng)的重要組成部件，其性能的優(yōu)劣直接影響移動通信網(wǎng)絡(luò)的覆蓋質(zhì)量。隨著基站天線應(yīng)用的深入，基站天線的寬帶化、電調(diào)化和多系統(tǒng)共用趨勢對基站天線的小型化提出了更高的要求，實(shí)現(xiàn)基站天線小型化的重點(diǎn)和難點(diǎn)是輻射單元剖面高度的降低。電磁帶隙（electromagnetic bandgap: EBG）結(jié)構(gòu)在某些頻段上具有同相反射相位特性，若將其作為輻射單元的地平面，能夠從根本上降低輻射單元的剖面高度。 本文致力于降低振子輻射單元剖面高度方法的研究，首先講述了電磁帶隙結(jié)構(gòu)的發(fā)展概況、同相反射相位和表面波帶隙特性及其仿真和測量方法，以及電磁帶隙結(jié)構(gòu)的在基站天線中的應(yīng)用現(xiàn)狀。接著，從經(jīng)典的mushroom（蘑菇）形式EBG結(jié)構(gòu)出發(fā)，本文設(shè)計(jì)了一種具有較大反射相位帶寬的EBG結(jié)構(gòu)（DD-EBG）,并研究設(shè)計(jì)了結(jié)合DD-EBG結(jié)構(gòu)和振子的一體化設(shè)計(jì)方法，，一體化設(shè)計(jì)方法兼顧了EBG結(jié)構(gòu)和振子間的相互影響，并且弱化了設(shè)計(jì)過程對仿真軟件的依賴，使得設(shè)計(jì)過程趨于系統(tǒng)化和模式化。利用該方法計(jì)算出使得降低高度后的振子性能最佳的EBG結(jié)構(gòu)尺寸，同時(shí)，本文進(jìn)一步縮小EBG結(jié)構(gòu)地平面尺寸并為振子重新設(shè)計(jì)巴倫結(jié)構(gòu)，最后通過對EBG結(jié)構(gòu)通孔尺寸的研究進(jìn)一步優(yōu)化振子性能，得到相對于原來振子降低了一半高度的加載EBG結(jié)構(gòu)振子模型。 對所設(shè)計(jì)的EBG結(jié)構(gòu)和振子模型制作了樣機(jī)并進(jìn)行測試，測試結(jié)果顯示：在1.85-2.5GHz頻段內(nèi)，振子的駐波比小于1.6，隔離度高于25dB，增益值大于7.5dBi,水平面和垂直面的波束寬度在66.5-76.5度之間，前后比在20-27dB之間，-60度至60度的交叉極化比大于13dB，基本能夠滿足移動通信對基站天線的使用要求。最后，本文將所設(shè)計(jì)的一體化設(shè)計(jì)方法推廣到其它兩種基站天線輻射單元中，在將兩者降低剖面高度的同時(shí)保持性能優(yōu)異，證明了所設(shè)計(jì)方法在基站天線輻射單元中的普遍適用性，具有工程指導(dǎo)意義和實(shí)際使用價(jià)值。
[Abstract]:Base station antenna is an important component of mobile communication system. Its performance directly affects the coverage quality of mobile communication network. With the deepening of base station antenna application, the broadband, electromodulation and multi-system common trend of base station antenna put forward higher requirements for the miniaturization of base station antenna. The key and difficult point to realize the miniaturization of base station antenna is to reduce the height of radiating unit profile. The electromagnetic band gap (EBG) structure has the phase characteristics of in-phase reflection in some frequency bands. If it is used as the ground plane of the radiation unit, the height of the section of the radiation unit can be fundamentally reduced. This paper is devoted to the study of the method of reducing the height of radiator section. Firstly, the development of electromagnetic band gap structure, the characteristics of in-phase reflection phase and surface wave band gap, and their simulation and measurement methods are described. And the application status of electromagnetic band gap structure in base station antenna. Then, starting from the classic mush room-EBG structure, this paper designs a kind of EBG structure with large reflection phase bandwidth, and studies and designs an integrated design method combining DD-EBG structure and oscillator. The integrated design method takes into account the interaction between the EBG structure and the oscillator, and weakens the dependence of the design process on the simulation software, which makes the design process more systematic and stylized. By using this method, the structure size of EBG structure is calculated, which makes the oscillator with the best performance after lowering the height. At the same time, the plane size of the EBG structure is further reduced and the Barron structure is redesigned for the oscillator. Finally, by studying the size of the through hole of the EBG structure, the oscillator performance is further optimized, and the loaded EBG oscillator model is obtained, which is half the height of the original oscillator. A prototype of the designed EBG structure and oscillator model is made and tested. The results show that in the frequency range of 1.85-2.5GHz, the standing wave ratio of the oscillator is less than 1.6, the isolation degree is higher than 25dB, the gain value is greater than 7.5 dBi.The beam width of horizontal plane and vertical plane is between 66.5-76.5 degrees. The cross-polarization ratio between 20-27dB and between 60 and 60 degrees is more than 13dB, which can basically meet the requirements of mobile communication for base station antenna. Finally, the integrated design method is extended to the other two kinds of base station antenna radiating units, which can reduce the height of the two base station antennas and maintain excellent performance at the same time. It is proved that the design method is applicable to the radiating unit of base station antenna and has engineering guiding significance and practical application value.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN828.6

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本文編號：2021559