寬頻介質共振天線之研究與設計

Study of wide-band dielectric resonator antennas

李建泓(Jian-Hong Li)

指導教授 ： 孫卓勳

國立臺北科技大學/電資學院/電腦與通訊研究所/碩士(2009年)

https://doi.org/10.6841/NTUT.2009.00103

摘要

本論文的研究主要為介質共振器天線的設計，利用介質共振器的高介質常數以及高輻射效益…等特性，製作寬頻以及多頻帶操作的介質共振器天線。本論文天線使用共平面波導饋入結構，以帶線來激發出圓柱形介質共振器的混合式電磁場模態。一開始的介質共振器天線只有一個模態，且擁有31%的頻寬比與2.71dbi的最大增益值；其後在接地面上設置一個圓形的槽孔結構，在高頻部分耦合出另外一個模態，與前面的模態結合後可以達到將近57%的頻寬比，兩個模態的最大增益分別是4.2 dBi以及5.7 dBi。另於圓柱型介質共振器的下方加入一個環形帶線，使其在低頻區段耦合出一個模態，頻率落在2.31 GHz，頻寬從2.42 GHz~2.50 GHz，使此介質共振天線形成多頻帶的操作，其頻率範圍可涵蓋全球互通微波存取執照頻段的美國WCA頻段(2.305 GHz~2.320 GHz與 2.345 GHz~2.360 GHz)、國際FWA頻段(3.4 GHz~3.7 GHz)以及免執照頻段的2.4 GHz工醫科/藍芽頻段(2.4 GHz~2.484 GHz)。

關鍵字

介質共振天線

並列摘要

The main scope of this thesis is to study the dielectric resonator antennas with characteristics of greater radiation efficiency for wideband or multiband operations. The feeding structure of the designed antenna is a coplanar waveguide to excite a hybrid electromagnetic mode of the cylindrical dielectric resonator by a strip line. The dielectric resonator antenna exhibits the impedance bandwidth of 31% and maximum antenna gain of 2.71 dBi. A round slot is designed at ground plane to excite another mode of cylindrical dielectric resonator at higher frequency part and achieves an impedance bandwidth of more than 57% by combining with the established mode. the maximum gain of the two modes are about 4.2 dBi and 5.7 dBi, respectively. Finally, a circular strip under the cylindrical dielectric resonator is designed to couple a mode at lower frequency part and enable the multiband operation of the dielectric resonator antenna. The designed multiband dielectric resonator antenna exhibits a coverage of the licensed bands of WCA (2.305 GHz~2.320 GHz and 2.345 GHz~2.360 GHz) band, FWA (3.4 GHz~3.7 GHz) band and unlicensed band of 2.4 GHz ISM band/Bluetooth (2.4 GHz~2.484 GHz) in WiMAX (Worldwide Interoperability for Microwave Access).

並列關鍵字

wide-band dielectric resonator antenna

參考文獻

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