Cylindrical Dielectric Resonator Antenna for Wireless Local Area Networks

[[abstract]]介質共振器天線由於本身具有相當高的介電常數，致使其在同樣的操作頻率下，體積可以比微帶天線更加小型化，加上介質共振天線擁有共振腔的特性，讓天線本身在體積縮小的情況下，依舊保有一定的頻寬與增益，這也是介質共振天線即使在需要額外的共振器材料成本，卻依然保有一席之地的原因。 本研究提出可應用於無線區域網路之圓柱介質共振天線，介質共振器為參雜部分濃度氧化鋁的陶瓷材料，其介電常數約為 9.8，所設計之介質共振天線之頻率操作能涵蓋無線區域網路的高頻段，如 5.15 GHz 至 5.35 GHz 以及 5.725 GHz 至 5.825 GHz 等範圍。介質共振天線以微帶線饋入並藉由一長形槽孔來激發圓柱共振器的模態，槽孔本身並不做為輻射的元件。經過計算，共振器激發模態為 HE11。最終，本研究所提出的介質共振天線之阻抗頻寬為 19.5% (4.86 - 5.91 GHz)，最大增益為 6.49 dBi，輻射場型為正 z 方向，所設計之天線能夠涵蓋及應用於 WLAN 頻段。[[abstract]]Dielectric resonator antenna with itself has quite high dielectric constant. Thus cause under the same operating frequency. The volume can be better than a microstrip antenna miniaturization. Coupled with dielectric resonator antenna has the characteristics of the resonant cavity. Let the antenna itself under the condition of the smaller, still retain a certain amount of bandwidth and gain. It also the reason why still remain, even if in need of additional cost. This study proposed cylindrical dielectric resonator antenna can be applied to wireless LAN. The material of the dielectric resonator is a kind of ceramics that mix up part of the concentration of alumina. Its dielectric constant is about 9.8. The frequency operation band of the proposed design can cover the high band of wireless local area networks, such as 5.15 GHz to 5.35 GHz and 5.725 GHz to 5.825 GHz range. This Dielectric resonator antenna fed by microstrip line and through a long slot to excite cylindrical resonator modes, and slot itself is not as a radiation element. After calculation, the resonator for HE11 mode.In the end, The impedance bandwidth of proposed antenna is 19.5% (4.86 to 5.91 GHz) and A peak gain of 6.49 dBi are obtained. Antenna radiation pattern traveling in the positive z direction. This design of antenna can cover and applied to WLAN band.[[note]]碩