共面波導饋入式單極天線設計

Designs of CPW-fed Monopole Antennas

高鈵騏(Ping-Chi Kao)

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所/碩士(2006年)

摘要

近年來，無線通訊網路的快速發展，已對人類日常生活之便利性作了極大的提昇。而無線通訊網路裝置中之天線元件的尺寸大小與輻射特性對於網路裝置間之傳收效益有極為重要之影響。因此，設計一個天線使具適當頻帶並且有體積小、結構簡單、製作容易等特性，使無線通訊網路裝置具更高度之行動性，為本研究之主要目的。
本論文研究主要為可應用在無線通訊系統之平面印刷天線設計，包括利用共面波導（coplanar waveguide；CPW）訊號饋入方式具有僅需單層導體層之特點所設計出之三種具不同阻抗特性的平面印刷天線及一種採用探針訊號饋入方式所設計得到之具圓極化操作特性的平面印刷天線。研究成果包含（1）具超寬頻帶（ultra-wideband；UWB）操作特性之倒三角型輻射片共面波導饋入平面天線；（2）具超寬頻且有濾頻（band notching）功能之倒三角型槽孔式輻射片共面波導饋入平面天線；（3）可應用於射頻辨識（radio frequency identification；RFID）系統的雙摺疊微帶線（folded-strip）小型共面波導饋入天線；及（4）在正方型輻射貼片（patch）邊緣鑿槽孔，使產生圓型極化輻射特性之同軸饋入式平面天線設計。所提出之天線設計的電腦模擬分析、實物製作及實驗量測結果包括阻抗匹配頻寬、輻射場型及天線增益（antenna gain）等，都將在本論文中作詳細之陳述與探討。

並列摘要

In recent years, the fast development of the wireless communication network has already provided much convenience to human being’s livings. The size and radiation characteristic of an antenna embedded in a wireless communication network will thus apparently affect the transceiving efficiency of the communication devices. Therefore, design of an antenna with suitable operating band, sufficient bandwidth, compact size, simple structure, and easy implementation for improving the mobility of a wireless communication device becomes the purpose of this study.
The subject of this thesis is design of planar printed antennas for application to wireless communication systems. Two feed techniques of coplanar waveguide（CPW）feed and probe feed are utilized in this research to design three CPW-fed antennas with different impedance characteristics and one probe-fed antenna with circular-polarization characteristic. These proposed antenna designs include（1）a CPW-fed inverted triangular patch antenna for ultra-wideband operation（2）a CPW-fed inverted triangular patch antenna with a frequency band notch function for ultra-wideband operation（3）a compact CPW-fed dual folded-strip monopole antenna for 5.8 GHz RFID application, and（4）a square slotted patch antenna for circular polarization. The theoretical simulation, implementation of antenna prototypes, and measurement of antenna characteristics including impedance bandwidth, radiation patterns, and antenna gain, are all detailedly described and discussed in this thesis.

參考文獻

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