平面印刷小型超寬頻天線之設計與實現

本論文主要是在探討超寬頻單極天線的小型化設計，藉由阻抗匹配的技巧，作為增加天線阻抗頻寬的分析與探討。主要的研究設計方法是先依下邊限頻率公式決定天線輻射體的尺寸，由此得到一個天線的雛形，而後將此天線雛形以HFSS模擬軟體分析檢討後，分別引入阻抗匹配技巧，適時修正天線參數，再將其與實作後的量測作比較，以得到預期性能的較佳化結果。首先，在微帶線超寬頻單極天線的輻射體中和底部，分別蝕刻出長方形槽孔和斜角邊，藉此激發出三個相鄰共振頻率模態，然後在接地面上蝕刻凹槽，可再結合多相鄰共振頻率使其成為較寬的操作頻帶，透過這些阻抗匹配技巧，分別可在微帶線和共平面波導架構下，得到一個足夠大的超寬頻操作頻寬。

關鍵字

超寬頻；單極天線；阻抗匹配；微帶線；共平面波導

並列摘要

This thesis examines the design of a compact-size ultra-wideband monopole antenna, using the technique of impedance matching to increase the impedance bandwidth. In the research design, the size of monopole radiator was determined by the formula of lower edge frequency through which, we obtained a monopole antenna configuration that was subsequently analyzed via HFSS simulation software. Afterwards, we employed the technique of impedance matching and moderately modified the monopole parameter. The newly obtained outcome of this antenna configuration was then compared with our experimental results so as to achieve a final optimal design to function as our anticipation. First, rectangular slot and bevel was individually etched at the middle and bottom of the radiator of microstrip ultra-wideband monopole antenna. Thereupon, the excitation of three adjacent resonant modes would be evoked. Subsequently, we etched a notch on the ground plane and combined the multiple adjacent resonant modes to produce a wider operating band. Using these impedance matching techniques, we were able to obtain a large enough ultra-wideband operating bandwidth under the microstrip and coplanar waveguide structure.

並列關鍵字

ultra-wideband ； monopole antenna ； impedance matching ； microstrip ； coplanar waveguide

參考文獻

[72] X. L. Bao and M. J. Ammann, “Printed UWB Antenna with Coupled Slotted Element for Notch-Frequency Function,” International Journal of Antennas and Propagation, vol. 2008, id. 713921, 7 pages, Jan. 2008.

[82] K. P. Ray, “Design Aspects of Printed Monopole Antenna for Ultra-Wide Band Applications,” International Journal of Antennas and Propagation, vol. 2008, id. 713858, 8 pages, Jan. 2008.

[1] W. P. Siriwongpairat and K. J. R. Liu, Ultra WideBand Communication Systems: Multiband OFDM Approach, John Wiley and Sons Inc, New York, 2008.

[3] Z. N. Chen, Antennas For Portable Devices, John Wiley and Sons, New York Inc, 2007.

[5] K. Fujimoto, Mobile Antenna Systems Handbook, Third Edition, Artech House Inc, Boston, 2008.

國際替代計量

平面印刷小型超寬頻天線之設計與實現

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