寬頻小型化天線設計及在生物醫學之應用

Design of Miniaturized Wide-band Antennas and which in Biotelemetry Applications

葉峰銘(Feng-Ming Yeh)

指導教授 ： 劉文忠

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(2008年)

摘要

無線通訊產業的迅速發展對於人類生活便利性的提升有極大的幫助，而通訊產品的品質則深受天線效率之影響。如何設計出具有實際應用價值的天線，尤其是對於天線整體結構的縮小化，為目前通訊產業常須克服的關鍵問題。因此，本論文主要以小型化天線結構作為設計目標，提出了三種可應用於不同頻帶之小型天線結構，且都具有寬頻操作之功能。
首先第一個研究主題為小型化寬頻短路式共平面波導饋入型單極天線設計。主要利用共平面波導饋入的技術，設計出一短路式的天線結構，使天線達到可寬頻操作的效果，整體頻寬可達3.21 GHz (4.29∼7.5 GHz)，應用範圍涵蓋5.2及5.8 GHz的無線區域網路頻段，並分析短路接地面對於整體天線頻寬之影響。第二個研究主題為小型化雙寬頻狹縫式共平面波導饋入型單極天線設計。利用在方型貼片上嵌入兩條狹窄槽帶來設計出一非對稱的共平面波導饋入型天線結構，使天線尺寸縮小至24 × 25 mm2，並探討接地面上所延伸出之倒「L」及帶狀導體結構與鄰近槽孔間的耦合效應，藉此增加阻抗頻寬及使天線達到雙頻操作之功能。得到之低、高頻段頻寬分別為370 MHz及4.13 GHz，適用於國際行動電信(IMT)-2000, 5.2/5.8 GHz無線區域網路及5.8 GHz射頻辨識(RFID)系統。最後一個研究主題則提出了一個可應用於生物醫學通訊之小型化植入式寬頻天線設計。此天線結構採用高介電係數基板，並利用螺旋及嵌入槽帶的技巧來達到天線小型化之目的，得到之天線為三層同軸探針饋入式結構，整體天線尺寸僅為10 × 10 × 1.905 mm3，模擬及實測皆顯示此一設計能在403 MHz附近產生一高阻抗頻寬，可操作頻率範圍涵蓋了植入式生醫通訊裝置(MICS)規範所需之頻帶。

關鍵字

寬頻 ； 共平面波導饋入 ； 單極天線 ； 無線通訊 ； 雙頻 ； 第三代行動通訊系統 ； 無線區域網路 ； 小型化 ； 可植入式天線 ； 平面倒F結構 ； 生醫通訊 ； 植入式生醫通訊裝置

並列摘要

There is great benefit to the improvement of human’s life from the rapid development on the wireless communication industry. Performance of the wireless communication devices is seriously affected by functions of an antenna. Design of an antenna with a compact size suitable for integration to various communication systems use has become a real challenge to the antenna researchers. For this, this thesis regards miniaturization of antenna structure with a wide operation band and good radiation performance as the design objective and then proposes three compact antenna designs for applying to different frequency bands.
The first research topic is to design a compact coplanar waveguide (CPW)-fed shorted monopole antenna for broadband operation. The technology of CPW-fed is applied to design the shorted antenna structure for achieving wide-band operation. Effect of the impedance bandwidth caused by the shorted ground is analyzed and finally, the proposed antenna is found to produce a wide bandwidth of 3.21 GHz (4.29∼7.5 GHz), covering the 5.2/5.8 GHz wireless local area network (WLAN) operations. The second research topic is focused on designing a compact CPW-fed slotted monopole antenna for dual- and wide-band operation. By properly embedding slots into a rectangular patch, the designed antenna with only 24 × 25 mm2 in size can lead to good impedance matching in dual bandwidths of 370 MHz and 4.13 GHz respectively, covering IMT-2000, 5.2/5.8 GHz WLAN, and 5.8 GHz RFID operations. The third research topic is to design a miniaturized implantable broadband antenna for biotelemetry communication application. By properly arranging a rectangular three-layer slotted patch structure, the designed antenna with only 10 × 10 × 1.9 mm3 can provide a -10 dB impedance bandwidth of 50 MHz in the 402-405 MHz medical implant communication service (MICS) frequency band.

並列關鍵字

broadband ； CPW-fed ； monopole antenna ； wireless communication ； dual-band ； IMT-2000 ； WLAN ； compact ； implantable antenna ； PIFA ； biotelemetry communication ； MICS

參考文獻

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