高選擇性環形帶通濾波器與超寬頻天線設計

Design of High Selectivity Ring-Shaped Bandpass Filter and Ultra-Wideband Antenna

劉憬寧(Ching-Ning Liu)

指導教授 ： 湯敬文

國立中正大學/工學院/電機工程學系/碩士(2015年)

摘要

本論文分為兩部份。第一部份為第三章的高選擇性環形帶通濾波器，不同於以增加電路階數來達成電路的高選擇性，而是利用在原來架構中的耦合線開路端多串接開路/短路殘段，使原來電路的傳輸零點個別通帶邊緣移動，進而改善電路的選擇性。利用正規化開路/短路殘段的阻抗調整傳輸零點的位置，並描繪出頻率響應特性取線，因此可快速設計出一個極高選擇性濾波器。最後，使用全波電磁模擬軟體IE3D進行模擬輔助，理論與實作量測有良好的一致性。
第二部份為第四章超寬頻天線設計，在本章節提出兩種方法來增加天線的頻寬，一種為開槽線法、另一種為上下耦合法。兩種方法都可以增加額外的諧振點來達成寬頻的效果。最後使用Ansoft HFSS模擬軟體加以輔助，且模擬結果與實作有良好的一致性

關鍵字

開槽線法 ； 上下耦合法 ； 環形諧振腔 ； 高選擇性濾波器 ； 超寬頻天線

並列摘要

In this thesis, there are two parts presented. In the first part, the high selectivity ring-shaped bandpass filter, which is not use high order to achieve high selectivity response. By using open stub/shorted stubs on the end of coupled line to make transmission zeros shifting to the skirt of the lower/higher passband separately and improve the selectivity. The normalized impedance of open/shorted stubs can be adjusted to the location of the transmission zeros. Furthermore, the characteristic curves of frequency responses are provided to design very high selectivity bandpass filter. Finally, the electromagnetic simulator is utilized to predict result and the results show that simulation and measurement are in good agreement.
In the second part, the ultra-wideband antennas are presented. This chapter provides two ways to improve antenna bandwidth. One is slotted and another is coupled. Both of them can generate extra resonant points to achieve wide band effect. Finally, we use the electromagnetic simulator (Ansoft HFSS) to verify the results. The results also show that simulation and measurement are in good agreement.

並列關鍵字

Coupling ； Ring-shaped Resonators ； High selectivity bandpass filters ； Slot line ； Ultra-wideband antenna

參考文獻

[1] I. Wolff, “Microstrip bandpass filters using degenerate modes of a microstrip ring resonator” Electron. Lett., vol.8, pp.163-164, June 1972.

[2] U. Karacaoglu, I.D. Robertson, and M. Guglielmi, “A dual-mode microstrip ring resonator filter with active devices for loss compensation” IEEE MTT-S Int. Microwave Symp. Digest., pp.189-192, 1993.

[3] J. S. Hong and M. J. Lancaster, “Microstrip bandpass filter using degenerate modes of a novel meander loop resonator” IEEE Microwave and Guided Wave Letters. Vol. 5. NO 11, November 1995.

[4] W.C. Jung, H.J. Park, J.C. Lee, “Microstrip ring bandpass filters with new interdigital side-coupling structure” Asia Pacific Microwave Conf., vol.3, pp.678-681, Dec 1999.

[5] A.C. Kundu, and I. Awai, “Control of attenuation pole frequency of a dual-mode microstrip ring resonator bandpass filter” IEEE Trans. Microwave Theory Tech., vol.49, pp.1113-1117, Nov. 2000.