可調式枝幹耦合器與寬頻天線設計

Design of Tunable Branch-Line Coupler and Wideband Antenna

李承遠(Cheng-Yuan Lee)

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

本論文分為兩個部分。第一部分提出可調式枝幹耦合器設計，使用變容二極體以達成頻帶可調之特性，並隨著中心頻率的改變，維持良好的振幅差以及相位差。
第二部分為寬頻天線設計，利用共平面波導的方式進行饋入，並使用四個步階式槽線產生額外諧振點以達到寬頻的特性。
本論文所設計的電路，使用全波電磁模擬軟體IE3D以及HFSS進行模擬輔助，並實際製作出電路進行量測，將量測結果與軟體之模擬進行比較之後，驗證兩者具有良好的一致性。

關鍵詞-可調式枝幹耦合器、變容二極體、共平面波導、寬頻天線。

關鍵字

共平面波導 ； 變容二極體 ； 可調式枝幹耦合器 ； 寬頻天線

並列摘要

This thesis includes two parts. The first part is design of tunable branch-line coupler based on varactor diodes. By ultilizing varactor diodes on the four corners of branch-line couper, tunable operating band is achieved with good amplitude and phase difference within operating band.
Second part is design of wideband antenna with CPW feed. In order to reach wideband characteristic, four stepped impedance resonator slots which produce additional resonance points are applied to the patch antenna.
All the circuits in this thesis are simulated with full-wave electromagnetic simulator, and the circuits have been fabricated and measured. The matched results between electromagnetic simulation and measurement can demonstrate the availability of all proposed circuits.

Keywords – tunable branch-line coupler, varactor, CPW, wideband antenna.

並列關鍵字

CPW ； varactor ； tunable branch-line coupler ； wideband antenna

參考文獻

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[2] J. Wang, B. Z. Wang, Y. X. Guo, L. Ong, and S. Xiao, “A compact slow-wave microstrip branch-line coupler with high performance,” IEEE Microw. Wireless Compon. Lett., vol. 17, no. 7, pp. 501–503, Jul. 2007.

[3] S. Karimian, Z. Hu, and M. A. Abdalla, “Compact half-wavelength metamaterial stepped impedance resonator (SIR),” in IEEE Int. Antennas and Propagation (APSURSI), pp. 2951–2953, Jul. 2011.

[4] J. Reed and G. J. Wheeler, “A method of analysis of symmetrical four-port networks,” IRE Trans. Microw. Theory Tech., vol. 4, no. 4, pp. 246–252. Oct. 1956.

[5] R. Levy and L. Lind, “Synthesis of symmetrical of branch-guide directional couplers,” IEEE Trans. Microw. Theory Tech., vol. 19, no. 2, pp. 80–89, Feb. 1968.