結合超穎平面與變容二極體之增強型環形開槽天線

An Enhanced Slot Loop Antenna using a Metasurface and Varactors

簡羅斌(Robin Jeanty)

指導教授 ： 陳士元

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2017年)

https://doi.org/10.6342/NTU201700275

摘要

無資料

關鍵字

共振腔天線 ； 槽孔天線 ； 極化可調 ； 波束可調陣列

並列摘要

This thesis will focus on the enhancement of an element from the slot loop antenna family. Slot loop antennas are great candidates for applications requiring low-profile antennas and easy fabrication. However, they are bi-directional which make them incompatible for use in some domains and implies a loss of gain in the unused half-space.
The proposed enhancements will be carried out on a square slot loop antenna which will be designed on the Taiwanese UHF bandwidth [902.75MHz – 927.25MHz]. Two main points will be dealt with in this work. Firstly, the bi-directionality will be solved using the cavity antenna (Fabry-Pérot) technique. This method is an interesting way to also stimulate the gain and to broaden the bandwidth.
Then, the polarization reconfigurability will be the main focus in order to further develop the cavity antenna mentioned earlier. Phase shifters involving coupled lines and varactors will be used to ensure a continuous 360° phase tunability. This phase shifter is compact and optimized for low insertion loss. By changing the biasing of the varactors, the cavity antenna’s polarization will be able to switch continuously between linear, elliptical and circular polarization.
The final chapter will investigate the performance of the cavity antenna in a 3-element phased array. The pattern reconfigurability limitations will be discussed as well as the design choices. The phase tuning will be managed by the same 360° phase shifter involved in the polarization reconfigurability antenna.
Index terms – Fabry-Pérot antennas, slot loop antenna, polarization reconfigurable, phased array, beam steering array

並列關鍵字

Fabry-P&eacute ； rot antennas ； slot loop antenna ； polarization reconfigurable ； phased array ； beam-steering array

參考文獻

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[7] C. Rakluea, S. Chaimool, P. Rakluea and P. Akkaraekthalin, “Unidirectional CPW-fed Slot Antenna Using Metasurface”, in Proc. ECTI-CON, pp. 184-187, May 2011.

[9] G. von Trentini, “Partially Reflecting Sheet Arrays”, IRE Trans. Antennas Propag., vol. AP-4, pp. 666-671, October 1956.