用於第五代行動通訊之類表面電漿微型圓極化槽孔天線;A Miniaturized Circularly Polarized Slot Antenna Based on Spoof Surface Plasmon for 5G Applications

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Title:	用於第五代行動通訊之類表面電漿微型圓極化槽孔天線;A Miniaturized Circularly Polarized Slot Antenna Based on Spoof Surface Plasmon for 5G Applications
Authors:	吳紹妤 Wu, Shao-Yu
Contributors:	電機工程學系
Keywords:	圓極化;槽孔天線;Circular polarization;Slot antenna
Date:	2024-01-03
Issue Date:	2024-09-19 18:04:12 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文將探討慢波結構具有較大的傳播常數之特性，並以此實現天線尺寸的縮小化。且會基於類表面電漿的理論說明天線所激發的色散曲線在接近漸進線的頻率下有圓極化模態，並以此選定天線的操作頻率，最後會用特徵模態分析驗證其理論。第一部分會設計 Sub-6 GHz 頻段中的 2.45GHz 微型圓極化槽孔天線，結合 LC 電路的理論以降低天線的共振頻率，最後成功設計出尺寸僅有 0.09??0 ×0.06??0 的微型圓極化槽孔天線。第二部分則是設計毫米波頻段中的 28GHz 微型圓極化槽孔天線，槽孔的尺寸為 0.07??0 ×0.09??0。第三部分會將 2.45GHz 微型圓極化槽孔天線設計成 1x4 天線陣列，並加上合適的蕈狀結構以增加天線彼此間的隔離度，並且會利用巴特勒矩陣作為饋電網路以達到波束轉換的目的。最後部份則討論了 28 GHz 微型圓極化槽孔天線陣列無法做到圓極化輻射的原因，並且會在未來工作做改善。 ;This paper will utilize the properties of slow-wave structures with larger propagation constants to miniaturize the antenna. The theory of Spoof surface plasmons will be employed to derive the dispersion curve of the antenna, exhibiting circular polarization modes near the asymptotic frequency. The operating frequency of the antenna will be determined based on this, and the theoretical analysis will be validated through characteristic mode analysis. The first part of the paper will design a 2.45 GHz miniaturized circularly polarized slot antenna in the Sub-6 GHz frequency band. The addition of an LC circuit will be used to theoretically lower the resonant frequency of antenna, ultimately resulting in the successful design of a miniaturized circularly polarized slot antenna with dimensions as small as 0.09??0 ×0.06??0. The second part of the paper will design a 28 GHz miniaturized circularly polarized slot antenna in the millimeter-wave frequency band with slot dimensions of 0.07??0 ×0.09??0. In the third part, the 2.45 GHz miniaturized circularly polarized slot antenna will be designed as a 1x4 antenna array, and a suitable mushroom structure will be added to increase the isolation between the antennas. The Butler matrix will be used as a feeding network to achieve beamforming. The last part will discuss the reasons why circularly polarized radiation cannot be achieved in the 28 GHz miniaturized circularly polarized slot antenna array and propose potential improvements for future work.
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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