利用步階式阻抗共振器之多頻與寬頻共平面波導饋入槽孔偶極天線設計;Design of multi-band and broadband CPW-fed slot dipole antennas by using stepped-impedance resonators

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Title:	利用步階式阻抗共振器之多頻與寬頻共平面波導饋入槽孔偶極天線設計;Design of multi-band and broadband CPW-fed slot dipole antennas by using stepped-impedance resonators
Authors:	陳識為;Chen,Shih-wei
Contributors:	電機工程學系
Keywords:	步階式阻抗共振器;槽孔偶極天線
Date:	2012-10-31
Issue Date:	2012-11-12 14:37:48 (UTC+8)
Publisher:	國立中央大學
Abstract:	本文當中利用步階式阻抗共振器(Stepped-Impedance Resonator, SIR)與共平面波導(Coplanar Waveguide, CPW)饋入方式設計兩個多頻天線和一個寬頻天線，天線被設計在板厚1 mm介電常數4.4的FR4基板上，其結構包含一個共平面波導饋入之槽孔偶極天線和寄生的槽孔結構。天線設計上利用步階式阻抗共振器(SIR)取代傳統的均勻阻抗共振器(Uniform-Impedance Resonator, UIR)，產生較傳統均勻阻抗共振器(UIR)更自由的頻率選擇性。雙頻天線和三頻天線都是利用此特性將共振頻率設計在所需要的頻帶上，雙頻天線的頻帶選擇在f0 = 1.5 GHz和fS1 = 3.5 GHz，而三頻天線則是選擇在f0 = 1.5 GHz、fS1 = 3.5 GHz和fS2 = 5.3 GHz；寬頻天線則是將前三個共振頻率設計地很近，以便設計出1.5 GHz到4.4 GHz的6 dB頻寬，頻寬比率是98.7%，由於此種天線在Band 2(fS1 = 3.5 GHz)和Band 3(fS2 = 5.3 GHz)共振時會產生磁流相抵銷的情況，導致輻射場型在Broadside方向會產生null點，本論文在共振器末端加入適當大小的寄生槽孔便可有效改善null點的問題，使得天線的輻射場型可以更加接近全向性。In this thesis two multi-band antennas and a broadband antenna using slot stepped-impedance resonators (SIRs) and coplanar waveguide (Coplanar Waveguide, CPW) feeding have been investigated. All of the proposed antennas are built on a 1-mm FR4 substrate with a relative dielectric constant of 4.4 and loss tangent of 0.02. The purpose of choosing SIR as radiator is due to its more controllable spurious response characteristic in comparison to the conventional uniform-impedance resonator (Uniform-Impedance Resonator, UIR). In this way, dual-band antenna and tri-band antenna are designed at the desired bands. Dual-band antenna is implemented with center frequencies (f0, fS1) = (1.5 GHz, 3.5 GHz), Tri-band antenna is realized with center frequencies (f0, fS1, fS2) = (1.5 GHz, 3.5 GHz, 5.3 GHz), where f0 is the fundamental frequency, and broadband antenna is designed by allocating the first three resonant frequencies close enough to achieve a 98.7% fractional bandwidth with a return loss of greater than 6 dB from 1.5 to 4.4 GHz. Furthermore, to tackle the null problem at the broadside direction of multi-band antenna, parasitic slots are added near the main radiating resonators so as to achieve nearly omni-directional radiation patterns at the high-order mode frequencies.
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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