以倒F型平面天線方式設計雙頻手機天線

近來行動通訊系統,包括全球行動通訊系統 GSM(880~960MHz),數位通訊系統(DCS:1710~1880MHz)已經非常普遍且受到歡迎。雙頻小型化天線在現今的行動電話中也已經是基本要求。這篇論文的目的,是要設計及研究雙頻小型化的內建式手機天線。論文中所採用的是平面式倒F型天線,這種天線與一般傳統外接式天線相比,具有減少對使用者輻射以及可增加機構可靠度的優點;主要的缺點是頻寬比較小。論文的另一個主題是要增加天線的頻寬。有幾種方法可以增加頻寬: 多階共振,使用高介電常數的材質,使用晶片電阻。我們所採用的是多階共振來增加GSM頻段的頻寬。最後量測到的頻寬在低頻段有141MHz(850MHz~981MHz) ,高頻段有211MHz(1701MHz~1912MHz)。已經包含到GSM 頻段(880MHz~960MHz) and DCS 頻段(1710MHz~1880MHz)。我們所設計的這個天線結構簡單,容易製造,成本比採用高介電常數材質的天線低。

關鍵字

多階共振；頻寬；平面式倒F型天線；行動電話；小型化天線；雙頻；數位通訊系統；全球行動通訊系統

並列摘要

Recently, mobile communication systems, including the global system for mobile communication (GSM: 880~960MHz), the digital communication system (DCS:1710~1880MHz), have become very popular. Dual-band and compact antennas are required for nowadays’ mobile cellular phone. The purpose of this thesis is to design and study a dual-band, compact internal mobile cellular phone antenna. Planar Inverted-F antenna is applied in this thesis. It provides advantages over traditional external whip and helix antennas in terms of decreased radiation towards the user, and increased mechanical reliability. The main disadvantage is their narrow impedance bandwidth. The second major topic in this thesis is bandwidth enhancement. There are several techniques to broaden the bandwidth: multiple resonance, using high permittivity material, attaching chip resistor. We use multiple resonance for GSM band bandwidth enhancement. The measured impedance bandwidth at lower band is 141MHz (850MHz~981MHz) and the higher band is 211MHz(1701MHz~1912MHz). Which cover GSM band (880MHz~960MHz) and DCS band (1710MHz~1880MHz). The antenna structure that we proposed in this thesis is simple. It is easy to fabricate and the cost is lower than some high permittivity material.

並列關鍵字

Compact Antenna ； DCS ； Dual-band ； GSM ； Helix Anten ； Mobile communication systems ； PIFA ； Radiation Pattern

參考文獻

[1] Kin-Lu Wong, “Planar Antennas for Wireless Communications “.

[2] P. Eratuuli, P. Haapala, and P. Vainikainen, “Dual Frequency Wire Antennas,”Electron. Lett., Vol. 32, pp. 1051-1052, June 1996.

[3] Koichi Ogawa and Tomoki Uwano, “A Diversity Antenna for Very Small 800-MHz Band Portable Telephones”, IEEE Transactions on Antennas and Propagation, Vol. 42. NO. 9, September 1994.

[4] Zi Dong Liu, Peter S. Hall, Senior Member, IEEE, and David Wake, “Dual-Frequency Planar Inverted-F Antenna “, IEEE Transactions on Antennas and Propagation, Vol. 45, NO. 10, October 1997.

[5] Wong, K.-L. , and Lin, Y.-F. “Small Broadband Rectangular Microstrip Antenna with Chip-resistor Loading” , Electron. Lett., 1997,33,(19), pp. 1593-1594

國際替代計量

以倒F型平面天線方式設計雙頻手機天線

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