Horizontally polarized omnidirectional printed antenna for WLAN applications

被引：129

作者：

Lin, C. -C. ^{[1
]}

Kuo, L. -C. ^{[1
]}

Chuang, H. -R. ^{[1
]}

机构：

[1] Natl Cheng Kung Univ, Inst Comp & Commun Engn, Dept Elect Engn, Tainan 70101, Taiwan

来源：

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 2006年 / 54卷 / 11期

关键词：

Alford loop; HFSS; horizontal polarization; laptop PC; onmidirectional; printed antenna; printed inverted-F antenna (PIFA); WLAN;

D O I：

10.1109/TAP.2006.884307

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The design simulation, fabrication, and measurement of a 2.4-GHz horizontally polarized omnidirectional planar printed antenna for WLAN applications is presented. The antenna adopts the printed Alford-loop-type structure. The three-dimensional (3-D) EM simulator HFSS is used for design simulation. The designed antenna is fabricated on an FR-4 printed-circuit-board substrate. The measured input standing-wave-ratio (SWR) is less than three from 2.40 to 2.483 GHz. As desired, the horizontal-polarization H-plane pattern is quite omnidirectional and the E-plane pattern is also very close to that of an ideal dipole antenna..,Also a comparison with the popular printed inverted-F antenna (PIFA) has been conducted, the measured H-plane pattern of the Alford-loop-structure antenna is better than that of the PIFA when the omnidirectional pattern is desired. Further more, the study of the antenna printed on a simulated PCMCIA card and that inserted inside a laptop PC are also conducted. The HFSS model of a laptop PC housing, consisting of the display, the screen, and the metallic box with the keyboard, is constructed. The effect of the. laptop PC housing with different angle between the display and keyboard on the antenna is also investigated. It is found that there is about 15 dB attenuation of the gain pattern (horizontal-polarization field) in the opposite direction of the PCMCIA slot on the laptop PC. Hence, the effect of the large ground plane of the PCMCIA card and the attenuation effect of the laptop PC housing should be taken into consideration for the antenna design for WLAN applications. For the proposed antenna, in addition to be used alone for a horizontally polarized antenna, it can be also a part of a diversity antenna.

引用

页码：3551 / 3556

页数：6

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