Abstract
This paper presents a low-profile dual-band antenna with directional radiation characteristics for wireless local area network (WLAN) applications. The proposed directional antenna is composed of a coupling microstrip line, two F-shaped strips, two rectangular strips, and a defected ground plane. The measured impedance bandwidth of the proposed antenna is 180 MHz (2.33–2.51 GHz) and 830 MHz (5.09–5.92 GHz), which can cover Institute of Electrical and Electronic Engineers (IEEE) 802.11 a/b/g frequency bands. The dual-band antenna exhibits a desirable directional radiation patterns in the vertical and horizontal planes with the peak gain of 6.55 dBi in the lower frequency band and 8.1 dBi in the higher frequency band. The measured antenna efficiency is 70% at 2.4 GHz and 84.5% at 5.5 GHz. The proposed dual-band WLAN station antenna is designed on a FR4 substrate with overall dimensions of 69 mm × 50 mm × 1.6 mm.
Highlights
Nowadays, almost all wireless local area network (WLAN) station antennas show omnidirectional radiation patterns
In order to obtain the directional radiation pattern, there are many methods used in antenna design [3,4]
For the needs of specific systems, some antennas have the characteristics of being low profile, compact and wideband, and have stably directional radiation [5,6,7]
Summary
Almost all wireless local area network (WLAN) station antennas show omnidirectional radiation patterns. In [6], the antenna is based on a modified Vivaldi antenna and characterized by a three-dimensionally bended structure, which performs a stable directional radiation pattern on wideband and is of compact size. A directional slot antenna with a squared arch structure is presented to achieve impedance matching, high gain, and vertical polarization in dual band Wi-Fi unidirectional antenna design [13]. A slot in a ground plane with a complimentary microstrip stub was exploited to design a high-gain directional antenna with high radiation efficiency [14]. Two symmetrical rectangular strips and F-shaped strips are introduced into the ground layer to form good impedance matching, thereby realizing a dual-band antenna. The proposed dual-band antenna exhibits good directional radiation characteristics for wireless local area network (WLAN) applications
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