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Abstract
A compact planar J-pole antenna applied to WLAN routers and access points (AP) is presented in this paper. The proposed antenna adopts the planar J-shaped structure, which comprises a meander radiator and a matching stub. The size can be reduced by using the meander structure of the radiator, and the impedance matching can be obtained by adjusting the feed point position on matching stub. The proposed antenna is realized by using a planar structure, which makes it suitable for aesthetic design. A prototype of the antenna is constructed and tested. The experimental results show that the antenna has good performance in its working band. The impedance bandwidth (|S 11| < 10 dB) is 130 MHz (centered at 2.48 GHz), and the radiation patterns are almost omni-directional in the H plane and bidirectional in the E plane. The peak antenna gain is 2.9 dB.