Compact dual-band rectangular ring printed antenna for WLAN applications

摘要

A compact dual-band rectangular ring printed antenna for wireless local area network (WLAN) applications is proposed and investigated in this paper. The dual-band is realized by using a rectangular ring patch connected with a 50Ω mini-coaxial feed structure composed of a longitudinal slot and a small rectangular, occupying a small board space of 30.6mm*6mm on the system circuit board. With a modified rectangular ground plane on the back of the main structure, a better impedance matching is obtained. The antenna provides two wide operation bands covering the WLAN frequency bands: 2.4GHz(2.4-2.483GHz),5.2GHz(5.15-5.35GHz)and 5.8GHz(5.725-5.875GHz) applying to IEEE 802.11a and IEEE 802.11b. This antenna is simulated and studied by the High-Frequency Structure Simulator (HFSS) and the operating procedure of the proposed antenna is described in detail, as well. The result of simulation reveals that the resonant bands are 2.216GHz to 2.612GHz and 5.108GHz to 5.875GHz with the relative bandwidth of 16.2% and 13.2% respectively. Besides, the fabricated antenna is tested by the vector network analyzer, and the results are in accordance with the simulated on the whole.