Mechanically pattern reconfigurable dual-band antenna with omnidirectional/directional pattern for 2.4/5GHz WLAN application

A mechanically pattern reconfigurable dual-band antenna with an omnidirectional radiation pattern or a directional pattern for 2.4/5GHz dual-band WLAN application is presented. By manually rotating the top substrate, the antenna can operate at patch state or monopole state, respectively. A novel U-gap structure consisting of an outer patch, an inner patch and a U-shaped gap is introduced to achieve the dual band feature at both operation states. The measured overlapped bands of the two states are 2.4-2.56 GHz and 5.22-6 GHz, covering the 2.4-2.48 GHz and most of the 5.15-5.85 GHz WLAN band. The measured peak gain is 2.4 dBi at 2.5GHz, 6.2 dBi at 5.5 GHz for monopole state, and 5.8 dBi at 2.5 GHz, 7.2 dBi at 5.5 GHz for patch state.