a reconfigurable dual-band antenna with omnidirectional radiation mode and directional mechanical mode is proposed.By manually rotating the top substrate
the antenna can work in patch state or monopole state respectively.A new U-type gap structure consisting of outer patch
inner patch and U-type gap is introduced.The dual-frequency characteristics under two working conditions are realized.The measurement overlap bands of these two states are 2.4 ~ 2.56 GHz and 5.66 ~ 6.36 GHz
respectively
and 2.32~ 2.45 GHz and most of the 5.71~ 6.33 GHz WLAN bands.The measured peak gain is 7.0 dBi at 2.5 GHz