Patent ID: 7969381

Claim:
A wireless device comprising: a patch antenna; a first housing and a second housing, both of which are provided to be openable and closable, and the patch antenna being provided in the first or second housing; and an open/shut sensing unit which senses an open/shut state of the first housing with respect to the second housing and forms an open/shut signal indicating the open/shut state, wherein the patch antenna comprises: a first element which corresponds to a first polarized wave; a second element which corresponds to a second polarized wave and is to be added to the first element; and a switching unit which disconnects the second element from the first element or connects the second element to the first element to make the patch antenna suitable for the first or second polarized wave, wherein the switching unit switches the disconnection of the second element from the first element and the connection of the second element to the first element based on the open/shut signal; wherein the switching unit comprises switching elements which connect the first element and the second element; wherein each of the switching elements comprises a diode having a cathode connected to the first element and an anode connected to the second element, and wherein the second element is connected to a ground potential through a choke coil, wherein when the wireless device is in an open state, the diodes are turned off according to the open/shut signal to disconnect the second element from the first element, thereby the patch antenna becomes in a state suitable for the first polarized wave, and, when the wireless device is in a shut state, the diodes are turned on according to the open/shut signal to connect the second element to the first element, thereby the patch antenna becomes in a state suitable for the second polarized wave, said wireless device further comprising: an attitude sensing unit which senses a tilt of the housing and forms an attitude signal indicating the tilt; and a control unit which forms a control signal for the switching unit based on the open/shut signal and the attitude signal, wherein the switching unit switches the disconnection of the second element from the first element and the connection of the second element to the first element based on the control signal.