Patent ID: 7031744
Filing Date: 2006-04-18
Classification: H01Q,H04B

Abstract:
1. A cellular phone including first and second housings, forming a pair of housings, folded upon each other when the cellular phone is closed, said cellular phone comprising: two planar antennas disposed within said pair of housings, respectively, so that a surface having the greatest directivity of each of said two planar antennas is directed outward when said cellular phone is closed, wherein when said cellular phone is used while being closed in a waiting state, both of said two planar antennas or either one of said two planar antennas is used to send or receive, and when said compact cellular phone is used while being open in a communication state, one of said two planar antennas, which has the better transmission state, is selected to send and receive, and wherein by detecting and evaluating an impedance change and a physical quantity of a reflective wave caused by said impedance change on an electric-power transmission path provided inside said cellular phone, one of said two planar antennas, which has preferred transmission characteristics, is determined, selected, and used.