US 7,348,926 B2
	Cellular phone and method of operating the same
Hideki Ueda, Tokyo (Japan)
Assigned to NEC Corporation, Tokyo (Japan)
Filed on Jul. 20, 2005, as Appl. No. 11/184,949.
Application 11/184949 is a division of application No. 10/436154, filed on May 13, 2003.
Claims priority of application No. 2002-139141 (JP), filed on May 14, 2002.
Prior Publication US 2005/0255875 A1, Nov. 17, 2005
Int. Cl. H01Q 1/48 (2006.01); H01M 1/00 (2006.01)

U.S. Cl. 343—702  [343/846; 343/861; 455/575.7]

3 Claims

1. A method of operating a cellular phone covering a plurality of frequency bands, said cellular phone being comprised of a first body, and a second body mechanically connected to said first body through a hinge such that said second body is rotatable at an end thereof relative to said first body, said method including the steps of: (a) detecting whether said first and second bodies are open or closed to each other; and (b) varying a ground length in accordance with the result of said step (a), said ground length being defined as a length of a ground area for an antenna-matching circuit of said cellular phone, wherein said cellular phone includes a first printed substrate arranged in said first body, a first switch formed on said first printed substrate, a second printed substrate arranged in said second body, and a second switch formed on said second printed substrate, said method further comprising the step of grounding said first and second switches when said cellular phone makes communication in a first frequency band, and causing said first and second switches to make an impedance circuit when said cellular phone makes communication in a second frequency band greater than said first frequency band.