Cellular phone and method of operating the same
AssigneeNEC Corporation
InventorHideki Ueda
Life of this patent
Estimating the term…
Abstract
A cellular phone covering a plurality of frequency bands, includes (a) an antenna, (b) a high-frequency circuit, (c) an antenna-matching circuit electrically connecting in series between the antenna and the high-frequency circuit, and (d) a first unit which varies a ground length in accordance with a frequency band in which the cellular phone makes communication with others, the ground length being defined as a length of a ground area for the antenna-matching circuit.
Claims28
A cellular phone covering a plurality of frequency bands, comprising:
- (a) an antenna;
- (b) a high-frequency circuit;
- (c) an antenna-matching circuit electrically connecting in series between said antenna and said high-frequency circuit;
- and
- (d) a first unit which varies a ground length in accordance with a frequency band in which said cellular phone makes communication with others, said ground length being defined as a length of a ground area for said antenna-matching circuit.
A method of operating a cellular phone covering a plurality of frequency bands, including the steps of:
- (a) detecting a frequency band in which said cellular phone makes communication with others;
- and
- (b) varying a ground length in accordance with said frequency band detected in said step (a), said ground length being defined as a length of a ground area for an antenna-matching circuit of said cellular phone.
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.
A program for causing a computer to carry out a method of operating a cellular phone covering a plurality of frequency bands, processing executed by said computer in accordance with said program including:
- (a) detecting a frequency band in which said cellular phone makes communication with others;
- and
- (b) varying a ground length in accordance with said frequency band detected in said processing (a), said ground length being defined as a length of a ground area for an antenna-matching circuit of said cellular phone.
A program for causing a computer to carry out 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,
- processing executed by said computer in accordance with said program including:
- (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.
Dependencies are inferred from the claim text.