Compact cellular phone

• US 20020068602A1
• Filed: 12/03/2001
• Published: 06/06/2002
• Est. Priority Date: 12/01/2000
• Status: Active Grant

• Current Assignee: Coltera LLC
• Original Assignee: NEC Corporation
• Inventors: Hankui, Eiji, Kuriyama, Toshihide
• Granted Patent: US 7,031,744 B2
• Time in Patent Office: Days
• US Class Current: 455/575.7
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/245 with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H04B 7/0608 Antenna selection according to transmission parameters
• CPC Class Codes: H04B 7/0805 with single receiver and antenna switching H04B7/0822 takes precedence

Abstract

A compact cellular phone with a foldable configuration and two planar antennas having outward directivities are provided inside the compact cellular phone in the foldable configuration. An interval between the two planar antennas provided to a pair of housings is equal to or wider than a width of a human palm in a state in which the compact cellular phone is open. The two planar antennas are planar inverse F-type antennas or patch antennas and impedance around each of the two planar antennas is measured. Then, one of the two planar antennas, which has a preferred transmission characteristic, is selected and used.

Claims

1. A compact cellular phone in which a pair of housings formed in an approximate flat shape is foldably connected by using a hinge, said compact cellular phone comprising:

two planar antennas provided to said pair of housings, respectively, so that a highly sensitive surface of each of said two planar antennas is directed outward in a state in which said compact cellular phone is closed.

2. The compact cellular phone according to claim 1, wherein an interval between said two planar antennas provided to said pair of housings is equal to or wider than a width of a human palm in a state in which said compact cellular phone is open.

3. The compact cellular phone according to claim 1, wherein said two planar antennas are provided outermost inside said pair of housings, respectively, in a state in which said compact cellular phone is closed.

4. The compact cellular phone according to claim 1, wherein said two planar antennas are two planar inverse F-type antennas or two patch antennas.

5. The compact cellular phone according to claim 1, wherein when said compact 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.

6. The compact cellular phone according to claim 5, 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 compact cellular phone, one of said two planar antennas, which has preferred transmission characteristics, is determined, selected, and then used.

7. The compact cellular phone according to claim 2, wherein said two planar antennas are provided outermost inside said pair of housings, respectively, in a state in which said compact cellular phone is closed.

8. The compact cellular phone according to claim 2, wherein said two planar antennas are two planar inverse F-type antennas or two patch antennas.

9. The compact cellular phone according to claim 2, wherein when said compact 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.

10. The compact cellular phone according to claim 9, 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 compact cellular phone, one of said two planar antennas, which has preferred transmission characteristics, is determined, selected, and then used.