| US 7,577,452 B2 | ||
| Mobile telephone apparatus | ||
| Yasuhisa Kimura, Yokohama (Japan); and Koji Noda, Yokohama (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 10/497,402 PCT Filed Dec. 12, 2002, PCT No. PCT/JP02/13025 § 371(c)(1), (2), (4) Date Jun. 02, 2004, PCT Pub. No. WO03/052971, PCT Pub. Date Jun. 26, 2003. |
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| Claims priority of application No. 2001-381665 (JP), filed on Dec. 14, 2001. | ||
| Prior Publication US 2005/0014520 A1, Jan. 20, 2005 | ||
| Int. Cl. H04B 15/00 (2006.01); H04B 7/005 (2006.01); H04B 7/01 (2006.01); H04B 7/015 (2006.01) | ||
| U.S. Cl. 455—502 [455/279.1; 455/575.7; 370/350] | 3 Claims |
| 1. A cell phone comprising:
a first antenna that receives radio waves from a base station;
a second antenna that receives radio waves from the base station;
a receiving circuit that acquires receiving levels of channels via the antennas;
a switch circuit that switches the antennas; and
a controller for selecting the channel that has the highest receiving level and that controls switching the antennas before
selecting one of the antennas, wherein, when synchronization with the base station is not provided, the controller alternately
switches the antennas a predetermined number of times during a predetermined fixed time that is calculated by the controller
based on a total number of perch channels and a perch channel detection time, such that the switching is not in synchronization
with any channel received from the base station, and
wherein the controller alternately switches between the antennas with a predetermined timing in synchronization with the selected
channel when synchronization with the base station is provided.
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