The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 18, 2006
Filed:
Jan. 30, 2004
Toshio Obara, Kanagawa, JP;
Takashi Miura, Kanagawa, JP;
Hidenori Matsumoto, Kanagawa, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
It is an object of the present invention to switch bands with a simple structure in which frequency bands can be individually switched respectively in a transmission and a reception and only a receiving part can be switched to another frequency band without disconnecting an upward line during communication. The device of the invention includes an antenna () capable of transmitting and receiving radio waves of first and second frequency bands, a wave separator (), antenna sharing devices (A,B) respectively provided so as to correspond to the frequency bands, transmitting circuits (A,B), transmitting PLL synthesizers (A,B), receiving circuits (A,B) and receiving PLL synthesizers (A,B). A control partcontrols, through a common three-line serial bus, the transmitting PLL synthesizers (A,B), the receiving PLL synthesizers (A,B), a transmitting band switching signal generating circuit () and a receiving band switching signal generating circuit () to individually switch the frequency bands respectively in the transmission and the reception.