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. 20, 2004
Filed:
Dec. 22, 1999
Applicant:
Inventors:
Mitsutaka Hikita, Kokubunji, JP;
Kazuyuki Sakiyama, Mizusawa, JP;
Naoki Matsuura, Mizusawa, JP;
Nobuhiko Shibagaki, Kokubunji, JP;
Assignee:
Hitachi Media Electronics Co., Ltd., Iwate-ken, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01Q 1/24 ; H04Q 7/32 ;
U.S. Cl.
CPC ...
H01Q 1/24 ; H04Q 7/32 ;
Abstract
An antenna duplexer is reduced in size, so that a dual-band/triple-band mobile radio terminal small in size and light in weight is realized. An off-set PLL modulation system is adopted, and a transmitting system of the antenna duplexer is constituted by switches. Further, in mounting an SAW filter, a multi-layer substrate is adopted, matching circuits and so on are formed by lumped-constant circuit elements, and the SAW filter is received in a space provided on the multi-layer substrate.