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:
Apr. 25, 2006
Filed:
Apr. 22, 2004
Hiroyuki Nakamura, Osaka, JP;
Shun-ichi Seki, Hyogo, JP;
Hiroyuki Nakamura, Osaka, JP;
Shun-Ichi Seki, Hyogo, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An antenna duplexer including: a transmission filter, a reception filter, phase-shift circuits of adjusting phase characteristics on a transmission side and a reception side; and a junction point of connecting an antenna, wherein (1) an absolute value θof a difference between a first phase at a predetermined frequency of a pass band of the first filter and a second phase at the predetermined frequency at the time when the reception filter side is viewed from the junction point and (2) an absolute value θof a difference between a third phase at a predetermined frequency of a pass band of the reception filter and a fourth phase at the predetermined frequency at the time when the transmission filter side is viewed from the junction point is included in a range of 100 degrees or more and 170 degrees or less.