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:
Dec. 07, 2010
Filed:
Nov. 07, 2005
Applicant:
Kazuhisa Ishiguro, Gunma, JP;
Inventor:
Kazuhisa Ishiguro, Gunma, JP;
Assignee:
Ricoh Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B 1/18 (2006.01);
U.S. Cl.
CPC ...
Abstract
An antenna damping circuit in which the frequency characteristics of damping amount can be made substantially flat by providing a resistor (Ra) between PIN diodes (D, D) having a resistance varying upon application of a control voltage (Vc) and a capacitive dummy antenna circuit (), and setting its resistance high enough to neglect the capacity of the dummy antenna circuit () sufficiently when the dummy antenna circuit () is viewed from the side of the PIN diodes (D, D) thereby substantially eliminating the influence of capacity of the dummy antenna circuit ().