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. 16, 1997
Filed:
Jun. 03, 1996
Applicant:
Inventors:
Kanta Urakami, Himeji, JP;
Nobuya Niizaki, Yokohama, JP;
Hirofumi Natsume, Chiba, JP;
Masato Arisawa, Tsuchiura, JP;
Harunori Murakami, Osaka, JP;
Yuji Baba, Osaka, JP;
Assignees:
Sumitomo Chemical Company, Limited, Osaka, JP;
Nippon Sheet Glass Co., Ltd., Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01Q / ; H01Q / ;
U.S. Cl.
CPC ...
343713 ; 343850 ; 343860 ; 333 32 ;
Abstract
A glass antenna system for an automobile comprises a T-shaped or pi-shaped dynamic impedance matching circuit. Another system comprises an integrated circuit consisting of T-shaped FM and AM matching circuits each connected to a common cable. The T-shaped or pi-shaped matching circuit comprises at least two varactor diodes each applied to a channel selection voltage to match the FM antenna impedance with that of the FM receiver including that of the transmission cable.