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, 1999
Filed:
Jul. 23, 1998
Toru Nozaki, Matsusaka, JP;
Hiroyuki Fujii, Matsusaka, JP;
Central Glass Company, Limited, Yamaguchi, JP;
Abstract
An antenna system for a vehicle is provided. The antenna comprises an antenna disposed on a window glass and having a feed point, a matching circuit connected to the feed point, and a coaxial cable connecting between the matching circuit and the radio receiver. The matching circuit includes a parallel circuit having a damping resistor, a first coil and a first capacitor. The matching circuit further includes a second coil and a second capacitor connected in series between an output side of the parallel circuit and a ground such that, assuming that MF1 is a lower limited frequency of medium-frequency (MF) broadcast waves and MF2 is an upper limited frequency of the MF broadcast waves, a receiving sensitivity of the antenna system has local maximum points which are present at a frequency F1 in the range from (MF1-170) to MF1 KHz and at a frequency f2 in the range from (MF2-230) to MF2 KHz, respectively, and a local minimum point which is present at a frequency f0 smaller than f1 and equal to or larger than 50 KHz.