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:
Aug. 24, 1993
Filed:
May. 21, 1990
Yoshimi Egashira, Sagamihara, JP;
Harada Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A three-wave vehicle antenna in which an insulating pipe is connected to the tip of a conducting pipe, and an MT wave antenna element and a coaxial MT wave matching device are housed in the insulating pipe. One end of the coaxial MT wave feeder cable is connected to the matching device and the other end is guided through the conductive pipe which is designed to be used as an AM/FM antenna. The coaxial MT wave feeder cable uses polytetrafluoroethylene, at least for the external insulation member, for covering the outer conductor. With this arrangement it is possible for the three-wave vehicle antenna to check decreases in sensitivity of the AM/FM wave antenna element, since it is feasible to lower the stray capacity between the conductive pipe and the outer conductor of the coaxial MT wave feeder cable without enlarging the diameter of the conductor pipe.