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:
Oct. 10, 1995
Filed:
Jul. 30, 1993
Xu Hai, Kanagawa, JP;
Yoshimi Egashira, Kanagawa, JP;
Harada Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An M-type car antenna for traffic information communication systems including an antenna element having a length which is one-half of the wavelength of the radio way used in the information communication systems, and a connector which is connected via an electrostatic coupling to the center-of the antenna element, the impedance matching and feeding being carried out by the connector. In this antenna, the voltage polarity of the connector at the coupling point and that of the center of the antenna element are set to be opposite from each other, and the electric current in the antenna element and that in the connector are set to be in the same direction. Thus, the M-type antenna is compact and easy to manufacture with stable antenna characteristics.