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:
Apr. 11, 1995
Filed:
May. 05, 1993
Yoshimi Egashira, Sagamihara, JP;
Katsuhiko Yamakawa, Tokyo, JP;
Harada Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A three-wave antenna for vehicles which includes a monopole antenna element which has an electrical length of approximately 1/4 of the wavelength in the FM broadcast band along with a double sleeve used to prevent current flow and with a second double sleeve used for phase adjustment that are installed coaxially with the antenna element. The positional relationships between the inner and outer cylinders of each one of the first and second double sleeves relative to the antenna element are respectively specified. In addition, an antenna attachment which has a capacitive reactance and is installed at the base of the antenna element so that it cancels the inductive reactance of the antenna and causes the impedance of the antenna to approach a prescribed value is employed together with a wave splitter which includes a high pass filter that has a double tuning function with respect to the inductive reactance and the capacitive reactance and a low pass filter that separates the AM/FM broadcast band signals from the telephone band.