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:
May. 18, 2004
Filed:
Jan. 03, 2002
Seiji Fuyama, Kanagawa, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention intends to provide an electronic toll collection system for suppressing multi-path. For this end, the electronic toll collection system automatically collects tolls by establishing wireless communication between a roadside antenna of a toll gate and a vehicle unit installed in a traveling vehicle. It features a road-to-vehicle wireless communication zone of the tollgate covered with a structure including radio wave absorbing material. The inner surface is preferably made from a radio wave absorbing member including a mixture of magnetic material and synthetic rubber. The roadside antenna is installed inside the structure , thereby enabling the roadside antenna to wireless communicate only with ETC vehicles traveling in the structure and preventing multi-path between the roadside antenna and vehicles traveling outside the structure (or outside the communication zone).