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:
Mar. 21, 2006
Filed:
Jul. 30, 2004
Ken Takei, Kawasaki, JP;
Hiroyuki Aoyama, Kumagaya, JP;
Ken Takei, Kawasaki, JP;
Hiroyuki Aoyama, Kumagaya, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
The invention provides a small multimode antenna capable of commonly using a single feeding point at a plurality of frequencies. The antenna includes a radiating conductordisposed above a ground conductorand distributed-constant circuitsandcoupled to the radiating conductor. Each of the distributed-constant circuits is constructed by a transmission line and has a branch. One end of the radiating conductor and one end of the distributed-constant circuitare connected to each other to be a connection point and, further, the other end of the radiating conductor and one end of the distributed-constant circuitare connected to each other. The connection point is a single feeding pointusing the ground conductor as an earth. The distributed-constant circuitsandare designed as an equivalent circuit in which different stubs are connected in parallel with a transmission line, and impedance matching at a plurality of frequencies is realized at the feeding point.