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Antenna

  • US 20060017621A1
  • Filed: 07/15/2005
  • Published: 01/26/2006
  • Est. Priority Date: 01/15/2003
  • Status: Abandoned Application
First Claim
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1. An antenna for transmission and/or receipt having a single feeder comprising:

  • an active antenna element in which an antenna current excited by feeding is distributed in a line to radiate electromagnetic waves, said active antenna element having a conductor pattern formed two-dimensionally on surfaces of a dielectric substrate made of a dielectric of a high dielectric constant and low loss and surface-mounted as a chip component on a print circuit board, said antenna element being configured such that a plurality of distribution paths for the antenna current are formed to be different in length to each other, wherein said antenna element constitutes a grounded-type antenna in which said antenna current is copied in a around conductor, and comprises a linear main radiation conductor, of which one end is a feeding end and an other end on the opposite side is an open end, and a linear short-circuiting conductor branching off at a position along said main radiation conductor in the shape of T and leadina to said ground conductor;

    wherein the distribution path for said antenna current is formed to be among at least two of a first path from the one end to the other end of said main radiation conductor, a second path from the one end of said main radiation conductor through said T-shaped branch to said ground conductor, and a third path leading to and turning back at the other end of said main radiation conductor and leading to said ground conductor, and thereby said antenna has at least two resonance frequency bands other than those of harmonics; and

    wherein said antenna element is in the form of a surface-ounted chip component formed with said dielectric substrate, and said main radiation conductor and a feeding conductor at one end thereof together are formed by conductor patterns formed on said dielectric substrate, and said short-circuiting conductor is formed by a conductor pattern formed over an upper surface and side surface of said dielectric substrate.

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