Patent ID: 6147652
Filing Date: 2000-11-14
Classification: H01Q

Abstract:
An antenna apparatus comprising:a rectangular-shaped conductor plate formed of electrically conductive material and having two sides in a longitudinal direction with a length of one fourth the wavelength corresponding to a certain operating frequency;a short-circuited point disposed in the vicinity of one side of two sides substantially perpendicular to the two sides in the longitudinal direction of said rectangular-shaped conductor plate;a first line-shaped element connected at one end to said rectangular-shaped conductor plate at said short-circuited point;a power-feed point disposed in the vicinity of said one side of the two sides substantially perpendicular to the two sides in the longitudinal direction of said rectangular-shaped conductor plate;a second line-shaped element connected at one end to said rectangular-shaped conductor plate at said power-feed point; anda third line-shaped element connected at one end to said first line-shaped element, connected to said second line-shaped element such that the length from said power-feed point to another end of the third line-shaped element is equal to one fourth the wavelength, and is disposed substantially perpendicularly to the two sides in the longitudinal direction of said rectangular-shaped conductor plate,wherein said power-feed point and said short-circuited point are disposed in the vicinity of a corner of said rectangular-shaped conductor plate, andwherein said third line-shaped element is disposed substantially at a right angle at a first disposed section near the other end and disposed substantially at a right angle at a second disposed section closer to the other end than the first disposed section.