Patent ID: 6307508
Filing Date: 2001-10-23
Classification: H01Q

Abstract:
A flat antenna comprising:a patch antenna section which is set to resonate at a predetermined frequency;a dielectric plate having one surface in contact with said patch antenna section and another surface in contact with a grounded plate; anda coaxial feeder connected to said patch antenna section through both said grounded plate and said dielectric plate said coaxial feeder having a center conductive portion which penetrates said dielectric plate and is connected to a feeder point of said patch antenna section;wherein said feeder point is located on said patch antenna section at a position deviated from a theoretical point of resonance of said patch antenna section such that the resonance frequency of said patch antenna section is set to a value higher than receive frequencies so that an inductive impedance component of said center conductive portion is substantially equal to a capacitive impedance component of the feeder point of said patch antenna portion over use frequencies.