Patent ID: 6369760
Filing Date: 2002-04-09
Classification: H01Q

Abstract:
A compact planar microstrip antenna, comprising:a dielectric substrate being disposed on a conductive ground plane, said dielectric substrate having a top planar surface; said antenna having a given length; a first conductive patch placed on said top planar surface, said first conductive patch having a width, W1; said first conductive patch, having a shorted end shorted to said ground plane, being connected to a coaxial probe; a second conductive patch placed on a second portion of said top planar surface being adjacent to said first conductive patch; said second conductive patch, having a central region with a given impedance, an outer patch region and a width, W2, greater than said width, W1, being connected to said first conductive patch in proximity to said central region at a junction point opposing said shorted end of the first conductive patch; said dielectric substrate having an effective impedance value; said first conductive patch causing a reduced effective impedance at said junction point, said reduced effective impedance being lesser than said effective impedance; and said reduced effective impedance providing an antenna length, AL, shorter than said given length.