Patent ID: 6124829
Filing Date: 2000-09-26
Classification: H01Q

Abstract:
An antenna, comprising:a dielectric substrate having first and second surfaces;an annular patch formed on the first surface of said dielectric substrate, the annular patch having a center point with an inner periphery and an outer periphery surrounding the center point;a feeder portion for feeding a signal to a first position of said annular patch;a first shortcircuit portion connected between a second position and said ground conductor, the second position being located on the inner periphery of said annular patch between the center point of said annular patch and the first position; anda second shortcircuit portion connected between a third position on the inner periphery of said annular patch and said ground conductor,wherein the first and second shortcircuit portions are separated by two areas, one to each side of the first shortcircuit portion, wherein each of said two areas has no shortcircuit portions along said inner periphery, and wherein a resonance frequency of said antenna is selected by electrical widths of said first and second shortcircuit portions along said inner periphery.