Patent ID: 6057801
Filing Date: 2000-05-02
Classification: H01Q

Abstract:
A multiple frequency array antenna which comprises:two printed antennas which are separated by a distance; and a double U-shaped printed antenna which is connected with a line fed by a port and surrounds said two printed antennas,wherein:said two printed antennas and said double U-shaped printed antenna are formed on a substrate;a projecting length (including zero) of said two printed antennas from said double U-longitudinal antenna, a longitudinal distance, and a transversal distance between said two printed antennas and said double U-shaped printed antenna are respectively adjusted to obtain the optimum matching for two different resonance frequencies F1 and F2 (F1<F2);said distance and said projecting length are adjusted to obtain a resonance peak at said resonance frequency F2;said resonance frequencies F1 and F2 are determined by a length of a resonance edge portion of said double U-shaped printed antenna and by a length of the resonance edge portion of said two printed antennas; anda width of said two printed antennas and a width of said double U-shaped printed antenna are adjusted to control the matching for the resonance frequencies F1 and F2.