ANTENNA WITH VARIABLE MULTIFREQUENCY COMMON RADIATION BEAM HALF BANDWIDTH

摘要

PROBLEM TO BE SOLVED: To provide an antenna with a multifrequency common radiation beam half bandwidth which varies and adjusts the radiation beam half bandwidth of in-horizontal-plane directivity of the highest frequency without the need to replace an existent antenna.

SOLUTION: The antenna with the multifrequency common radiation beam half bandwidth for vertical polarization which resonates in a two-frequency band or three-frequency band has the in-plane radiation beam half bandwidth of the highest frequency made narrow by standing a 1st metal conductor 1 and a 2nd metal conductor 2 having heights nearly a half as large as the wavelength at the highest frequency nearby an antenna element 3' in directions of ±90° to its main radiation direction.

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