SMALL MULTIMODE ANTENNA AND HIGH FREQUENCY MODULE USING IT

摘要

A small multimode antenna for use in a small and inexpensive multimedia radio terminal in which one feeding point can be shared by a plurality of frequencies, and a high frequency module employing that antenna arranged such that one end of the radiation conductor (1) of the antenna serves as a single feeding point (4) common to the plurality of frequencies, with a first one port resonance circuit (2) being connected with one end of the radiation conductor (1) having the other end connected with a second one port resonance circuit (3). The conductance component of an admittance when the free space is viewed from the feeding point (4) is equalized to the characteristic admittance (5) of a high frequency circuit, and the susceptance component of the admittance is offset by the plurality of frequencies by means of the resonance circuit (2) connected with the feeding point (4).