Surface-mounted type antenna, method for adjusting and setting dual-resonance frequency thereof, and communication device including the surface-mounted type antenna

摘要

A surface-mounted type antenna (1) which facilitates the realization of the widening of the frequency band, and a communication device including it. In this antenna (1), the strong electric-field regions (Z1,Z2) of a power supplied first radiation electrode (3) and a power non-supplied second radiation electrode (4) are disposed adjacent to each other with a spacing (H1) therebetween, and simultaneously the high current regions (X1,X2) of these radiation electrodes (3,4) are disposed adjacent to each other with a spacing (H2) therebetween. By variably adjusting the quantity of the electric-field coupling between the strong electric-field regions (Z1,Z2) of the first radiation electrode (3) and the second radiation electrode (4), and by variably adjusting the quantity of the magnetic-field coupling between the high current regions (X1,X2) of these radiation electrodes (3,4), both the quantities of the electric-field coupling and the magnetic-field coupling are set to conditions suited for the dual resonance. A superior dual resonance is thereby achieved.