SURFACE-MOUNT ANTENNA AND COMMUNICATION DEVICE WITH SURFACE-MOUNT ANTENNA

摘要

Power non-supplied side radiation electrode 3 and power supplied side radiation electrode 4 are formed on the surface of a dielectric substrate 2 with a space therebetween. A permittivity adjusting material portion 8 is provided in the space S which is situated between the power non-supplied side radiation electrode 3 and the power supplied side radiation electrode 4, and in which a capacity occurs. The permittivity adjusting material portion 8 has a lower permittivity than that of the dielectric substrate 2, which causes the permittivity between the power non-supplied side radiation electrode 3 and the power supplied side radiation electrode 4 to be lower than that of dielectric substrate 2, and weaken the capacitive coupling between the power non-supplied side radiation electrode 3 and the power supplied side radiation electrode 4. As a result, it becomes possible to suppress the mutual interference of the resonances of the power non-supplied side radiation electrode 3 and the power supplied side radiation electrode 4, and to thereby improve antenna characteristics, without taking measures such as widening of the space S between the power non-supplied side radiation electrode 3 and the power supplied side radiation electrode 4, or a reduction of the permittivity of the dielectric substrate 2, the measures - 42 - hindering the surface-mounted type antenna 1 from miniaturization.