Patent ID: 8947315
Filing Date: 2015-02-03
Classification: H01Q

Abstract:
1. A multiband antenna that resonates at each of at least two operating frequency bands on a lower frequency side and on a higher frequency side, the multiband antenna comprising: a feeding element including a feeding radiation electrode and a parasitic element including a parasitic radiation electrode formed on a dielectric base; a first LC parallel circuit having a first impedance between the feeding radiation electrode and a feeding circuit; and a second LC parallel circuit having a second impedance between the parasitic radiation electrode and a ground, wherein of the feeding element and the parasitic element are configured such that multiple resonance frequencies are positioned between the two operating frequency bands in a case where impedances of the first and second LC parallel circuits are set to 0, and inductors of the LC parallel circuits having said first and second impedances result in multiple resonance frequencies in an operating frequency band on the lower frequency side of the two operating frequency bands, and capacitors of the LC parallel circuits having said first and second impedances result in multiple resonance frequencies in an operating frequency band on the higher frequency side of the two operating frequency bands.