Multiband antenna and mounting structure for multiband antenna

摘要

An antenna that resonates at each of at least operating two frequency bands includes a first LC parallel circuit having a first impedance between a feeding element and a feeding circuit, and a second LC parallel circuit having a second impedance between a parasitic element and ground. The feeding element and the parasitic element are configured such that multiple resonant frequencies are positioned between the two operating frequency bands in a case where the impedances of the first and second LC parallel circuits are set to 0, and the LC parallel circuits having the first and second impedances cause the multiple resonance frequencies to shift to an operating frequency band on the lower frequency side and to the higher frequency side, of the two operating frequency bands.

主权项

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.