Abstract: An antenna device for a vehicle, comprising: an antenna base that is attached to a predetermined site of a vehicle; an antenna case forming an accommodation space with the antenna base; a first antenna portion accommodated in the accommodation space and corresponding a first frequency band; and a second antenna portion accommodated in the accommodation space and corresponding a second frequency band lower than the first frequency band, wherein at least a portion of a region of the first antenna portion and at least a portion of a region of the second antenna portion overlap each other, wherein a limiting circuit is connected to a power feeding portion of at least one antenna portion of the first antenna portion and the second antenna portion, and wherein the limiting circuit limits transmission of signals with frequencies outside a frequency band corresponded by the antenna portion.

Abstract: There is provided an antenna device for a vehicle capable of suppressing interference in a case where a plurality of antennas which receive signals in different frequency bands are close to one another. The antenna device for the vehicle includes a patch antenna and a capacitance loading element which are installed away from each other on an antenna base section which is attachable to a vehicle. The capacitance loading element is a part of an antenna capable of receiving a different use frequency band from which of the patch antenna, to form a three-dimensional shape in which a pair of linear conductors which respectively repeatedly turn in a predetermined direction are connected to each other via a linear connection conductor extending in a width direction of the antenna base section, and in the capacitance loading element, a length of a folded portion of each of the linear conductors is a non-resonant length of the patch antenna.

Abstract: There is provided an antenna device for a vehicle capable of suppressing interference in a case where a plurality of antennas which receive signals in different frequency bands are close to one another. The antenna device for the vehicle includes a patch antenna and a capacitance loading element which are installed away from each other on an antenna base section which is attachable to a vehicle. The capacitance loading element is a part of an antenna capable of receiving a different use frequency band from which of the patch antenna, to form a three-dimensional shape in which a pair of linear conductors which respectively repeatedly turn in a predetermined direction are connected to each other via a linear connection conductor extending in a width direction of the antenna base section, and in the capacitance loading element, a length of a folded portion of each of the linear conductors is a non-resonant length of the patch antenna.