Antenna device
AssigneeYokowo Co., Ltd.
InventorsNoritaka Terashita, Motohisa Ono
Life of this patent
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Abstract
An antenna device which includes a plurality of antennas in a common case and is capable of achieving downsizing while suppressing a decrease of an antenna gain, is provided. An antenna device includes a TEL antenna and a capacity loaded element in a common case. The capacity loaded element is located above the TEL antenna. A length of the capacity loaded element is a positive integer multiple of one-half a wavelength of a PCS band. The TEL antenna is arranged so as to avoid a voltage maximum point of a standing wave, of the PCS band, generated in the capacity loaded element.
Claims12
An antenna device for a vehicle comprising:
- a common case;
- and
- a first antenna and a second antenna which are provided in the common case,
- wherein the second antenna has a plate shape and is located above the first antenna,
- wherein a whole length of the second antenna is an odd multiple of one-half of a wavelength of a frequency band of the first antenna,
- wherein a center position of the first antenna in a front-rear direction of the first antenna is located within one-eighth of a wavelength from a voltage minimum point of a standing wave that is generated in the second antenna between ends of the whole length of the second antenna by the frequency band of the first antenna,
- wherein at least a part of the first antenna overlaps at least a part of the second antenna when viewed from a right-left direction of the antenna device, and
- wherein the frequency band of the first antenna is higher than a frequency band of the second antenna.
Dependencies are inferred from the claim text.