Antenna device
AssigneeYokowo Co., Ltd.
InventorsNoritaka Terashita, Motohisa Ono, Yuki Kato
Life of this patent
Estimating the term…
Abstract
An antenna device to be mounted to a vehicle roof, includes: a case unit having an accommodating space formed therein and having a radio wave permeability; and an antenna unit to be accommodated in the accommodating space, wherein the antenna unit has: a pair of capacitance loading elements facing across a plane, as a center, perpendicular to the vehicle roof at a predetermined interval and at a predetermined angle to each other; a coupling portion provided at a portion lower than an upper edge of the pair of the capacitance loading elements to conduct each of the pair of capacitance loading elements each other via each of the coupling portions; and a helical element electrically connected to the coupling portions.
Claims20
An antenna device to be attached to a vehicle, comprising:
- a base;
- a case that forms an accommodating space together with the base;
- and
- an antenna disposed in the accommodating space, wherein
- the base includes a conductive base and an insulating base,
- a ground plate is disposed in the base,
- the conductive base and the ground plate are separated from each other, and
- the conductive base and the ground plate are located on the same side with respect to the insulating base.
An antenna device to be attached to a vehicle, comprising:
- a base;
- a case that forms an accommodating space together with the base;
- and
- an antenna disposed in the accommodating space, wherein
- the base includes a conductive base,
- a ground plate is disposed in the base,
- the conductive base and the ground plate are separated from each other,
- the antenna includes a first antenna arranged above the conductive base and a second antenna arranged above the ground plate, and
- the ground plate is larger than a size of the second antenna and is configured to improve a gain of the second antenna.
An antenna device to be attached to a vehicle, comprising:
- a base;
- a case that forms an accommodating space together with the base;
- and
- an antenna disposed in the accommodating space, wherein
- the base includes a conductive base,
- a ground plate is disposed in the base,
- the conductive base and the ground plate are separated from each other,
- the antenna includes a first antenna arranged above the conductive base and a second antenna arranged above the ground plate,
- the second antenna has a shield cover, and
- the ground plate and the shield cover are integrated with each other.
An antenna device to be attached to a vehicle, comprising:
- a base;
- a case that forms an accommodating space together with the base;
- and
- an antenna disposed in the accommodating space, wherein
- the base includes a conductive base,
- a ground plate is disposed in the base,
- the conductive base and the ground plate are separated from each other,
- the antenna includes a first antenna arranged above the conductive base and a second antenna arranged above the ground plate,
- the second antenna is a planar antenna that supports reception of circularly polarized waves,
- the antenna device further comprises a parasitic element disposed a predetermined distance above the planar antenna, and
- the parasitic element is arranged, with respect to the planar antenna, at a position that is shifted toward a side where the first antenna is arranged.
An antenna device to be attached to a vehicle, comprising:
- a base;
- a case that forms an accommodating space together with the base;
- and
- an antenna disposed in the accommodating space, wherein
- the base includes a conductive base,
- a ground plate is disposed in the base,
- the conductive base and the ground plate are separated from each other,
- the ground plate has a hole formed therethrough, and
- the base further includes a shield cover that is attachable to the hole of the ground plate.
Dependencies are inferred from the claim text.