Antenna device
AssigneeYokowo Co., Ltd.
InventorsBunpei Hara, Seiya Hiroki
Life of this patent
Estimating the term…
Abstract
An antenna device (100) for a vehicle includes an antenna case (101), an antenna base (102) forming an accommodation space together with the antenna case (101), a first antenna element (108) that is accommodated in the accommodation space and that at least transmits or receives a circularly polarized wave; a second antenna element (110) that is arranged close to the first antenna element (108) and that at least transmits or receives a linearly polarized wave; and at least one parasitic element (111), (112a), (112b), or (112c) serving as a reflector or a waveguide for the second antenna element (110).
Claims17
An antenna device comprising:
- a case;
- a base forming an accommodation space together with the case;
- a first antenna element that is accommodated in the accommodation space and that at least transmits or receives a circularly polarized wave;
- a second antenna element that is arranged close to the first antenna element and that at least transmits or receives a linearly polarized wave;
- and
- at least two parasitic elements serving as a reflector or a waveguide for the second antenna element, wherein
- the at least two parasitic elements include at least one first parasitic element and at least one second parasitic element,
- the at least one first parasitic element is arranged on a side opposite to the first antenna element with the second antenna element interposed therebetween and functions as a waveguide for the second antenna element, and
- the at least one second parasitic element is arranged between the first antenna element and the second antenna element and functions as a reflector for the second antenna element.
An antenna device comprising:
- a case;
- a base forming an accommodation space together with the case;
- a first antenna element that is accommodated in the accommodation space and that at least transmits or receives a circularly polarized wave;
- a second antenna element that is arranged close to the first antenna element and that at least transmits or receives a linearly polarized wave;
- and
- at least one parasitic element serving as a reflector or a waveguide for the second antenna element,
- wherein a length of the at least one parasitic element is ½ or less of a wavelength of the circularly polarized wave when ungrounded, and ¼ or less of the wavelength of the circularly polarized wave when grounded.
An antenna device comprising:
- a case;
- a base forming an accommodation space together with the case;
- a first antenna element that is accommodated in the accommodation space and that at least transmits or receives a circularly polarized wave;
- a second antenna element that is arranged close to the first antenna element and that at least transmits or receives a linearly polarized wave;
- and
- at least one parasitic element serving as a reflector or a waveguide for the second antenna element,
- wherein the at least one parasitic element is a linear conductor and includes a bent or curved portion.
Dependencies are inferred from the claim text.