Antenna apparatus
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiroki Okada, Tetsuya Kobayashi
Life of this patent
Estimating the term…
Abstract
An antenna apparatus includes an antenna, and a resin material provided between the antenna and a reflector (windshield). The resin material includes portions, and the thickness (or dielectric constant) of each portion of the resin material is determined in accordance with a length of a straight line connecting a feeding point of the antenna, each portion of the resin material, and the reflector. Therefore, a phase of a reflected wave can be easily adjusted, thereby improving a performance of the antenna.
Claims8
An antenna apparatus comprising:
- a first antenna;
- a reflector;
- and
- a resin material corresponding to an instrument panel positioned between the first antenna and the reflector,
- wherein the resin material has portions, and at least one of the thickness and the dielectric constant of the resin material is determined for each portion such that an absolute phase difference among the reflected waves obtained by reflecting, by the reflector, the direct wave which has been radiated from a feeding point of the antenna and has passed through the portions of the resin material is smaller than an absolute phase difference among the reflected waves obtained when each of the thickness and the dielectric constant is uniform in each portion of the resin material, and
- wherein the antenna is provided in the instrument panel.
An antenna apparatus comprising:
- a first antenna;
- a second antenna which is different from the first antenna;
- a reflector;
- a resin material positioned between the first antenna and the reflector, wherein the resin material has portions, and at least one of the thickness and the dielectric constant of the resin material is determined for each portion such that an absolute phase difference among the reflected waves obtained by reflecting, by the reflector, the direct wave which has been radiated from a feeding point of the antenna and has passed through the portions of the resin material is smaller than an absolute phase difference among the reflected waves obtained when each of the thickness and the dielectric constant is uniform in each portion of the resin material;
- and
- a holder for holding the first antenna and the second antenna, wherein at least one of the thickness and the dielectric constant of the resin material is determined for each portion in accordance with a length of a straight line connecting a feeding point of the second antenna, a corresponding one of the portions of the resin material, and the reflector.
An antenna apparatus comprising:
- a first antenna;
- a reflector;
- a resin material positioned between the first antenna and the reflector, wherein the resin material has portions, and at least one of the thickness and the dielectric constant of the resin material is determined for each portion such that an absolute phase difference among the reflected waves obtained by reflecting, by the reflector, the direct wave which has been radiated from a feeding point of the antenna and has passed through the portions of the resin material is smaller than an absolute phase difference among the reflected waves obtained when each of the thickness and the dielectric constant is uniform in each portion of the resin material;
- and
- an instrument panel positioned between the resin material and the reflector.
Dependencies are inferred from the claim text.