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An aspect of an antenna apparatus according to the present invention is provided with a conductor plate, radiating elements disposed to face the conductor plate and partially short-circuited to the conductor plate, a feeding terminal provided on the conductor plate, and a feeding path connecting the

An aspect of an antenna apparatus according to the present invention is provided with a conductor plate, radiating elements disposed to face the conductor plate and partially short-circuited to the conductor plate, a feeding terminal provided on the conductor plate, and a feeding path connecting the feeding terminal and a feeding portion of the radiating elements to each other.

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1. An antenna apparatus comprising: a conductor plate;an antenna element arranged to face the conductor plate and partially short-circuited to the conductor plate;a feeding terminal provided on the conductor plate; anda feeding path connecting electrically the feeding terminal and a feeding portion

1. An antenna apparatus comprising: a conductor plate;an antenna element arranged to face the conductor plate and partially short-circuited to the conductor plate;a feeding terminal provided on the conductor plate; anda feeding path connecting electrically the feeding terminal and a feeding portion of the radiating element to each other,wherein the antenna element comprises a plurality of plate-like radiating elements and a ring-shaped element, the plate-like radiating elements extending radially from the feeding portion at equal circumferentially spaced intervals and being short-circuited to the conductor plate at distal ends thereof, respectively, and the ring-shaped element comprises a plurality of line paths connecting distal end portions of adjacent plate-like radiating elements of the plurality of line paths. 2. The antenna apparatus according to claim 1, further comprising at least one passive element arranged on the conductor plate alongside the feeding path and comprising a metal plate having a vertical portion electromagnetically-coupled to the feeding path and a horizontal portion that is capacitance-coupled to the feeding portion or plate-like radiating elements near the feeding portion. 3. The antenna apparatus according to claim 1, wherein the feeding path has such a shape that a width thereof is expanded from the side of the feeding terminal toward the side of the feeding portion. 4. The antenna apparatus according to claim 3, wherein the feeding terminal is provided at a central portion of the conductor plate; and wherein the feeding path has one end connected to the feeding terminal and another end capacitance-coupled to a feeding portion of the radiating element. 5. The antenna apparatus according to claim 3, wherein one end of the feeding path is directly connected to the feeding portion. 6. The antenna apparatus according to one of claims 2 to 5, wherein the conductor plate further includes a plurality of matching plates near the short-circuiting portion of the radiating elements, respectively. 7. The antenna apparatus according to claim 6, wherein the plurality of matching plates is formed by bending corners of the conductor plate upwardly away from the conductor plate. 8. The antenna apparatus according to one of claims 1 to 5, wherein the short-circuiting portions of the radiating element are provided on the circumference of a circle about the feeding path at equal intervals. 9. The antenna apparatus according to one of claims 1 to 5, wherein the radiating element is defined as a first radiating element and a second radiating element having a facing distance between the conductor plate and the second radiating element shorter than a facing distance between the conductor plate and the first radiating element is further disposed between the conductor plate and the first radiating element. 10. The antenna apparatus according to one of claims 2 to 5, wherein a plane area of the conductor plate is formed in a square shape with side length of 0.5 λ or more, wherein the plurality of line paths are set to about λ/4, and wherein a facing distance between the conductor plate and the radiating element is set to about λ/10 to λ/16 or about λ/18, where λ is a wavelength of a lowest frequency in a working frequency band. 11. The antenna apparatus according to claim 3, wherein the width of the feeding path is represented by an exponent function curve or a semi-elliptical shape. 12. The antenna apparatus according to claim 11, wherein the exponent function curve or the semi-elliptical shape is approximately formed by stacking a plurality of circular metal plates having different diameters.