A radome-reflector assembly includes a generally domed reflector having a peripheral rim and a radome assembly. The radome assembly includes: an annular ring having a front wall and a side wall; a disk that fits within the ring; and an RF-compliant absorber, wherein the rim of the reflector fits within the side wall. The radome assembly further comprises a clip that engages the rim and the ring to secure the reflector to the radome assembly.

An apparatus and method for mitigating polarization mismatch in reflector antenna systems. A feed unit is configured to determine a polarization mismatch between a first polarization associated with a first wave and a second polarization associated with a reflector unit. The feed unit pre-distorts the first wave to achieve a compensated polarization for reducing and/or eliminating a polarization mismatch. The pre-distorted first wave having the compensated polarization is used to illuminate the reflector unit. A re-radiated wave is reflected by the reflector unit. Furthermore, the level of the re-radiated wave is increased as a result of the pre-distortion.

An antenna device includes: a ground electrode plate; one or more first radiating electrode plates which face the ground electrode plate; a second radiating electrode plate which lies between the ground electrode plate and the one or more first radiating electrode plates; one or more first feeder lines which are connected to the one or more first radiating electrode plates; a second feeder line which is not connected to the one or more first feeder lines but is connected to the second radiating electrode plate; and a ground line which does not connect the one or more first radiating electrode plates to the ground electrode plate but connects the second radiating electrode plate to the ground electrode plate. The one or more first radiating electrode plates lie inside the second radiating electrode plate as viewed from a thickness direction of the ground electrode plate.

An antenna device includes: a ground electrode plate; one or more first radiating electrode plates which face the ground electrode plate; a second radiating electrode plate which lies between the ground electrode plate and the one or more first radiating electrode plates; one or more first feeder lines which are connected to the one or more first radiating electrode plates; a second feeder line which is not connected to the one or more first feeder lines but is connected to the second radiating electrode plate; and a ground line which does not connect the one or more first radiating electrode plates to the ground electrode plate but connects the second radiating electrode plate to the ground electrode plate. The one or more first radiating electrode plates lie inside the second radiating electrode plate as viewed from a thickness direction of the ground electrode plate.

A radiating element comprises a radiator, a feed stalk and a parasitic element. The radiator is fed by the feed stalk, and the parasitic element includes an electrically conductive structure that includes a meandered electrically conductive path. A coupling capacitor is formed between the electrically conductive structure and the radiator, and a center frequency of an operating frequency band of the radiator is higher than a center frequency of a first operating frequency band of the parasitic element.

A radiating element comprises a radiator, a feed stalk and a parasitic element. The radiator is fed by the feed stalk, and the parasitic element includes an electrically conductive structure that includes a meandered electrically conductive path. A coupling capacitor is formed between the electrically conductive structure and the radiator, and a center frequency of an operating frequency band of the radiator is higher than a center frequency of a first operating frequency band of the parasitic element.

An antenna device including: a substrate; a plurality of antenna elements supported by the substrate, each of the antenna elements having a feeding point; and a parasitic element supported by the substrate and having no feeding point, in which the plurality of antenna elements is disposed to be spaced apart from each other along a predetermined direction, the parasitic element is mutually spaced apart in the direction from a first antenna element located on an end side in the direction among the plurality of antenna elements, and a first element interval between the parasitic element and the first antenna element is equal to or less than twice a second element interval between the first antenna element and a second antenna element located on an opposite side of the parasitic element with respect to the first antenna element.

An antenna device including: a substrate; a plurality of antenna elements supported by the substrate, each of the antenna elements having a feeding point; and a parasitic element supported by the substrate and having no feeding point, in which the plurality of antenna elements is disposed to be spaced apart from each other along a predetermined direction, the parasitic element is mutually spaced apart in the direction from a first antenna element located on an end side in the direction among the plurality of antenna elements, and a first element interval between the parasitic element and the first antenna element is equal to or less than twice a second element interval between the first antenna element and a second antenna element located on an opposite side of the parasitic element with respect to the first antenna element.

An antenna and methods of fabricating the antenna and a resonator of the antenna. The antenna includes an antenna feed arranged to emit an electromagnetic signal along a predetermined direction; a resonator disposed adjacent to the antenna feed arranged to improve a directivity of the electromagnetic signal being emitted by the antenna feed; wherein the resonator includes a first reflector and a second reflector sandwiching a resonating cavity therebetween; and wherein the first reflector includes a curved reflector surface.

An antenna device includes a substrate having a base material containing a dielectric and a conductor, a waveguide, an antenna, and a matching portion arranged in the base material as a part of the conductor. The antenna faces the upper wall portion, and has a plurality of patch portions arranged in an array, a plurality of feeding lines extending in a direction from the patch portion and individually provided for the patch portions, and a plurality of short-circuit portions individually provided for the patch portions and electrically connecting the patch portion and the upper wall portion. The upper wall portion has a plurality of openings 34 individually formed with respect to the feeding lines. Each of the feeding lines extends into the waveguide through the corresponding opening.