A dielectric cone radiator sub-reflector assembly for a reflector antenna with a waveguide supported sub-reflector is provided as a unitary dielectric block with a sub-reflector at a distal end. A waveguide transition portion of the dielectric block is dimensioned for coupling to an end of the waveguide. A dielectric radiator portion is provided between the waveguide transition portion and a sub-reflector support portion. An outer diameter of the dielectric radiator portion is provided with a plurality of radial inward grooves and a minimum diameter of the dielectric radiator portion is greater than of a sub-reflector diameter of the sub-reflector support surface.

A scan range of a steerable antenna is extended using a reflecting surface or surfaces within the scan range. Various implementations may also include lenses, and the reflecting surface, lenses, or both may include meta-materials. The antenna may be steered to interact with the reflecting surface, lenses, or both to reflect the beam in a direction not possible using the antenna alone. The scan range may be extended in azimuth, elevation, or both, and beam pattern, and antenna freespace impedance may be controlled.

A multiple-feed antenna system includes a primary reflector that directs signals along a primary RF signal path and a subreflector assembly movable between a first position and a second position. When the subreflector assembly is in the first position, the subreflector assembly redirects signals traveling along the primary RF signal path to a first RF signal path. When the subreflector assembly is in the second position, the subreflector assembly redirects signals traveling along the primary RF signal path to a second RF signal path. The multiple-feed antenna system further includes: a first feed that intersects the first RF signal path and that communicates signals within a first frequency range; a second feed that intersects the second RF signal path and that communicates signals within a second frequency range; and an actuator that moves the subreflector assembly to the first position and to the second position.

Enclosures for radios, parabolic dish antennas, and side lobe shields are provided herein. A dish antenna includes a parabolic circular reflector bounded by a side lobe shield that extends along a longitudinal axis of the dish antenna in a forward direction forming a front cavity, and a sidewall that extends along the longitudinal axis of the dish antenna in a rearward direction forming a rear cavity.

Enclosures for radios, parabolic dish antennas, and side lobe shields are provided herein. A dish antenna includes a parabolic circular reflector bounded by a side lobe shield that extends along a longitudinal axis of the dish antenna in a forward direction forming a front cavity, and a sidewall that extends along the longitudinal axis of the dish antenna in a rearward direction forming a rear cavity.

A multi-band ground antenna with a nested concentric coaxial feed assembly is disclosed for supporting multiple frequency bands. The nested concentric coaxial feed assembly is attached to an antenna reflector through an attachment unit. The nested concentric coaxial feed assembly is located at a reflector focal point. The nested concentric coaxial feed assembly comprises an elongated housing, a feed cone, and a sub-reflector. The nested concentric coaxial feed assembly operates seamlessly across a wider bandwidth, without any gaps or performance drops. The multi-band ground antenna with multiple bands is being introduced for ground communications. The multi-band ground antenna comprises a nested concentric coaxial feed assembly, which supports a wide range of frequencies varies between 2 GHz and 36 GHz. The multi-band ground antenna is designed to be used in satellites and aircraft.

An antenna assembly includes a main reflector, and a subreflector spaced from the main reflector. The subreflector includes a frequency selective surface (FSS) material that is reflective for a first frequency band and transmissive for both a second frequency band and a third frequency band. A first antenna feed is adjacent the main reflector and is directed toward the subreflector. The first antenna feed is for the first frequency band. The second and third antenna feeds are arranged in a coaxial relationship and are directed toward the main reflector with the subreflector therebetween. The second and third antenna feeds are for the second and third frequencies, respectively.

Devices describe herein are configured to radiate radio frequency (RF) energy corresponding to RF signals from a first range of frequencies. The device comprises a patch antenna assembly comprising a microstrip disposed on a printed circuit board and a patch antenna. The device also includes a transmitter configured to generate RF signals from the first range of frequencies at an output of the transmitter and a center feed assembly comprising a waveguide, a lens and the patch antenna assembly disposed in the waveguide. The center feed assembly is configured to radiate from the lens radio frequency (RF) energy corresponding to RF signals from first range of frequencies at a power level greater than the first power level.

A sensor for a missile seeker includes a primary, concave, reflector that is reflective to RF waves and to another kind of waves, but that includes a transmissive region, through which RF waves can pass. A secondary, convex, reflector is reflective to RF waves but transmissive, and not reflective, to the other kind of waves, and is arranged facing the primary reflector to further reflect RF waves reflected by the primary reflector through the transmissive region of the primary reflector. An RF detector is arranged on the opposite side of the primary reflector from the secondary reflector and arranged to detect the RF waves reflected by the secondary reflector through the transmissive region of the primary reflector. A second detector, for detecting the other kind of waves, is arranged on the opposite side of the secondary reflector from the primary reflector and is arranged to detect the other kind of waves after they are reflected by the primary reflector and transmitted through the secondary reflector.

An antenna device capable of performing precise positioning by using a small number of components and having a low side-lobe characteristic is provided. An antenna device includes a primary radiator (3), a main-reflector (2), a sub-reflector (5), and a holding section (4) that fixedly maintains relative positions and directions of the sub-reflector (5) and the main-reflector (2). The holding section (4) includes a side part (42) in an integrated manner, the side part (42) being configured to enclose at least a part of a radio-wave path extending from the primary radiator (3) to the sub-reflector (5) as a shroud.