An apparatus for space and terrestrial communication applications includes a Ka-band horn combined with a S-band cross-polarization cup. The S-band cross-polarization cup is placed around a neck of the Ka-band horn in a form of a collar.

The present invention relates to a base station antenna. The base station antenna comprises: a reflector that is configured to provide a ground plane; a first radiating element array including at least one first cross-polarized radiating element that is arranged on the reflector; and a first parasitic element array including first through third parasitic element pairs, wherein each of the first through third parasitic element pairs includes a pair of parasitic elements that are arranged substantially symmetrically on both sides of the first longitudinal axis, and distances from the first through third parasitic element pairs respectively to the first longitudinal axis increase sequentially, wherein projections of any two of the first parasitic element pair, the second parasitic element pair, the third parasitic element pair, and the at least one first cross-polarized radiating element on the first longitudinal axis at least partly overlap.

The application discloses a wideband dual-polarized antenna, including a reflective plate and a radiating element mounted on the reflective plate. The radiating element includes four dipoles which are combined together to be arranged on the reflective plate; two arms of each dipole are respectively connected to top ends of two conductor, and bottom ends of the conductor are connected to a common base and are placed on the reflective plate; a focusing member with a conical structure is mounted above the radiating element, and includes conductive members and dielectric members. The conductive members are arranged on the dielectric members in an axisymmetrical manner, are supported by the dielectric members and are arranged above the dipoles. The beamwidth is adjusted by arranging the focusing member with the conical structure above the radiating element so that the wideband dual-polarized antenna has the beamwidth reaching the desired range, has lower cross polarization ratio.

Systems, methods, and devices relating to antennas. A crossed dipole antenna element has a ring encircling the antenna. The ring, constructed of a conductive material, is not touching the arms of the dipole antenna and the distance between the ring and the arms of the antenna can be optimized. The antenna element assembly can be used in one or two dimensional antenna arrays.

A device is presented for improving radio frequency (RF) and microwave array antenna performance. The device sits in the near field, the reactive region, of the antenna array with a pattern of electrically isolated rectangular, cross-shaped, ell, and/or similarly-shaped patches of flat metal or other conductor in a flat plane. The patches are segmented into smaller shapes no greater than 0.3 of a shortest wavelength of the nominal operating range of the antenna and/or the height of the plane is greater than 0.25 and/or less than 0.4 of the center frequency's wavelength. Mutual coupling S-parameters between neighboring elements are either simulated or measured, and the patch sizes or height are designed such that |S.sub.21.sup.Refl| is in a range of |S.sub.21.sup.Array|±20% of |S.sub.21.sup.Array|; and Phase(S.sub.21.sup.Refl) is in a range of Phase(S.sub.21.sup.Array)+180±30 degrees, where S.sub.21.sup.Array is an S-parameter between antenna two neighboring antenna elements measured or simulated without the device, where S.sub.21.sup.ADS is the same with the device, and S.sub.21.sup.Refl=S.sub.21.sup.ADS−S.sub.21.sup.Array.

This document describes a twin line fed dipole array antenna that may be coupled to several different types of feed networks in a space-efficient manner. The antenna makes use of a twin line feed to a plurality of dipoles that minimizes cross-polarization. The antenna may be manufactured on a printed circuit board (PCB) and has a centered feed slot that is easily coupled to several different types of waveguides or a microstrip. In some implementations, the dipole elements may have an approximately rectangular shape. In other implementations, the dipole elements may have an approximately bowtie shape, round shape, oval shape, C-shape, or L-shape. The size and placement of the dipole elements may be optimized for certain operating frequencies of the radar system to which the antenna is coupled.

Disclosed are devices and methods for selecting, at an antenna reflector, electromagnetic waves with a certain polarization and frequency and rejecting electromagnetic waves with different polarizations and/or frequencies. In one aspect, a directional antenna includes a shaped reflector surface with a series of conforming layers attached to the surface. The layers include a reflecting layer that causes reflection of electromagnetic waves at a specific frequency and polarization. Underneath the reflecting layer is a frequency selective surface (FSS) layer that absorbs electromagnetic waves not at the specific frequency or polarization which pass through the reflecting layer. Underneath the absorbing layer is a conductive layer.

A base station antenna radiator comprises: a first balun substrate, on an upper surface of which a feed line, a first C-coupling member, and a first inductive filter line connected to the first C-coupling member, and on a lower surface of which a third C-coupling member opposite to the first C-coupling member and a third inductive filter line electrically connected to the first inductive filter line through a first via hole and connected to the third C-coupling member are formed, the first balun substrate being placed perpendicular to a reflector; a second balun substrate coupled orthogonally to the first balun substrate, and on which a metal pattern substantially identical to that of the first balun substrate is formed; and a radiating substrate disposed above the first and second balun substrates, placed parallel to the reflector, and on an upper surface of which at least one radiating patch is formed.

An antenna array capable of full duplex communication is described. The antenna array includes a first dual polarity antenna element and a second dual polarity antenna element. A first conductive structure, extends between the first and second antenna elements along a diagonal axis in common between the first antenna element and the second element, and forms a coupling path between the first and the second antenna elements such that at least a portion of a signal generated by the first antenna element is coupled, via the coupling path, to the second antenna element to at least reduce cross polarity mutual coupling between the first antenna element and the second antenna element.

This document describes a twin line fed dipole array antenna that may be coupled to several different types of feed networks in a space-efficient manner. The antenna makes use of a twin line feed to a plurality of dipoles that minimizes cross-polarization. The antenna may be manufactured on a printed circuit board (PCB) and has a centered feed slot that is easily coupled to several different types of waveguides or a microstrip. In some implementations, the dipole elements may have an approximately rectangular shape. In other implementations, the dipole elements may have an approximately bowtie shape, round shape, oval shape, C-shape, or L-shape. The size and placement of the dipole elements may be optimized for certain operating frequencies of the radar system to which the antenna is coupled.