Provided are examples of removable circularly polarized antenna fitment and methods of fabrication. In one aspect, a fitment comprises a plurality of conductive elements spaced radially around a central point contained with a housing. The elements may have an included angle of between 8 and 71 degrees from horizontal. The plurality of conducting elements may be straight, bent, or curved and may be comprised of between 3 and 12 conductors. The fitment may contain a housing which is removable from a linear antenna.

In accordance with one or more embodiments, a communication device includes a dielectric antenna having a feed point and an aperture. A cable comprising a conductorless core is coupled to the feed point of the dielectric antenna. A transmitter is coupled to the cable and facilitates a transmission of first electromagnetic waves to the feed point of the dielectric antenna. The first electromagnetic waves are guided by the conductorless core and propagate along the conductorless core without requiring an electrical return path, and the first electromagnetic waves generate free-space wireless signals from the aperture of the antenna in accordance with a circularly polarized antenna beam pattern.

An antenna system includes: an antenna, the antenna configured to combine the feed elements to form a high gain element beam (HGEB), the system further configured to combine the HGEBs to form a large coverage beam; and a feed array configured to transfer a signal to the antenna, the feed array being defocused from a focal plane of the antenna by a defocus distance, the feed array comprising a number N of feed elements.

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for producing meander-line polarizers. In some implementations, a meander-line polarizer includes a dielectric substrate made of a polyester polymer material and meander-line arrays formed on a surface of the dielectric substrate. Each meander-line array includes a sequence of alternating perpendicular conductive traces that are formed the surface of the dielectric substrate by applying conductive ink to the surface of the dielectric substrate using a template that defines a location and dimensions of each conductive trace of each meander-line array.

An adjustable polarization converter and an electronic device are provided. The adjustable polarization converter includes a first substrate, a second substrate, and a liquid crystal layer between the first substrate and the second substrate. The first substrate includes a first base substrate and a first electrode on the first base substrate; the second substrate includes a second base substrate and a second electrode on the second base substrate. The first electrode includes a conductive frame and two triangular conductive patches. The conductive frame includes two openings disposed in sequence, and the two triangular conductive patches are disposed in a region surrounded by the conductive frame and are centrally symmetric.

An antenna array includes multiple array modules. Each array module includes at least on antenna element including a horn antenna coupled to a polarizer, and a two-piece waveguide filter. The two-piece waveguide filter includes a folded-back waveguide coupled to the horn antenna at one end and to a circuit layer at the other end. The horn antenna includes a multi-mode horn antenna. The two-piece waveguide filter includes a first piece and a second piece that are separately molded. A footprint of the two-piece waveguide filter is within a footprint of an aperture of the horn antenna.

The present invention provides an antenna structure, an antenna device and a wireless localization method. The antenna structure includes a first radiation unit including a plurality of first connecting portions and a plurality of first annular radiation portions, a second radiation unit including a plurality of second connecting portions and a plurality of second annular radiation portions, a first conductive wire and a plurality of second conductive wires. A first end of each first annular radiation portion is connected to the first connecting portion, and the second end thereof extends towards the first end of the adjacent first annular radiation portion. A first end of each second annular radiation portion is connected to the second connecting portion, and the second end thereof extends towards the first end of the adjacent second annular radiation portion.

An integrated horn antenna with an integral polarization converter, and a method of manufacturing the integrated horn antenna are disclosed. The integrated horn antenna includes a horn, and a polarizer of which at least a portion is disposed in an internal space defined by an inner wall of the horn.

An apparatus comprises: a polarization generator to receive first and second signals, apply to the first and second signals two-dimensional (2D) complex weights to produce 2D weighted complex signals that represent a polarization having a plane of polarization referenced to three-dimensional (3D) orthogonal axes, operate on the 2D weighted complex signals to rotate the plane of polarization angularly with respect to the 3D orthogonal axes, and produce 3D controlled complex signals representing the polarization with the rotated plane of polarization; quadrature upconverter-modulators to modulate the 3D controlled complex signals, to produce 3D modulated radio frequency (RF) signals; and a triaxial antenna including orthogonal 3D linearly polarized elements to receive respective ones of the 3D modulated RF signals and collectively convert the 3D modulated RF signals to radiant RF energy that has the polarization with the rotated plane of polarization.

A polarizing reflector for broadband antennas includes a flat dielectric substrate, a patch array layer formed by a bi-dimensionally periodic lattice of thin metallic patches along first and second perpendicular directions x, y, and a ground layer. All the patches have a same shape elongated along the second direction y and form electric dipoles when electrically excited along the second direction y. For each row the patches of the said row are interconnected by an elongated metallic strip oriented along the first direction x and having a width c. The geometry of the patch array, the thickness h and the dielectric permittivity .sub.r of the substrate, and the width c of the elongated metallic strips are tuned so that the patch array including the elongated metallic strips induces a fundamental aperture mode and a complementary fundamental dipolar mode along two orthogonal TE and TM polarizations within a single operating frequency band or two separate operating frequency bands, and the differential phase between the two fundamental modes over the single or the first and second frequency bands being equal to +90 or to an odd integer multiple of 90. The polarizing reflector can comprise also a curved substrate and a patch array layer formed by a bi-dimensionally lattice of metallic patches along first curvilinear rows and second curvilinear columns.