A slotted Substrate Integrated Air Waveguide (slotted SIAW) antenna array comprising a ground plane having a reflective planar surface formed of a conductive material; an air waveguide structure fixably attached to, or formed onto, the reflective surface of the ground plane and having a slotted aperture defined, in part, by two conductive side walls that terminates at a conductive end wall, where a portion of the conductive side walls and a portion of the conductive end wall define an aperture-facing radiative conductive surface of the aperture and electrically couples with a conductive antenna feedline; and a slotted cover plate fixably attached to, or formed onto, the slotted-waveguide structure and having an area that fully covers the slotted aperture and has two or more radiating slotted apertures coincident to the slotted aperture and to the reflective planar surface of the ground plane.

This document describes techniques and apparatuses for a plastic air-waveguide antenna with conductive particles. The described antenna includes an antenna body made from a resin embedded with conductive particles, a surface of the antenna body that includes a resin layer with no or fewer conductive particles, and a waveguide structure. The waveguide structure can be made from a portion of the surface on which the embedded conductive particles are exposed. The waveguide structure can be molded as part of the antenna body or cut into the antenna body using a laser, which also exposes the conductive particles. If the waveguide is molded as part of the antenna body, the conductive particles can be exposed by an etching process or by using the laser. In this way, the described apparatuses and techniques can reduce weight, improve gain and phase control, improve high-temperature performance, and avoid at least some vapor-deposition plating operations.

This document describes a waveguide with a beam-forming feature with radiation slots. The beam-forming feature of the waveguide includes recessed walls surrounding a plurality of radiation slots. The recessed walls of the waveguide may be walls of equal height and width, or they may include further features that manipulate the beam being formed for certain applications. Some examples of these further features are the inclusion of a choke on one wall, one wall having a height greater than a parallel wall, or the walls either including a step or a taper, such that the beam-forming feature is narrower near the surface of the waveguide with the radiation slots and wider further from the surface of the waveguide with the radiation slots. The beam-forming feature may reduce grating lobes in the radiation pattern thereby improving accuracy and performance of the host system.

An antenna system includes: a first sub-system comprising at least one first antenna element shaped and disposed to have a first electrical polarization, in a first direction, in response to excitation of the first sub-system; and a second sub-system comprising at least one second antenna element shaped and disposed to have a second electrical polarization, in a second direction, in response to excitation of the second sub-system; where the at least one first antenna element and the at least one second antenna element are complementary antenna elements; and where the first sub-system and the second sub-system are co-located such that first sub-system and the second sub-system in combination provide a slant-polarization for the antenna system.

The present invention provides a feed circuit capable of enhancing a mechanical strength and electrical characteristics thereof. A waveguide is provided on a plate-like member, and has a plurality of branches. A bridging part-extends in a Y direction intersecting an X direction in which the waveguide-guides an electromagnetic wave between sidewalls of the waveguide (14), and includes a plurality of members provided at predetermined intervals in the X direction so that intensity of a reflected wave becomes a predetermined intensity or less.

An electromagnetic band-gap (EBG) structure includes an antenna substrate layer, first conductive regions, and second conductive regions. The antenna substrate includes a first planar surface and a second planar surface. The first conductive regions are located on the first planar surface of the antenna substrate and separated from adjacent first conductive regions by a first distance. The second conductive regions are located on the first planar surface of the antenna substrate and are separated from the first conductive regions by a second distance and wherein the second conductive regions at least partially surround the first conductive regions.

Antenna assemblies for vehicles, such as RADAR sensor antenna assemblies, and related waveguide assemblies. In some embodiments, the assembly may comprise a waveguide groove having a waveguide ridge positioned therein. The waveguide groove may extend along an axis with the waveguide ridge intermittently extending on opposite sides of the axis in a periodic or at least quasiperiodic manner along at least a portion of the waveguide ridge. An antenna structure, such as a plurality of slots, may be operably coupled with the waveguide ridge and may be positioned and configured to deliver electromagnetic radiation from the waveguide groove therethrough.

A wireless device includes a shell and an array antenna. The shell is configured with a low reflection structure. The array antenna disposed inside the shell, and the low reflection structure is located within a radiation range of the array antenna after beam scanning. The low reflection structure includes a plurality of slots arranged periodically.

This document describes a waveguide with radiation slots and parasitic elements for asymmetrical coverage. An apparatus may include a waveguide for providing asymmetrical coverage in an azimuth plane. The waveguide includes a hollow channel containing a dielectric and an array of radiation slots through a surface that is operably connected with the dielectric. The waveguide includes an array of parasitic elements positioned on or in the surface and offset from a longitudinal side of the array of radiation slots. The radiation slots and parasitic elements configure the described waveguide to focus an antenna radiation pattern that provides an asymmetrical coverage to focus on a particular portion within the antenna field-of-view.

An electromagnetic band-gap (EBG) structure includes an antenna substrate layer, first conductive regions, and second conductive regions. The antenna substrate includes a first planar surface and a second planar surface. The first conductive regions are located on the first planar surface of the antenna substrate and separated from adjacent first conductive regions by a first distance. The second conductive regions are located on the first planar surface of the antenna substrate and are separated from the first conductive regions by a second distance and wherein the second conductive regions at least partially surround the first conductive regions.