A communications device includes: an antenna radiating a first radio wave having a first polarization direction and a second radio wave having a second polarization direction, the first and second polarization directions being different; a casing provided with an opening through which the first radio wave and the second radio wave pass; and a cover provided to the opening and including a plurality of bars made of metal. The antenna is disposed so that neither the first polarization direction of the first radio wave nor the second polarization direction of the second wave orthogonally intersects with an extending direction of the bars.

The mode-whisperer waveguide device includes a main waveguide, a junction waveguide and a pair of recombination arm waveguides. The main waveguide features a spline taper extending along an axis of the main waveguide. The spline taper has been integrated with the normal linear aperture taper. The junction waveguide is attached to the main waveguide. The recombination arm waveguides are attached to the junction waveguide. A first port is coupled to the pair of recombination arm waveguides via a pair of recombination arm transformer steps. The main waveguide, the junction waveguide, the pair of recombination arm waveguides and the pair of recombination arm transformer steps are manufacturable as a monolithic waveguide device that is configured to achieve outstanding higher-order mode suppression due to the gradual dual spline taper which has been integrated with the normal linear taper to the aperture port.

An isolator based on a waveguide-based artificial dielectric medium is scalable to a range of desired terahertz frequencies, has non-reciprocal transmission and provides low insertion loss and high isolation at various tunable terahertz frequencies, far exceeding the performance of other terahertz isolators, and rivaling that of commercial optical isolators based on the Faraday effect. This approach offers a promising new route for polarization control of free-space terahertz beams in various instrumentation applications. Artificial dielectrics are man-made media that mimic properties of naturally occurring dielectric media, or even manifest properties that cannot generally occur in nature. A simple and effective strategy implements a polarizing-beam-splitter and a quarter wave plate to form a highly effective isolator. Performance of the device is believed to exceed that of any other experimentally demonstrated method for isolation of back-reflections for terahertz beams.

In an exemplary embodiment, a phased array antenna comprises multiple subcircuits in communication with multiple radiating elements. The radio frequency signals are independently adjusted for both polarization control and beam steering. In a receive embodiment, multiple RF signals of various polarizations are received and combined into at least one receive beam output. In a transmit embodiment, at least one transmit beam input is divided and transmitted through multiple radiating elements, with the transmitted beams having various polarizations. In an exemplary embodiment, the phased array antenna provides multi-beam formation over multiple operating frequency bands. The wideband nature of the active components allows for operation over multiple frequency bands simultaneously.

A combiner network is provided. A combiner network may include a corporate combiner. The corporate combiner may include a first plurality of radiation elements. The corporate combiner may include a first H-plane combiner connected to the first plurality of radiation elements and connected by a U-bend to a first E-plane combiner. The corporate combiner may include a second H-plane combiner connected to the first E-plane combiner. The corporate combiner may further include a first port. A plurality of corporate combiners may be assembled together as a combiner network.

An antenna apparatus includes a first radiation area, a phase adjustment area and a second radiation area. The first radiation area is disposed opposite to the second radiation area. The first radiation area is connected to one end of the phase adjustment area. The other end of the phase adjustment area is connected to the second radiation area. The first radiation area includes a feeding point of the antenna apparatus. The second radiation area includes a ground point of the antenna apparatus. The phase adjustment area is used to adjust a phase of a signal fed by the feeding point, to change a direction of a space electromagnetic field formed by an electromagnetic signal radiated by each of the first radiation area and the second radiation area.

An electronically beam-steerable full-duplex phased array antenna is described. The phased array antenna includes an array of a plurality of radiating elements. The array includes at least one column having a plurality of radiating elements, and the array is configured to generate a radiation field. The phased array antenna includes a metasurface over the array of radiating elements. The metasurface introduces a phase shift to the radiation field of the array, to cause a beam of the phased array antenna to be angularly offset from the radiation field of the array.

Cascaded metasurfaces can control the phase, amplitude and polarization of an electromagnetic beam, shaping it in three dimensional configuration not achievable with other methods. Each cascaded metasurface has dielectric or metallic scatterers arranged in a period array. The shape of the scatterers determines the three dimensional configuration of the output beam and is determined with iterative calculations through computational simulations.

A wireless node described herein transmits and receives high frequency signals with three or more different polarizations simultaneously thereby increasing network capacity. The different polarizations can be achieved by using polarizer sheets and/or orthomode transducer assemblies or Cassegrain antennas with multiple subreflectors.

The present disclosure relates to a feeding structure for an antenna array, an antenna array, and a network node. The antenna array may include a plurality of subarrays each with at least one antenna element. The feeding structure may include at least one transmitting branch and at least one receiving branch for a subarray of the plurality of subarrays. The at least one transmitting branch and the at least one receiving branch may be arranged separately. Thus, feeding structure with specific transmitting branches for improving phase tuning density may be provided by embodiments. The feeding structure for the antenna array may include asymmetrically separated transmitting signal path and receiving signal path. The polarization type of the transmitting can be individually controlled while a pair of orthogonal polarization are realized for receiving. The phase control density can be separately controlled for transmitting and receiving as demand.