This document describes apparatuses, methods, and systems for a hybrid horn waveguide antenna. The hybrid horn waveguide antenna includes a waveguide, described in two sections, and an antenna section having both flaring features and step features. The first waveguide section is electrically coupled to a transmitter/receiver (e.g., transceiver) and defines an energy path along an x-axis. The second waveguide section transitions the energy path to travel along a z-axis. The antenna section has a first aperture that is coupled to the second waveguide section and includes flaring wall features in one plane (e.g., the E-plane) and step features in a second plane (e.g., the H-plane). The waveguide may further include an iris between the first waveguide section and the second waveguide section. Further, the hybrid horn waveguide antenna section may be formed from an upper structure and a lower structure manufactured via injection molding and then mated.

A compact broadband circularly polarized antenna includes an antenna body, wherein a cavity is formed in the antenna body, a plurality of ridges and a plurality of baffles are formed inside the cavity, the ridges are configured for antenna miniaturization and bandwidth widening, and the baffles are configured to form a spatial phase difference. In the present disclosure, the ridges of the circularly polarized antenna are divided into two parts, wherein the ridges located in a baffle mounting rectangular section and a front rectangular mounting section are configured for antenna miniaturization and bandwidth widening, and the baffles for forming a phase difference are arranged between the ridges located in the baffle mounting rectangular section. Through the above arrangement, the polarized antenna may be miniaturized, operate in a millimeter wave band, and achieve circular polarization; the bandwidth of the antenna is relatively wide.

A liquid level sensing apparatus (10) for long-distance automatically enhancing a signal-to-noise ratio is applied to a measured target (20). The liquid level sensing apparatus (10) includes a sensing module (102), a long-distance command receiving module (104) and at least a brake module (106). The sensing module (102) transmits a sensing signal (108) to the measured target (20). The sensing signal (108) touches the measured target (20) to reflect back a reflected signal (110). The sensing module (102) receives the reflected signal (110) to measure the signal-to-noise ratio and to measure a height of the measured target (20). The long-distance command receiving module (104) is electrically connected to the sensing module (102). The long-distance command receiving module (104) receives a long-distance command signal (302). The brake module (106) is mechanically connected to the sensing module (102).

The present application provides an integrated antenna and an antenna apparatus. The integrated antenna includes an antenna substrate, a photodiode and an antenna radiating body. The photodiode is disposed on the antenna substrate and includes two electrodes. The antenna radiating body is disposed on the antenna substrate and connected with the two electrodes. The antenna radiating body is disposed on an upper surface of the photodiode.

A radiating element may comprise an antenna element, a radiating element edge, and a corrugation. The antenna element may have an aperture that extends into the antenna element, and an aperture side defining an aperture area of the antenna element. The radiating element edge may surround the antenna element on the aperture side. The corrugation may be configured to separate, at least on the aperture side, the antenna element and the surrounding radiating element edge. The radiating element edge may be connected to the antenna element at a distance greater than zero from the aperture side of the antenna element.

An array of antenna feed elements includes a plurality of horns, each horn having an aperture and configured for transmission of electromagnetic energy therethrough. At least a first horn is configured with an electrically conductive external surface proximate to the aperture, the external surface contoured so as to reduce mutual coupling between the first horn and an adjacent horn. Where the electromagnetic energy is within a radio frequency (RF) band, the external surface is contoured so as to provide an abrupt change in a gap dimension between the first horn and an adjacent horn, the change occurring at a distance behind the aperture of equal to a multiple of one half the characteristic wavelength of the RF band.

Provided is a system for contactless signal transmission through a rotary joint including a transmitter on a first part of the rotary joint and a receiver on a second part of the rotary joint, the first and second parts being opposite and separated by an air gap, surfaces of the first and second parts facing each other being perpendicular to a rotation axis of the rotary joint, and a choke in the air gap contacting one of the first and second parts, the choke including a printed circuit board having a through hole coaxial with the rotation axis, and an electromagnetic chip, each of the transmitter and the receiver includes a hollow waveguide, at least the transmitter includes in a waveguide polarizer, a diameter of the waveguide polarizer being smaller than a diameter of the round hollow waveguide, and two longitudinal diametrically opposite grooves in walls of the waveguide polarizer.

An antenna device for establishing a wireless coupling to a device under test has an antenna structure, and a first blind mating waveguide flange coupled to the antenna structure, wherein the first waveguide flange comprises a ridged waveguide structure with at least two ridges.

An antenna device includes: waveguide sections; a partition wall section disposed to partition the waveguide sections; radiation aperture sections connected to the waveguide sections, respectively; and a distribution section including a feeding aperture through which radio waves are introduced and forming a distribution waveguide to each of the waveguide sections. The waveguide sections extend in a first direction, and are arranged in a second direction. The positions of two of the radiation aperture sections are shifted from each other in the first direction. The distribution section is formed by being folded back from the one side to the other side in the first direction to make phases of the radio waves opposite to each other.