An apparatus includes a first waveguide configured to propagate electromagnetic energy along a propagation direction. The apparatus further includes a first waveguide flange configured to selectively operate in one of a plurality of modes. When operating in a first mode, the apparatus radiates at least a portion of the electromagnetic energy from the first waveguide via at least one radiating feature of the first waveguide flange. The at least one radiating feature is located on a surface of the first waveguide flange that is perpendicular to the propagation direction. Additionally, when operating in a second mode, the apparatus conducts at least a portion of the electromagnetic energy from the first waveguide to a subsequent element (e.g., a second waveguide). The at least one radiating feature is shorted to a portion of the subsequent element when operating in the second mode.

A board to board contactless interconnect system includes a first circuit board for launching at st one microwave signal into a cavity of a first waveguide secured thereto. A second waveguide, secured to a second circuit board, is coupleable to the first waveguide to receive the at least one microwave signal in a cavity of the second waveguide and conduct the at least one microwave signal onto a microwave receiver aligned with the cavity on the second circuit board. The waveguides may be separable and may include additional waveguides. Conductive gaskets with apertures for microwave signals to pass through are positioned between the waveguides and between each circuit board and a waveguide to prevent leakage of microwave energy therebetween. Some embodiments may pass signals through a sealed boundary and maintain integrity of the seal. Such embodiments may have a third waveguide interposed between the first and second waveguides.

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).

An apparatus includes a first waveguide configured to propagate electromagnetic energy along a propagation direction. The apparatus further includes a first waveguide flange configured to selectively operate in one of a plurality of modes. When operating in a first mode, the apparatus radiates at least a portion of the electromagnetic energy from the first waveguide via at least one radiating feature of the first waveguide flange. The at least one radiating feature is located on a surface of the first waveguide flange that is perpendicular to the propagation direction. Additionally, when operating in a second mode, the apparatus conducts at least a portion of the electromagnetic energy from the first waveguide to a subsequent element (e.g., a second waveguide). The at least one radiating feature is shorted to a portion of the subsequent element when operating in the second mode.

The present invention relates to a polarimetric radar, consisting of a transmission assembly that emits circularly polarized waves by means of transmission antennas and a receiver assembly that receives the reflected circularly polarized wave components by means of an antenna assembly. A plurality of two-channel receivers are provided as the receiver assembly, which simultaneously receive clockwise-rotating and anti-clockwise-rotating circularly polarized signal components, which are provided for digital beam shaping downstream of the antenna assembly. The invention further relates to a method for object classification.

An antenna and a combined antenna are provided. The antenna comprises: a housing in which a first port and a second port are formed; a feeding network unit, which is disposed inside the housing and comprises a waveguide power divider connecting the first port and the second port, wherein the waveguide power divider is configured for dividing the electromagnetic wave transmitted from the first port to the second port, or merging the electromagnetic wave transmitted from the second port to the first port; a radiating unit, which comprises a radiator disposed on the housing and close to the second port. The antenna has the advantages of low loss, being suitable for high-power transmission. In addition, the antenna is relatively simple in structure, and therefore, is beneficial to reduce the overall volume of the antenna, so as to meet the miniaturization design requirements of the antenna.

A microwave heating device includes a variable frequency microwave power supply, a waveguide launcher, and a fixture to contain a material to be heated, with the fixture located directly adjacent to the end of the launcher. All heating occurs in the near-field region. This condition may be insured by keeping the thickness of the fixture or workpiece under one wavelength (at all microwave frequencies being used). The launcher is preferably a horn or waveguide configured to apply the microwave power to a small area to perform spot curing or repair operations involving adhesives and composites. The spot curing may secure components in place for further handling, after which a thermal or oven treatment will cure the remaining adhesive to develop adequate strength for service.

A related method is also disclosed.

A right-angle waveguide probe antenna with a bandwidth greater than 15% of the center frequency of the operating band, as defined by a return loss over the frequency range better than or equal to 20 dBV. This invention is most relevant to a right-angle coaxial to an air-filled rectangular waveguide transition. The probe antenna is comprised of a flared section followed by a rectangular section resulting in an irregular convex pentagon shape with two right angles at the base which resembles an A-frame on top of a rectangle. The resultant A-frame probe can be connected to a coaxial feed cable and extended into a waveguide through an aperture. The A-frame probe operates as a TE10 mode waveguide radiator, and is sized and positioned such that the impedance of the probe antenna is closely matched to the impedance of the waveguide across a wider frequency band.