There is disclosed a fluid and/or material detection device (2) comprising an electromagnetic transmitter and/or receiver arrangement (4) comprising a cable (6) or transmission line that acts as an antenna (e.g., transmitter and/or receiver). The device (2) comprises a liquid level detection device and/or particulate (particulate containing fluid) detection device. At least a portion of the cable (6) is rigid/stiff, e.g., at least a portion of the cable (6) having a length of from 0.1 meters to 10 meters. The cable (6) advantageously comprises a coaxial cable or triaxial cable, a radiating cable (RC) or a leaky feeder (LF). The device (2) finds use in an enclosed structure (36), e.g., a cased borehole or well, which can be sealed or unsealed during use of the device (6). The enclosed structure (36) provides a space (34), e.g., an annulus between a production tubing and a wellbore casing or a bore of a production tubing. There is also disclosed a method of detecting and/or determination and/or measuring and/or monitoring a level and/or position of a fluid and/or material or fluid interface within the space (34), the method comprising: providing the device (2); transmitting and/or receiving an electromagnetic signal or signals from and/or at/by the device (2). The method beneficially comprises detecting, locating, establishing and/or measuring a fluid level or liquid level and/or interface of a fluid or liquid using a technique comprising: Frequency Domain Reflectometry (FDR).

The present disclosure relates to an antenna apparatus. The antenna apparatus may include a first substrate; a second substrate opposite the first substrate; a first antenna layer; an insulating layer; and a conductive layer. The first antenna layer may comprise a plurality of antenna units, each of the plurality of antenna units may comprise a radiation patch and is configured to receive the signals in one of the different frequency ranges. The insulating layer may comprise a plurality of sub-insulating layers; the conductive layer may comprise a plurality of conductive electrodes; and the plurality of the sub-insulating layers, the plurality of the conductive electrodes, and the plurality of the antenna units may be in one-to-one correspondence. The radiation patch, at least one of the plurality of conductive electrodes, and at least one of the plurality of sub-insulating layers may constitute a rectifier diode structure.

An antenna for a smart sensor device includes a generally circular, substantially rigid substrate and a radiative antenna element integrated with the substrate. According to one embodiment, the antenna element is a primary cellular antenna arranged to pass signals at frequencies between 600 MHz and 3 GHz. According to another embodiment, a second radiative antenna element may be integrated with the substrate. In such a case, the second antenna element may be arranged to receive location-based signals from satellites or operate as a cellular diversity antenna arranged to receive cellular signals present in proximity to the antenna. The substrate may include at least one interruption (e.g., aperture or lens) arranged to permit light to reach an area inside the sensor device that would otherwise be shielded by the substrate. In such a case, the radiative antenna element(s) may be integrated with the substrate so as to avoid the interruption.

A radar level gauge system for determining the filling level of a product in a tank, comprising a transceiver, an elongated propagation device, and processing circuitry coupled to the transceiver for determining the filling level. The propagation device comprises a first propagation device part comprising a cuff portion; and a second propagation device part comprising an end portion inserted in the cuff portion and joined together with the cuff portion by at least a first fastening arrangement. The first fastening arrangement comprises: a tab formed in one of the cuff portion and the end portion; and a recess formed in the other one of the cuff portion and the end portion. The tab is received by the recess to interact with the recess to prevent relative movement between the first propagation device part and the second propagation device part at least in the longitudinal direction.

An apparatus comprises a structure including a cavity that, when excited with electromagnetic energy, produces an electric field having randomized distribution of field amplitude and polarity. The apparatus further comprises a sensor within the cavity. The sensor has a plurality of antennas for wirelessly harvesting operating power along different paths within the cavity.

Disclosed is a system and method for wirelessly monitoring process conditions within a reactor vessel. A sensor-enabled radio frequency identification tag is located within a catalyst bed of a vessel and used to measure various conditions within the vessel. The sensor-enabled RFID tag is wirelessly linked to a reader for transmitting interrogation signals and for receiving transponder signals from the sensor-enabled RFID tag that carry information representative of the measured condition.

Examples of a leak detection system are disclosed. In one example according to aspects of the present disclosure, a leak detection system includes a housing defining an interior, the housing connected to a component of a water distribution system. The leak detection system also includes a leak detection sensor contained within the interior of the housing and configured to detect a leak within the water distribution system. Additionally, the leak detection system includes a digital signal processing circuit in communication with the leak detection sensor.

A galvanic isolator includes a multi-layer printed circuit board (PCB) including a dielectric material having a top side and a bottom side. An RF transmission line is embedded within the PCB including a plurality of conductor traces spaced apart from one another to include a plurality of gaps (G1 and G2) in a path of the RF transmission line to provide an inline distributed capacitor that together with an impedance of the RF transmission line forms a bandpass (BP) filter. A top metal layer is on the top side and a bottom metal layer on the bottom side connected to one another by a plurality of metal filled vias on respective sides of the RF transmission line. The top metal layer and bottom metal layer each also include at least one gap.

A guided wave radar level measurement device includes a process connection composed of an outer conductor and a central conductor. The central conductor is surrounded at least in part by a dielectric material. One or more resilient metal seals can be employed to form a hermetic seal around a portion of the probe. The metal seal protects the dielectric material such that the hermetic seal is isolated from process and temperature shock. The metal seal(s) can be further mated with one or more insulators and one or more gaskets, the metal seal(s) to provide a thermal and mechanical barrier as well as offering chemical resistance to the guided wave radar level measurement apparatus.

A fill level measurement device for determining a topology of a filling material surface is provided, including an antenna apparatus including an array of radiator elements and a rotatable mount configured to rotate the antenna apparatus about an axis that is in parallel with the array, such that a plurality of emission angles of the antenna apparatus are electronically and mechanically settable relative to the filling material surface without local overscanning occurring.