Multiphase flowmeter aperture antenna transmission and pressure retention are disclosed herein. An example apparatus includes at least one radiating element to transmit or receive an electromagnetic signal along a measurement plane orthogonal to a direction of flow of the fluid in the vessel; a pressure retaining member to prevent fluid from entering the aperture antenna assembly through a measurement window of the aperture antenna assembly, at least a portion of the pressure retaining member to separate the radiating element and the fluid; and a metal housing with or without slits, the pressure retaining member to be at least partially within the metal housing, the radiating element to be coupled to the metal housing.

A band antenna EMP filter apparatus having HEMP protection capability is disclosed. The apparatus includes a discharging part, a band pass filtering part, and a residual current eliminating part. The discharging part primarily discharges a transient voltage due to a high altitude electromagnetic pulse (HEMP) when the HEMP is inputted through an input part receiving a radio frequency (RF) signal of an antenna. The band pass filtering part secondarily blocks a residual current primarily discharged by the discharging part and passes only a signal of a preset frequency band to output it through an output part. The residual current eliminating part limits a transient voltage of the HEMP by eliminating a residual current passing through the band pass filtering part.

A device for transferring signals using electromagnetic waves of a certain wavelength and based on a housing formed at least partially of metal for use in an explosion endangered area includes the housing; a transmitting/receiving unit for producing and/or receiving the electromagnetic waves; at least one primary antenna for out-coupling and/or in-coupling of the electromagnetic waves; at least one slot-shaped housing opening; and a formed part, which is made of a material having a dielectric number significantly greater than one and which extends to a predetermined maximum depth into the housing opening.

A base station antenna assembly that may include a base station antenna having a frame and a radome that covers the frame; and a first radio mounted to a radio support plate on a rear side of the base station antenna. The radio support plate may be configured to attach to the base station antenna by at least one guide rail that cooperates with one or more guide structures of the radio support plate. A rear surface of the radome may include a plurality of access holes, and the base station antenna assembly may include a plurality of connectorized cables soldered to components within an interior of the base station antenna that extend from the interior of the base station antenna through respective ones of the access holes.

An antenna for a portable communication device is provided. The antenna comprises an antenna body having an upper section and a lower section with a connection point therebetween. The connection point being configured to: couple the upper and lower sections during normal antenna operation; decouple the upper and lower sections in response to an impact event; and recouple the upper and lower sections after the impact event.

An antenna or radiating element that is constructed of materials allowing for survivability of fire, high temperature, corrosive environments, or any combination of the aforementioned. Antennas are capable of operating for an extended period of time in a high temperature environment with the use of a radome having one or more surfaces covered in one or more of the following surface elements: a polyester film, a moldable plastic film, a boPET product, a ceramifiable silicone rubber material and a ceramic fiber wrap material. The surface elements can be used to construct a portion of the structural components of the antenna.

An insulating glazing unit extends along a plane, P, defined by a longitudinal axis, X, and a vertical axis, Z; having a width, W, measured along the longitudinal axis, X, and a length, L, measured along the vertical axis, Z, and includes a first glass pane that faces outside and has two major surfaces extending along a plane, P. A second glass pane faces inside and has two major surfaces extending along a plane, P. A spacer maintains a distance, D, between the first and second glass panes, creating a space, S. An antenna unit comprises an antenna and is fixed between the first and second glass panes with a fixing portion for fixing the antenna to one of the glass panes and maintaining the antenna at a distance, Da1, from the inner surface of the first glass pane to create a space, SI, through which gas can circulate.

An antenna includes at least one antenna element mounted on a substrate and extending normally thereto. The at least one antenna element is constructed from a plurality of antenna components, one of which is an upper antenna component that is furthest from the substrate. A support material surrounds the at least one antenna element and is disposed between the antenna components. A material layer is disposed on the upper antenna component and the support material. Heating elements may be interposed between the upper antenna component and the material layer, and an additional material layer, such as an ablative layer, may be disposed on the material layer.

An antenna housing is provided that is configured to be mounted to a pole. The antenna housing has spaced upper and lower ends. A sidewall extends between and around the spaced ends to define an interior of the housing. This interior may house and/or partially conceal one or more antennas. Inlet and outlet ducting extend through the sidewall of the housing to individually cool each antenna within the interior of the housing. The inlet and outlet duct may connect to a cooling duct that is in fluid communication with a heat rejection surface of the antenna. Accordingly, each antenna may be cooled using ambient air and the heated air may be exhausted outside of the housing.

A glazing unit including a glass panel and an antenna unit. The antenna unit includes an antenna, a fixing portion for fixing the antenna to the glass panel at a distance d depending on the frequency so that a space S through which air can flow is formed between the glass panel and the antenna.