Abstract:
A radio frequency antenna for radiating electromagnetic energy into a reservoir filled with a target material, the antenna being operatively connected to a feed transmission line. The antenna includes a waveguide, at least one slot formed in the outer waveguide layer, and a sleeve portion enclosing at least a portion of the waveguide. The sleeve portion comprises at least first and second dielectric layers where the permittivity of the second dielectric layer is higher than the permittivity of the first dielectric layer and the first dielectric layer is positioned in closer proximity to the waveguide than the second dielectric layer. When the antenna is inserted into the reservoir, the input impedance of the antenna remains matched to the feed transmission line for a wide range of target materials.
Abstract:
According to various aspects, exemplary embodiments are provided of antenna elements for multi-band antenna assemblies for use with wireless application devices. One exemplary embodiment provides an antenna element for an antenna assembly that is configured to be installed to a wireless application device. In such embodiment, the antenna element generally includes first and second radiating elements. The first radiating element may be tuned to at least one electrical resonant frequency for operating within a bandwidth between about 2400 MHz and about 2500 MHz. The second radiating element may be tuned to at least one electrical resonant frequency for operating within a bandwidth between about 4900 MHz and about 5850 MHz.
Abstract:
An antenna (10) in a radar level gauge for determining the level of the surface (6) of a medium (2) stored in a tank (1). The antenna (10) has a first (11) and a second (13) electrically conductive layer, and between the conductive layers (11, 13) a dielectric layer (12). The second (13) of the conductive layers is provided with a number of holes (14) in a predetermined pattern. Leading to the centre of the dielectric layer (12) is a transmission line (15). The microwaves from a radar unit (3) in the radar level gauge are supplied to the dielectric layer (12) in the antenna (10) via the transmission line (15) and transmitted out in a radial direction from a feed point in the dielectric layer that acts as a waveguide. Via said holes (14) in the second conductive layer (13) a microwave beam radiates out. Due to matching of the phase of the microwave and the placing of the individual holes (14) in the pattern that the holes form, a predominant waveguide mode of the desired order is obtained.
Abstract:
The invention relates to a slot antenna (1) that can be operated in a plurality of frequency ranges. The inventive slot antenna (1) comprises a first electrically conductive disk (10) that is set off from an electrically conductive base (5) that constitutes a reference potential. Said disk is linked with the base (5) via at least one electrically conductive web (20, 21, 22) on its outer rim (15). The first disk (10) is provided with a recess (25). A second electrically conductive disk (30) is disposed above said recess (25) and is linked with the first disk (10) via at least one second electrically conductive web (40, 41, 42) on its outer rim (35). An antenna feed (45) is connected to the second disk (30).
Abstract:
Procédé pour radioélectrifier un objet de mobilier urbain et objet ainsi radioélectrifié - Selon l'invention : • on forme ledit objet (I) avec au moins un poteau (2) en une matière conductrice de l'électricité, ce poteau étant au moins partiellement creux et au moins approximativement vertical; et • on agence dans ledit poteau (2) au moins deux parties superposées (2I, 2S), électriquement isolées l'une de l'autre pour former une antenne à rayonnement horizontalement omnidirectionnel.
Abstract:
Antennas that can transceive signals in a horizontally-polarized, omni-directional manner are described. In an example embodiment, an antenna comprises a spiraling surface having a spiral cross-section, the surface forming an internal cavity, an internal channel to the external surface, and an internal wall common to the cavity and the channel. Further, an example embodiment comprises a longitudinal opening allowing access to the cavity and the channel by a transmission feed line. Alternate embodiments comprise various cross-sectional configurations, and may also comprise a radome at least partially surrounding the antenna spiraling surface and supporting structure.
Abstract:
Recovery of hydrocarbons, such as petroleum products, from a liquid or solid substrate is facilitated by the use of microwave energy (18) to energize and separate molecular bonds between the hydrocarbons and the substrate. A radio frequency (RF) applicator (18) delivers microwave energy to a treatment volume (12) containing an emulsion (22) of a hydrocarbon and a substrate. Delivering the microwave energy to the emulsion (22) facilitates separation of the hydrocarbon and substrate molecules into layers. Hydrocarbons and other products can then be recovered from their respective layers. The treatment volume may be located either above or below ground. The RF applicator (18) may include an antenna body (54) with slots (60) formed substantially parallel to one another in a substantially horizontal orientation.
Abstract:
Recovery of hydrocarbons, such as petroleum products, from a liquid or solid substrate is facilitated by the use of microwave energy to energize and separate molecular bonds between the hydrocarbons and the substrate. A radio frequency (RF) applicator delivers microwave energy to a treatment volume containing an emulsion of a hydrocarbon and a substrate. Delivering the microwave energy to the emulsion facilitates separation of the hydrocarbon and substrate molecules into layers. Hydrocarbons and other products can then be recovered from their respective layers. The treatment volume may be located either above or below ground. The RF applicator may include an antenna body with slots formed substantially parallel to one another in a substantially horizontal orientation. The RF applicator efficiently delivers microwave energy into the treatment volume. Substantially all of the power supplied to the RF applicator is radiated, with very little power reflected internally within the RF applicator.
Abstract:
A wireless communication device and method for identifying a container or communication information about a container using a slot in the container as an antenna. The device includes a wireless communication device for transmitting information regarding the container. The container includes an outer wall forming rim and a slot between the rim edge and the outer wall that is cirular and continues without boundaries. The wireless communication device is coupled to the slot to provide the slot antenna for communications. An impedance matching network is additionally provided to make the operating frequency of the slot the same as the operating frequeny of the wireless communication device. Alternatively, shorting posts may be placed in the slot to define boundaries of the slot to match the operating frequency of the slot to the operating frequency of the antenna.