Abstract: A radar level gauge system comprising: a transceiver; an antenna assembly for arrangement at an opening in a tank wall for radiating a transmit signal vertically towards the product in the tank, and to return a reflection signal resulting from reflection of the transmit signal at a surface of the product; and processing circuitry for determining the filling level based on the transmit signal and the reflection signal. The antenna assembly comprises: a non-plastic dielectric antenna body having a convex surface facing away from an interior of the tank and a planar surface facing the interior of the tank, when the antenna assembly is arranged at the opening in the tank wall; and a feed arranged to direct the transmit signal towards the convex surface of the non-plastic dielectric antenna body.

Abstract: A microwave transmission arrangement, comprising an electrically conductive hollow waveguide having a first waveguide portion, a second waveguide portion between the first waveguide portion and a first end of the hollow waveguide, and a conductive transition surface of the hollow waveguide forming a transition between the first waveguide portion and the second waveguide portion; and a microwave circuit board including a dielectric carrier, and a first conductor pattern on a first side of the dielectric carrier, the first conductor pattern including a patch for radiating or receiving microwave signals in the predefined wavelength range, and a first ground plane surrounding the patch, wherein the first ground plane of the microwave circuit board is in conductive contact with the first end of the hollow waveguide, and extends into the second waveguide portion cross-section area to define at least one conductive pocket together with the second waveguide portion and the transition surface of the hollow waveguide.

Abstract: A microwave transmission arrangement, comprising a microwave circuit board including a patch; microwave transceiver circuitry coupled to the patch; an electrically conductive hollow waveguide arranged to guide microwave signals between a first end and a second end; and a separator sheet sandwiched between the microwave circuit board and the first end of the hollow waveguide, the separator sheet being configured to allow passage of microwaves between the patch and the hollow waveguide through the separator sheet. The separator sheet is included in an encapsulation separating an encapsulated interior of the microwave transmission arrangement from an exterior outside the encapsulation, the patch, and the microwave transceiver circuitry being in the encapsulated interior, and the hollow waveguide being in the exterior outside the encapsulation.

Abstract: A waveguide for connecting measurement circuitry to an antenna in a radar level gauge, the waveguide comprising: a first tubular waveguide section having a female connecting portion, the first tubular waveguide section having a first abutment surface on an outer surface; a second tubular waveguide section having a male connecting portion arranged within the female connection portion so that the first and second waveguide portions are movable relative each other in an axial direction and to provide a continuous tubular passage through the waveguide, the second tubular waveguide section having a second abutment surface; and a spring arranged to abut against the first abutment surface and the second abutment surface.

Abstract: A microwave transmission arrangement, comprising an electrically conductive hollow waveguide having a first waveguide portion, a second waveguide portion between the first waveguide portion and a first end of the hollow waveguide, and a conductive transition surface of the hollow waveguide forming a transition between the first waveguide portion and the second waveguide portion; and a microwave circuit board including a dielectric carrier, and a first conductor pattern on a first side of the dielectric carrier, the first conductor pattern including a patch for radiating or receiving microwave signals in the predefined wavelength range, and a first ground plane surrounding the patch, wherein the first ground plane of the microwave circuit board is in conductive contact with the first end of the hollow waveguide, and extends into the second waveguide portion cross-section area to define at least one conductive pocket together with the second waveguide portion and the transition surface of the hollow waveguide.

Abstract: A radar level gauge system, comprising a transceiver; an antenna for radiating an electromagnetic transmit signal from the transceiver towards a surface of the product and for returning an electromagnetic reflection signal back towards the transceiver; a feed-through connecting the transceiver and the antenna; and processing circuitry coupled to the transceiver for determining the filling level based on a relation between the transmit signal and the reflection signal, wherein the feed-through comprises a waveguide arranged between the transceiver and the antenna to receive the transmit signal from the transceiver and guide the transmit signal towards the antenna in a guiding direction, the waveguide comprising an elongated plug arranged in a hollow conductor extending in the guiding direction, wherein the plug comprises a non-conductive sleeve member and a metallic plug member, the non-conductive sleeve member being sealingly joined to a portion of the hollow conductor and to the metallic plug member.

Abstract: A radar level gauge system, comprising a transceiver; an antenna arrangement configured to transmit an electromagnetic transmit signal from the transceiver, and to return an electromagnetic reflection signal resulting from reflection of the transmit signal at a surface of the product back towards the transceiver; and processing circuitry. The antenna arrangement comprises: a dielectric antenna body having a transmit signal receiving surface to receive the transmit signal from the transceiver, a convex transmit signal emitting surface configured to direct the transmit signal towards the product following passage of the transmit signal through the dielectric antenna body, and a side surface connecting the transmit signal receiving surface and the transmit signal emitting surface; and an electrically conductive antenna housing covering at least a portion of the side surface of the dielectric antenna body.

Abstract: A radar level gauge including a wave guiding structure and a cavity formed inside the wave guiding structure, and a dielectric filling member arranged at least partly within said cavity. The dielectric filling member includes a main body formed of a polymer material, at least one microwave absorbing element formed of a modified polymer material providing a microwave attenuation of at least 1 dB/centimeter at an operating frequency of the radar level gauge, the modified polymer material being obtained by modifying said polymer material with a filler material, wherein the at least one microwave absorbing element is integrally formed with said main body by sintering.

Abstract: A radar level gauge system, comprising a transceiver; an antenna for radiating an electromagnetic transmit signal from the transceiver towards a surface of the product and for returning an electromagnetic reflection signal back towards the transceiver; a feed-through connecting the transceiver and the antenna; and processing circuitry coupled to the transceiver for determining the filling level based on a relation between the transmit signal and the reflection signal, wherein the feed-through comprises a waveguide arranged between the transceiver and the antenna to receive the transmit signal from the transceiver and guide the transmit signal towards the antenna in a guiding direction, the waveguide comprising an elongated plug arranged in a hollow conductor extending in the guiding direction, wherein the plug comprises a non-conductive sleeve member and a metallic plug member, the non-conductive sleeve member being sealingly joined to a portion of the hollow conductor and to the metallic plug member.

Abstract: A radar level gauge system, comprising a transceiver; an antenna arrangement configured to transmit an electromagnetic transmit signal from the transceiver, and to return an electromagnetic reflection signal resulting from reflection of the transmit signal at a surface of the product back towards the transceiver; and processing circuitry. The antenna arrangement comprises: a dielectric antenna body having a transmit signal receiving surface to receive the transmit signal from the transceiver, a convex transmit signal emitting surface configured to direct the transmit signal towards the product following passage of the transmit signal through the dielectric antenna body, and a side surface connecting the transmit signal receiving surface and the transmit signal emitting surface; and an electrically conductive antenna housing covering at least a portion of the side surface of the dielectric antenna body.

Abstract: A radar level gauge including a wave guiding structure and a cavity formed inside the wave guiding structure, and a dielectric filling member arranged at least partly within said cavity. The dielectric filling member includes a main body formed of a polymer material, at least one microwave absorbing element formed of a modified polymer material providing a microwave attenuation of at least 1 dB/centimeter at an operating frequency of the radar level gauge, the modified polymer material being obtained by modifying said polymer material with a filler material, wherein the at least one microwave absorbing element is integrally formed with said main body by sintering.

Abstract: A radar level gauge system, comprising a transceiver; an antenna; a feed-through connecting the transceiver and the antenna; and processing circuitry coupled to the transceiver.

Abstract: A radar level gauge system, comprising a transceiver; an antenna; a feed-through connecting the transceiver and the antenna; and processing circuitry coupled to the transceiver.

Abstract: A reflective target plate for mounting on a floating roof of a tank for ensuring satisfactory reflection of radar signals emitted from a radar level gauge towards the floating roof. The plate comprises a plurality of elongated grooves, each formed by two flat, radar reflective surfaces facing each other, normals of the surfaces being perpendicular to each other. A first set of elongated grooves has grooves extending with their longitudinal axis in a first direction, and a second set of elongated grooves has grooves extending with their longitudinal axis in a second direction, the first and second directions being perpendicular to each other. The target plate will sufficiently reflect circularly polarized radar and linearly polarized radar will be equally reflected regardless of the rotation of the plate. This will facilitate installation, as the orientation of the plate becomes less critical.

Abstract: A radar level gauge using comprising a transceiver, processing circuitry, a signal propagating device, and a wave guide arrangement connecting the transceiver with the signal propagation device. The wave guide arrangement includes a hollow wave guide, a first filling member made of a first dielectric material, which first filling member is arranged inside the hollow wave guide, and a second filling member made of a second dielectric material, which second filling member is arranged inside the hollow wave guide outside the first filling member with respect to the tank. The second filling member is fixed in the wave guide at least in a direction out from the tank, and is configured to withstand temperatures up to 250 degrees Celsius. During conditions of temperatures sufficiently high to soften the inner filling member, the outer filling member will thus serve to prevent the first filling member from being forced out of the wave guide.

Abstract: A radar level gauge using comprising a transceiver, processing circuitry, a signal propagating device, and a wave guide arrangement connecting the transceiver with the signal propagation device. The wave guide arrangement includes a hollow wave guide, a first filling member made of a first dielectric material, which first filling member is arranged inside the hollow wave guide, and a second filling member made of a second dielectric material, which second filling member is arranged inside the hollow wave guide outside the first filling member with respect to the tank. The second filling member is fixed in the wave guide at least in a direction out from the tank, and is configured to withstand temperatures up to 250 degrees Celsius. During conditions of temperatures sufficiently high to soften the inner filling member, the outer filling member will thus serve to prevent the first filling member from being forced out of the wave guide.

Abstract: A radar level gauge system comprising a transceiver for generating, transmitting and receiving electromagnetic signals; an antenna arranged to direct transmitted electromagnetic signals towards a surface of the product contained in the tank, and to return reflected electromagnetic signals resulting from reflections at impedance transitions encountered by the transmitted electromagnetic signals back to the transceiver; and a hollow waveguide connecting the transceiver and the antenna for guiding the electromagnetic signals therebetween. The radar level gauge system further comprises a leak indication member being movably arranged inside the hollow waveguide in such a way that a force resulting from leakage of the fluid at the sealing member causes a movement of the leak indication member which causes a change in at least one microwave propagation characteristic of the hollow waveguide.

Abstract: A radar level gauge system, for determining a filling level of a product contained in a tank, comprising a transceiver for generating, transmitting and receiving electromagnetic signals; an antenna arranged to direct transmitted electromagnetic signals towards a surface of the product contained in the tank, and to return reflected electromagnetic signals resulting from reflections at impedance transitions encountered by the transmitted electromagnetic signals back to the transceiver; and a hollow waveguide connecting the transceiver and the antenna for guiding the electromagnetic signals therebetween. A sealing member is arranged to seal the waveguide to prevent fluid from passing into the waveguide from an interior of the tank; and the radar level gauge system further comprises processing circuitry connected to the transceiver and configured to determine the filling level based on the reflected electromagnetic signals.

Abstract: A radar level gauge system (1) having an antenna arrangement (3) adapted to emit microwaves towards a surface (7) of the product (6) and to receive microwaves reflected from the surface (7) The antenna arrangement (3) includes a reflector (8) and a multi band patch antenna array (9) arranged at a distance from the reflector (8) and adapted to emit electromagnetic waves to be reflected by the reflector towards the surface (6). The array (9) has first and second groups of radiator elements (19) adapted to emit electromagnetic radiation with first and second radiation footprints (14, 15), wherein the second radiation footprint (15) is substantially equal to the first radiation footprint (14), and wherein the reflector (8) has a size corresponding to the first and second radiation footprints (14, 15). According to the present invention, the reflector will be adapted to receive most of the radiation in the first and second radiation footprints.

Abstract: The present invention relates to a radar level measuring device for non-contact measurement of a level of a product in a container. The device comprises a flange which is mounted on the container in such a way that a lead-through of the flange at least partly covers an opening in the container. The device further comprises a waveguide part, insertable into the flange. When inserted, the insertable waveguide part is arranged to come to a stop at a distance (D) from the surface of the flange intended to face the container, along which distance (D), a waveguide is formed, forming a continuous waveguide together with the insertable waveguide part when inserted.