Intelligent cabinet with RF shield
An intelligent cabinet ( 1 ) comprises a housing ( 2 ) with an internal cavity ( 2 a ) and a separate compartment ( 2 b ). At least one RFID reader antenna ( 32 ) is arranged within the internal cavity ( 2 a ), and a cooling and/or ventilation arrangement ( 4 ) is arranged in the separate compartment ( 2 b ), outside the internal cavity ( 2 a ). At least one passage ( 5 ) is provided to allow air to circulate between the internal cavity ( 2 a ) and the cooling and/or ventilation arrangement ( 4 ). The internal cavity ( 2 a ) and the compartment ( 2 b ) are separated by an internal wall ( 6 ) within the housing ( 2 ), wherein the passage ( 5 ) comprises a plurality of openings ( 7 a, 7 b ) through the internal wall ( 6 ). The openings are arranged directly in the internal wall ( 6 ) or in a separate part ( 8 a, 8 b ) being connected to the internal wall. Each of the openings ( 7 a, 7 b ) have a maximal extension in the range of 1-20 mm, and preferably 5-15 mm, and at least the surface of the internal wall ( 6 ) and/or the separate part ( 8 a, 8 b ) comprises a conductive material. Hereby, the openings allow a flow of air through the openings, and at the same time provides attenuation or blocking of RF signals.
1 . An intelligent cabinet comprising:
a housing with an internal cavity;
at least one RFID reader antenna-arranged within the internal cavity;
a cooling arrangement, a ventilation arrangement, or both arranged in a compartment of the housing outside said internal cavity; and
at least one passage to allow air to circulate between the internal cavity and the cooling or ventilation arrangement;
wherein the internal cavity and the compartment are separated by an internal wall-within the housing,
wherein the at least one passage comprises a plurality of openings through said internal wall, the openings being arranged directly in the internal wall or in a separate part being connected to the internal wall, each of said openings having a maximal extension in a range of 0.5-20 mm, and
wherein at least the surface of the internal wall, the said separate part, or both comprises a conductive material.
2 . The intelligent cabinet of claim 1 , wherein the compartment-housing the cooling or ventilation arrangement is arranged on top of the internal cavity, whereby the internal wall-forms a ceiling for the internal cavity.
3 . The intelligent cabinet of claim 1 , wherein the openings in total have an area being 20-90% of a cross-sectional area of the passage.
4 . The intelligent cabinet of claim 1 , wherein the plurality of openings is formed directly in the internal wall.
5 . The intelligent cabinet of claim 1 , wherein the plurality of openings is arranged in the separate part connected to the internal wall.
6 . The intelligent cabinet of claim 5 , wherein the separate part is arranged overlying a cut-out in the internal wall.
7 . The intelligent cabinet of claim 1 , wherein the plurality of openings is arranged in a material layer of said internal wall or said separate part having a thickness of 0.2-10 mm.
8 . The intelligent cabinet of claim 1 , wherein the at least one passage-comprises at least two passageways, each passageway comprising a plurality of openings, and wherein each opening comprising a maximal extension in the range of 5-15 mm.
9 . The intelligent cabinet of claim 1 , wherein the plurality of openings is arranged to provide at least 20 dB attenuation at Ultra High Frequency band.
10 . The intelligent cabinet of claim 1 , wherein the plurality of openings is arranged in a solid plate of conductive material.
11 . The intelligent cabinet of claim 1 , wherein the plurality of openings is arranged in a plate of non-conductive material coated with a conductive layer on the surface or a non-conductive material filled with conductive particles.
12 . The intelligent cabinet of claim 1 , wherein the internal cavity is RF shielded.
13 . The intelligent cabinet of claim 1 , wherein the openings are arranged in a grid pattern.
14 . The intelligent cabinet of claim 1 , wherein the openings are formed as cut-out holes in a plate.
15 . The intelligent cabinet of claim 1 , wherein the openings are formed by a metal wire mesh or netting.