Abstract: Apparatus comprising a first layer of electrically conductive material and a second layer of electrically conductive material, and a plurality of impedance elements connecting said first layer with said second layer, wherein an impedance value of at least some of said plurality of impedance elements is controllable.

Abstract: Apparatus comprising a first layer of electrically conductive material and a second layer of electrically conductive material, and a plurality of impedance elements connecting said first layer with said second layer, wherein an impedance value of at least some of said plurality of impedance elements is controllable.

Abstract: The invention relates to user equipment and a method for communication. The user equipment comprises a processing unit, a memory unit and a communication interface for communication with an access point controlled by the processing unit. The communication interface is configured to use an identifier stored in the memory unit. Any communication sent by the communication interface to the access point is associated with the identifier. The memory unit comprises a category-to-identifier database in which virtual identifiers are stored, each associated with a specific content category. The communication interface is configured to determine which specific content category a determined data to be sent to the access point belongs to, to obtain from the category-to-identifier database the virtual identifier corresponding to the specific content category which the determined data belongs to, and to allocate to the determined data the virtual identifier as identifier to be used for transmission to the access point.