Proximity sensor and antenna

A capacitive proximity sensor for detecting the presence of a conductive or dielectric body in a detection region adjacent to a portable device, the sensor comprising a stacked structure having on a first layer a first electrode facing the detection region and, on a second layer an internal electrode, wherein the first electrode has a plurality of openings that allow a partial capacitive coupling between the internal electrode and conductive and/or dielectric bodies in the detection region, such that the first electrode screens partially the internal electrode, the capacitive proximity sensor comprising one or more than one capacitance reading units configured to determine a capacitance of one electrode and a shield control unit configured to generate a shield potential following that of an electrode whose capacitance is measured by a capacitance reading unit, the capacitive proximity sensor comprising a readout circuit configured to determine a first capacitance of either the first electrode or the internal electrode by applying the shield potential to the other electrode and a second capacitance of either the first electrode or the internal electrode while keeping the other electrode at a fixed potential, and to determine a permittivity of a body in the detection region based on said first capacitance and second capacitance, the capacitive proximity sensor comprising a data transmission interface for the communication with a host system, the data transmission interface being configured to transmit a permittivity value encoding the permittivity of the body in the detection region as a binary variable.