NOVELTY - An electrically conductive system comprises: a substrate and an electrically conductive track adhered to the substrate, where the substrate comprises a semi-aromatic polyamide and the electrically conductive track is obtained by jet printing.    USE - As an electrically conductive system useful in antenna, which is used in a mobile device; in the manufacture of electrical circuits or contacts in solar cells, transistors, organic light emitting diodes (OLED), flexible printed circuits (FPC) and radio frequency identification (RFID) systems (claimed).    ADVANTAGE - The electrically conductive system comprising the semi-aromatic polyamide substrate results in a good level of adhesion between the substrate and the conductive track as determined by the cross hatching test according to ASTM D3359-08 D, test method B. The semi-aromatic polyamide substrate provides good adhesion since other high performance polymers such as liquid crystal polymer and liquid crystal polymer (LCP) fail in the adhesion test. The semi-aromatic polymer is able to withstand the relatively high sintering temperatures of above 200 degrees C, and even after exposure to high humidity and high temperature conditions for a prolonged period of time, the adhesion remains high. This makes the electrically conductive system particularly suitable for applications in electronic equipment, such as antennae for mobile devices. The advantage of the electrically conductive system that is prepared with a jet printing process is that the height of the conductive track can be lower than with an electrically conductive system that is applied via laser direct structuring (LDS)-process. The lower height of the tracks means that less precious metal or metal alloy is needed in the preparation, therefore the costs of the total electrically conductive system is reduced compared to prior art systems.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) production (P1) of electrically conductive system comprising substrate and conductive track adhered to the substrate, involving: applying conductive track precursor on substrate comprising semi-aromatic polyamide, by jet printing technique; sintering the conductive track precursor on the substrate at a temperature of at least 150 degrees C to obtain conductive track on the substrate; and    (2) electrically conductive system obtained by the process (P1).