Device with a built in antenna

A LED lighting device comprising:

• a housing having an internal surface, said housing having a cup shape with a bottom end, a top end including a light output face, and a waist between the bottom end and the top end;
• a circuit board within the housing;
• an RF (radio frequency) circuit mounted on the circuit board;
• an antenna structure formed on the housing;
• a positioning member formed on the internal surface of the housing and at the waist of the cup shape, and adapted to engage and position the circuit board;
• a first RF coupling portion formed on the positioning member, and electrically connected to the antenna structure;
• and
• a second RF coupling portion formed on the circuit board and electrically connected to the RF circuit,
• wherein, when the circuit board is engaged and positioned by the positioning member, the second RF coupling portion is aligned with, and RF coupled to, the first RF coupling portion so as to provide a RF coupling between the antenna structure and the RF circuit, characterized in that said first RF coupling portion is adapted to provide the RF coupling as the feed of the antenna structure.