FLAT INDUCTIVE ANTENNA Russian patent published in 2012 - IPC H01Q9/00 

FIELD: physics, radio.

SUBSTANCE: invention relates to inductive coupled systems and can be used as a transmitting antenna in inductive systems for local wireless communication and control, a transceiving antenna in portable or mobile systems, radio frequency identification with inductive interaction, particularly in portable inductive systems for counteracting unauthorised information accessing. The inductive antenna has an inductor, a feed line for connecting a high-frequency vibrator to the inductor and a variable capacitor for resonance tuning of the antenna. The inductor is in form of a multi-turn arithmetic coil whose turns are made from a strip conductor lying on a dielectric base, wherein the width of the gaps between the turns is the same and is equal to the width of the strip conductor of the coil. In the middle of the spiral conductor at a distance of λ/8 from its beginning, a cut is made with formation of a gap and a double-helical arithmetic coil whose conductors are bent in opposite sides from the gap. Variable capacitors are connected in series to each branch of the coil and serve to perform resonance tuning of the antenna.

EFFECT: longer range of the inductive communication system.

3 cl, 3 dwg