CONTEXT

Scientists from the IEF laboratory (Institut d’Electronique Fondamentale) and from the IETR (Institut d’Electronique et de Télécommunications de Rennes) have merged their capabilities in electromagnetism and systems for developing a new EBG antenna type.

TECHNICAL DESCRIPTION

More precisely, the patented invention consists of a electromagnetic band gap (EBG) cylindrical material comprising wires arranged in concentric layers (preferably circle) around the radiating element. The wires comprise serial diodes separated by spaces very smaller than the operational wavelength. The diodes allow creating defects (continuous to discontinuous state i.e reflecting state to a transparent state) in the PBG structure, which control the radiating pattern of the global antenna.

The radiating element is arranged in the middle of the BPG Material structure. The distance between the wire layers and between the diodes along the wires are related to the transmission wavelength of the antenna. The arrangement of the radii (curves), the number of the wave-reflecting wires or bars, and of the switched wires, determine the shape of the beam radiated.

BENEFITS

• – Control of the direction and of the shape of the radiation pattern;
  – Possibility of having one or several controlled radio-electric beams;
  – Wide band operating mode (for ex. from 0.9 GHz to 2.1 GHz);
  – Low-cost smart antenna;
  – DC current control.

INDUSTRIAL APPLICATIONS

For application in the telecommunication domain as for:
– In-door and out-door communication networks;
– Application from GSM to WIMAX;
– Radar for aeronautics in military and civil domains;
– Radio link between carriers.