The antenna with slits is characterized by its vertical or horizontal development in form of angle, or Guide of wave S, with slits on dimensions and site private individuals which are functions of the frequency.

Principle

The wave is emitted directly by the slits of the guide of wave and form an owner of Interférence S according to the principle of the Fentes of Young with a fort profit in the direction perpendicular to its length, if the spacing of the openings is a multiple wavelength used. A directional antenna is thus obtained whose owner of emission is less precise than a parabolic aerial but far from expensive and robust.

Telecommunications

The antenna with slits is used to produce sectoral antennas of Télécommunication, i.e. having a significant profit on a rather large aperture. Three, even four, antennas with slits joined together with a ADF sense antenna coupler make it possible to cover a zone 360°. These antennas are used in particular for the Wi-Fi, the Radioamateurisme.

Radar

Another use is for radars Micro-onde of maritime surveyance and airport. An antenna with slits of the type which one sees in the image in top on the right does not have reflectors but generates a beam of which one can increase the resolution by using a lens with microwave. Such an antenna placed horiontalement will locate ships on sea or of the vehicles on ground but it however does not have any resolution in the vertical and cannot thus be useful for a sweeping in three dimensions. One thus makes them horizontally swivel on a mast in order to probe on 360 degrees.

These antennas advantageously replace the made antennas of sections of Parabole S which were used before. They are much less expensive than complete parabolic aerials, with horn of emission to the hearth.

Trains

One also uses this type of antennas on certain suburban trains to determine the precise position of the coaches compared to the quay in order to position the doors at the good place at the time of the stop.

See too

Article related

• parabolic Aerial
• Antenna network with ordering of phase

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