What is a Grid Antenna?

A Grid Antenna is a variation of the parabolic/dish antenna. The problem with a dish antenna is that under heavy/moderate wind conditions it moves out of alignment or deforms. This is because it has a large solid surface which is usually perpendicular to the wind flow. Since the reflector of the grid antenna is perforated into a grid, it does not face any issues under heavy wind conditions, as the wind easily passes through the grill.

Grid Antennas consist of a reflector made up of a grill of parallel wires or bars oriented in one direction acting as a polarizing filter as well as a reflector. It only reflects linearly polarized radio waves, with an electric field parallel to the grill elements. The spacing of the grid elements is frequency dependent; it is inversely proportional to the frequency.

The gain and beam width of grid antennas are similar to parabolic antennas. They can be used as high-gain antennas for point-to-point communications, in applications such as microwave relay links that carry telephone and television signals between nearby cities, wireless WAN/LAN links for data communications, satellite communications and spacecraft communication antennas.

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