Antenna ArrayAn antenna array is a configuration of multiple antennas. Most antenna arrays consist of identical antennas. The antennas of an array (array elements) are positioned in a particular geometry in order to achieve specific radiation characteristics for the overall array pattern.
Antenna array is a common method of combining the radiations from a group or array of antennas.
Antenna array may take various forms, such as:
- Linear Array: Here, array elements lie along a straight line.
- Planar Array: Here, array elements are spread over a planar surface.
- Conformal Array: In this, array elements conform to some nonplanar surface (such as an aircraft fuselage).
- Phased Array: In this, the main beam of the stationary array can be steered electronically by changing the phases of the individual array elements.
Concept of Grating Lobes
A grating lobe is defined as a lobe, other than the main lobe, produced by an array antenna when the inter-element spacing is sufficiently large to permit the in-phase addition of radiated fields in more than one direction.