Antenna Theory - What is Antenna Aperture & What Are It's Types?
This page contains basic questions and short notes on some of the keywords on antenna theory: Aperture represents the area of the antenna confining the effective radiations. The various types of antenna apertures are: Effective aperture. Scattering aperture. Loss aperture. Collecting aperture. Physical aperture. Effective aperture (A e ): It is the area over which the power is extrated from the incident wave and delivered to the load is called effective aperture. Scattering aperture (A s ): It is the ratio of the re radiated power to the power density of the incident wave. Loss aperture (A l ): It is the area of the antenna which dissipates power as heat. Collecting aperture (A c ): It is the addition of above three apertures. Physical aperture (A p ): This aperture is a measure of the physical size of the antenna. The ratio of the effective aperture to the physical aperture is the aperture efficiency. i.e. Aperture efficiency = η ap = A e / A p ...