The concept of antenna aperture is easy to explain if you look at a horn antenna, though it applies to all antennas including a dipole antenna which has no physical 'aperture'. In the figure shown here, the area marked with pink dotted line corresponds to the physical aperture of the horn antenna, where the incident electromagnetic wave strikes in case of a receiving antenna. But the effective area will be the total power received by the antenna divided by the power density of the incident wave. The effective area of the antenna may be less than the physical area of the aperture of the horn. In case of other types of antennas which do not appear to have a physical aperture like, the wire antenna, the effective aperture of the antenna can be found using the same method. Read More: johnsonfrancis...
14 окт 2024
