2.7. The power radiated by a lossless antenna is 10 watts. The directional charac- teristics of the antenna are represented by the radiation intensity of (watts/unit solid angle) (0<0 <1/2,0 < ¢ < 27) (a) U = B, cos² 0 (b) U = B, cos³ e| For each, find the (a) maximum power density (in watts/square meter) at a distance of 1,000 m (assume far-field distance). Specify the angle where this occurs. (b) exact and approximate beam solid angle 24. (c) directivity, exact and approximate, of the antenna (dimensionless and in dB).

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Antenna Characteristics

The antenna is an important concept in the domain of electronics and communication engineering. An antenna forms an integral part of many commonly used devices such as wireless modems, routers, game controllers, mobile phones, bluetooth devices, and so on. In simple terms, any wireless communication makes use of antennas to serve the purpose. An antenna, also known by the term 'arial', is an electrical device that converts electrical signals into electromagnetic waves or electromagnetic waves into electrical signals. An antenna contains a transmission line usually made up of co-axial cable, it then receives the signals and converts them into electromagnetic waves, which are then transmitted via space into their required destination. A communication system essentially makes use of two antennas, a transmission antenna, which converts electrical signals into electromagnetic waves, and a receiving antenna, which receives the electromagnetic waves and converts them back into electrical signals.