A radio communication tower 35 meter tall is struck by lightning. The antenna is placed at the top of the tower and the electronics at the base of the tower. A cable with solid copper shield connects the electronics with the antenna. It is estimated that about 60% of the lightning current will be flowing through the cable shield. What would be the approximate peak overvoltage appearing at the output port of the electronic circuit (that is voltage between the inner conductor and the shield of the cable at the base of the tower) if the lightning current has a peak amplitude of 50 kA? The shield of the cable has a resistance of 4 mΩ/m and negligible leakage inductance.

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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.