An antenna has a radiation resistance of 80 ohms, effective (ohmic) resistance of 10 ohms, directive gain of 30, and input power of 50 watts. Determine the following: Antenna Efficiency Antenna Power Gain in ratio and in dB Radiated Power in W, dBm and dBW.

An antenna has a radiation resistance of 80 ohms, effective (ohmic) resistance of 10 ohms, directive gain of 30, and input power of 50 watts. Determine the following: Antenna Efficiency Antenna Power Gain in ratio and in dB Radiated Power in W, dBm and dBW.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

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.

Question

An antenna has a radiation resistance of 80 ohms, effective (ohmic)
resistance of 10 ohms, directive gain of 30, and input power of 50
watts. Determine the following:
Antenna Efficiency
Antenna Power Gain in ratio and in dB
Radiated Power in W, dBm and dBW.
EIRP in W, dBm and dBW.
Power density 3 km away from the antenna in the direction of maximum radiation
Antenna Current

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