An electric field strength of 10 µV/m is to be measured at an observation point = π/2. 500 km from a half-wave (resonant) dipole antenna operating in air at 50 MHz. (a) What is the length of the dipole? (b) Calculate the current that must be fed to the antenna. (c) Find the average power radiated by the antenna. (d) If a transmission line with Zo = 75 is connected to the antenna, determine the stand- ing wave ratio.

An electric field strength of 10 µV/m is to be measured at an observation point = π/2. 500 km from a half-wave (resonant) dipole antenna operating in air at 50 MHz. (a) What is the length of the dipole? (b) Calculate the current that must be fed to the antenna. (c) Find the average power radiated by the antenna. (d) If a transmission line with Zo = 75 is connected to the antenna, determine the stand- ing wave ratio.

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 electric field strength of 10 µV/m is to be measured at an observation point
500 km from a half-wave (resonant) dipole antenna operating in air at 50 MHz.
π/2,
(a) What is the length of the dipole?
(b) Calculate the current that must be fed to the antenna.
(c) Find the average power radiated by the antenna.
(d) If a transmission line with Zo = 75 is connected to the antenna, determine the stand-
ing wave ratio.

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Step 2: Determining the length of the half dipole:

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Step 3: Determining current that must be fed to the antenna:

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Step 4: Determining the average power radiated:

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Step 5: Determining the standing wave ratio:

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