Fundamentals of Electromagnetics with Engineering Applications
1st Edition
ISBN: 9780470105757
Author: Stuart M. Wentworth
Publisher: Wiley, John & Sons, Incorporated
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Chapter 8, Problem 8.14P
To determine
The radiation resistance of the antenna.
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Lesson: Antenna Theory
Calculate the maximum directivity of an antenna with a radiation
intensity ?=?∙sin?.
2- Find directivity of an isotropic antenna
3- Find directivity of an infinitesimal dipole
Chapter 8 Solutions
Fundamentals of Electromagnetics with Engineering Applications
Ch. 8 - Prob. 8.1PCh. 8 - What is the pattern solid angle and the...Ch. 8 - Sketch an appropriate cross section of the...Ch. 8 - Prob. 8.5PCh. 8 - Prob. 8.6PCh. 8 - Prob. 8.7PCh. 8 - Prob. 8.8PCh. 8 - Prob. 8.9PCh. 8 - Prob. 8.10PCh. 8 - Prob. 8.11P
Ch. 8 - Prob. 8.12PCh. 8 - Suppose in the far field for an antenna at the...Ch. 8 - Prob. 8.14PCh. 8 - Prob. 8.15PCh. 8 - Prob. 8.16PCh. 8 - How long is a 1.5 -long dipole antenna at 1.0 GHz?...Ch. 8 - Prob. 8.18PCh. 8 - Prob. 8.19PCh. 8 - Prob. 8.20PCh. 8 - Prob. 8.21PCh. 8 - Prob. 8.22PCh. 8 - Prob. 8.23PCh. 8 - Prob. 8.24PCh. 8 - Prob. 8.25PCh. 8 - Prob. 8.27PCh. 8 - Prob. 8.28PCh. 8 - Prob. 8.29PCh. 8 - Prob. 8.30PCh. 8 - Prob. 8.31PCh. 8 - How long is a 0.75 monopole antenna at 1.0 GHz?...Ch. 8 - Prob. 8.33PCh. 8 - Prob. 8.34PCh. 8 - Prob. 8.35PCh. 8 - Prob. 8.36PCh. 8 - Prob. 8.37PCh. 8 - Prob. 8.38PCh. 8 - Two small loop antennas, each oriented in the xy...Ch. 8 - Prob. 8.40PCh. 8 - Prob. 8.41PCh. 8 - Prob. 8.42PCh. 8 - A particular broadside antenna array consists of...Ch. 8 - Prob. 8.44PCh. 8 - Prob. 8.45PCh. 8 - Prob. 8.46PCh. 8 - Prob. 8.47PCh. 8 - Prob. 8.48PCh. 8 - Design an open-ended shunt-stub matching network...Ch. 8 - Prob. 8.50PCh. 8 - Prob. 8.51PCh. 8 - Prob. 8.52PCh. 8 - Prob. 8.53PCh. 8 - Prob. 8.54PCh. 8 - Prob. 8.55P
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- An isotropic antenna is radiating evenly in the r–direction in free space. The totalelectric field (E0) is 20 V/m at 1-m distance. Determine the following parameters at adistance of 139 m from the antenna. (iii)Find The total radiated power.arrow_forwardA transmitting dipole antenna has an effective height of 61.4 m and the wavelength of radiation is 625 m. What will be the value of the radiation resistance of the antenna?arrow_forwardA half-wave dipole, which has a total length of L = 1.39 cm (i) Analyze the resonant frequency fr. (ii) Determine the new fr when the dipole length is 3L. (iii) Determine the radiation resistance of a quarter-wave monopole that hasa total length of L.arrow_forward
- An isotropic transmitting antenna is transmitting 10 W of power. If the receiving antenna is located at 100 m away and the receiving antenna is also isotropic, then what will be the power received by the receiving antenna? Assume the transmitting antenna is transmitting at a frequency of 300 MHz.arrow_forward11. A 3cm long center-fed dipole is used as an antenna at 100MHz. The antenna wire ismade of copper and has a radius α = 0.2mm. Find the radiation resistance and radiationefficiency of the dipole antenna.arrow_forwardA electric dipole consists of charges of magnitude 1048 nC separated by 6.23 µ?. It is in electric field of 1100 N/C. (a). Calculate the magnitude of dipole momenarrow_forward
- If a parabolic antenna is equipped with a 10 m diameter dish, then what will be the first null beamwidth of the antenna is the wavelength of radiation is 0.005 m?arrow_forwardA uniform electric field of 300 N/C makes an angle of 25∘ with the dipole moment of an electric dipole. If the torque exerted by the field has a magnitude of 2.5×10−7 , the dipole moment must be:arrow_forwardAn antenna has a loss resistance of 32 ohms, power gain of 30 and directivity equal to 42. What will be the radiation resistance of the antenna?arrow_forward
- If a half wave dipole antenna has a peak antenna current of 10 A, then estimate the power radiated by the antenna.arrow_forwardA 1-m long dipole antenna is driven by a 150 MHz source having a source resistance of 50 ohms and a voltage of 100 V. If the ohmic resistance of the antennas is given by RL = 0.625 ohms, find the:(a) Current going into the antenna (Iant)(b) Power dissipated by the antenna(c) Power radiated by the antenna(d) Radiation efficiency of the antennaarrow_forwardIf the diameter of a parabolic reflector antenna is 1.3 m, then what will be the half power beamwidth of the antenna? Assume the wavelength of radiation to be 0.2 m.arrow_forward
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How does an Antenna work? | ICT #4; Author: Lesics;https://www.youtube.com/watch?v=ZaXm6wau-jc;License: Standard Youtube License