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 8.16P
To determine
The beam width for a dipole antenna for the given arbitrary length using MATLAB.
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A helical antenna has a mean diameterof 3m and it operates at 5GHz, if its gainis 30dbi. What is its beam-width?
4. Patch antennas are the antennas of small size and are made of :
a) Strip line
b) Microstrip lines
c) Coaxial cables
d) Rectangular waveguide
5.
of an antenna is a plot of the magnitude of the far field strength versus position around the antenna.
a) Radiation pattern
b) Directivity
c) Beam width
d) None of the mentioned
3- The half wave dipole is widely used in more applications compared to other linear antenna lengths,
that is because
a) It has high gain
d) it has small size
b) its easy matching to coaxial 75 Ohm cable
c) low loss
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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- For a dipole antenna, the radiation resistance is given as 523 ohms. What will be the effective length of the dipole? Express with respect to the wavelength.arrow_forwardA thin dipole antenna having a length of one fifteenth of wavelength has a loss resistance of 2.5 ohm. What will be the antenna efficiency?arrow_forwardFor the given quarter wave dipole antenna, if the radiation resistance is 50 ohms and the loss resistance is 20 ohm, then estimate the radiation efficiency.arrow_forward
- Two infinite decimally small dipole antennas are separated by a distance d=X/2 and are fed with equal currents but opposite in phase. Find the following. i. The angle at which the electric filed E=1/2 ii. The half power beam width (HPBW) iii. First null beam width (FNBW)arrow_forwardA dipole antenna has a radiation resistance of 56 W and a loss resistance of 5 W, measured at the feedpoint. Calculate the efficiency. 91.8 %89.0 %93.0 %88.3 %arrow_forward5. If the gain of a helical antenna is 30dbi and it operates at 5GHz with an average diameter of 3m, what would be its beam-width?arrow_forward
- The radiation resistance of a dipole antenna is 359 ohms and the antenna is operating at a wavelength of 0.05 meters. What will be the effective length of this dipole antenna? Whatarrow_forwardConsider a 90° corner reflector antenna with a half-wave dipole as the driving element and an element to corner spacing of lambda/2. Calculate the directivity:arrow_forwardWhat will be the wavelength of a dipole antenna whose effective length is 8.2 m and radiation resistance is 377 ohms?arrow_forward
- 6. A. A horizontal infinitesimal electric dipole of constant current lo is placed symmetrically about the origin and directed along the x-axis. Derive the far-zone fields radiated by the dipole. ÜNİVERSİTESİ ÜNİVERSİTESİ B. A horizontal infinitesimal electric dipole of constant current 3lo is placed symmetrically about the origin and directed along the y-axis. Derive the directivity of Bİ ÜNİVERSITESİ KATİP ÇELEBİ ÜNİVERSİTESİ the antenna. KATİP ÇELEBİ ÜNİVERSİTESİarrow_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_forward2- Directivity is inversely proportional to...... (A) Beamwidth (B) FNBW (C) Beam area (D) HPBW Z so reflection coefficient is 12 4- What determines antenna polarization? (A) The direction of the electric field vector (B) The direction of the radiated wave (C) The direction of the magnetic field vector (D) The frequency of the radiated wave 5- Antennas convert -to- (A) Electrical into electromagnetic (B) electromagnetic into electrical (C) Both A and B (D) None of the thesearrow_forward
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