Engineering Electromagnetics
9th Edition
ISBN: 9780078028151
Author: Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher: Mcgraw-hill Education,
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Chapter 14, Problem 14.9P
A dipole antenna in free space has a linear current distribution with zero current at each end and with peak current I0 at the center. If the length d is
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A 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?
Chapter 14 Solutions
Engineering Electromagnetics
Ch. 14 - A short dipole-carrying current I0 cos t in the az...Ch. 14 - Prepare a curve, r vs. in polar coordinates,...Ch. 14 - Prob. 14.3PCh. 14 - Write the Hertzian dipole electric field whose...Ch. 14 - Prob. 14.5PCh. 14 - Prob. 14.6PCh. 14 - Prob. 14.7PCh. 14 - Prob. 14.8PCh. 14 - A dipole antenna in free space has a linear...Ch. 14 - Prob. 14.10P
Ch. 14 - A monopole antenna extends vertically over a...Ch. 14 - Find the zeros in for the E-plane pattern of a...Ch. 14 - Prob. 14.13PCh. 14 - For a dipole antenna of overall length 2l=,...Ch. 14 - Prob. 14.15PCh. 14 - Prob. 14.16PCh. 14 - Consider a lossless half-wave dipole in flee...Ch. 14 - Prob. 14.18PCh. 14 - Prob. 14.19PCh. 14 - A two-element dipole array is configured to...Ch. 14 - Prob. 14.21PCh. 14 - Prob. 14.22PCh. 14 - Prob. 14.23PCh. 14 - Prob. 14.24PCh. 14 - Prob. 14.25PCh. 14 - Prob. 14.26PCh. 14 - Consider an n-element broadside linear array....Ch. 14 - A large ground-based transmitter radiates 10 kW...Ch. 14 - Signals are transmitted at a 1-m carrier...Ch. 14 - Prob. 14.30P
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- 2- 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_forwardanswer fastarrow_forward3- 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 lossarrow_forward
- A 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_forward3. With a operational frequency of 30GHz, what is the effective length of a half-wave dipole?arrow_forward6. 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_forward
- Find the radiation efficieney of a six-turn small circular loop at f=300 MHz, the radius of the toop is 0.32, the radius of the wire is 0.00012, and the turns are spaced 0.0003), apart. Assume the wire is copper with a conductivity of 5.7x10 (S/m) and the antenna is radiating into free space. Then discuss how can improve the radiation efficiency further.arrow_forwardI need the answer as soon as possiblearrow_forwardCalculate the length in meter of a half-wave dipole for an operating frequency of 20 MHz assuming a velocity factor of 0.95.arrow_forward
- # 2) A 12-element array of vertical center-fed half-wavelength dipoles is shown below. The dipoles are spaced 2/2 apart except dipoles 4,5 and 8,9 (spaced at 32). If the elements are uniformly fed, write down the expression for the radiation pattern. What is the direction of the main beam? What happens if the distance 3 2 is reduced to λ/2 ? X Z Ø HU WW HU 2/2 + 1 4 31/2 Z Hu 5 8 9 Activate Window Go to Settings to actiarrow_forwardThe 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_forward1. A quarter-wave dipole oriented on z-axis is placed vertically at a height of h = 0.285A above an infinite electric ground plane, a. Write the expression of the electric field, b. Plot the element factor, array factor, and total pattern on yz-plane, c. Redo parts (b) if h = 0, d. Find the input impedance of the dipole if h = 0.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