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 14.30P
To determine
(a)
The maximum directivity of the given antenna.
To determine
(b)
The current amplitude
To determine
(c)
Values of
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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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- The radiation resistance of a dipole antenna is 355 ohm. What will be the efective length of the antenna in terms of the wavelength?arrow_forward23: (a) What does mean by directivity of antenna? Explain For an antenna, derive an expression for effective aperture in term of the gain. An FM broadcast radio station has an antenna with directivity of 2.5 dB and efficiency of 76%. The transmitted power is 100 kW. Calculate the effective isotropic radiated power. c) With aid of equations, explain how the motion of charges and curved or bent wire are the source of radiation in antenna theory.arrow_forwardb) A particular antenna has a VSWR of 2.4. Determine the following and, in each case, show full working: i) Reflection coefficient. Please transpose the equation for VSWR and show your working. ii) Calculate the mismatch efficiency of the antenna. Show your working.arrow_forward
- Question A half-wave dipole antenna has Rioss = 1Q. What is the antenna gain? O 1.48 O 4.18 dB 1.62 O Not enough information to answerarrow_forwardQ1) Very low signal strength in antenna. * Antenna patterns O Major lobes O Minor lobes O Nullarrow_forwardQuestion 3 (a) A television receiver's folded dipole antenna has an impedance of 600 0. If a RG-6 coaxial (75 0) coaxial cable is used, calculate the ratio required to match the cable and the antenna. (b) Figure Q3. (b) shows a beam antenna consisting of a dipole, a reflector, and a director. Design the beam antenna given that it is cut for a frequency of 200 MHz and assuming a velocity coefficient of 0.85. The length of the reflector is 5% more than the length of the dipole and the length of the director is 5% less than the length of the dipole. 0.15 Figure Q3(b)arrow_forward
- 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 lossarrow_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_forward101 V/ An omnidirectional antenna (isotropic) has a field pattern given by E = where I is terminal current in ampere and r is distance in metres. Calculate the radiation esistance.arrow_forward
- What is meant by the resolution of an antenna? Also, explain what is meant by transverse elastic wave?arrow_forwardIf the diameter of a parabolic reflector antenna is 1.5 m, then what will be the half power beamwidth of the antenna? Assume the wavelength of radiation to be 0.5 m.arrow_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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How does an Antenna work? | ICT #4; Author: Lesics;https://www.youtube.com/watch?v=ZaXm6wau-jc;License: Standard Youtube License