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 14.12P
Find the zeros in
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3. Write down the total electric field E and magnetic field of a dipole antenna
and prove that the near fields do not radiate P
=
-Re(ExH) = 0
R
For a helical antenna, the radiation resistance is 250 ohms and the loss resistance is 50 ohms. Estimate the radiation efficiency of the antenna?
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 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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- Problem 14. Distortions that affect the gain of a parabolic antenna include: a. Surface roughness b. Structure blockage c. Illumination pattern d. All of the above e. None of the abovearrow_forwardDesign a dipole antenna with 1 reflector and 3 director whose frequency is operating from 115MHz to 255 MHz. (Use equations and Special characters in your solutions and answers) Compute for the: 4. Length of Director, L 5. Length of Reflector, LR 6. Spacing from Director to Driven Element, S R-DE 7. Spacing from Driven Element to Director, S DE-D 8. Spacing from Director 1 to Director 2, S D1-D2 9. Spacing from Director 2 to Director 3, S D2-D3 10. Length of Boom, LBarrow_forwardThe most efficient length for a linear antenna is λ/2. Why?arrow_forward
- 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_forward92. The physical length and impedance of a dipole antenna element is a function of frequency. At resonance, what would be the value of the impedance at the ends of its element? A. Immeasurable C. Low B. High D. Undeterminedarrow_forward4. 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 mentionedarrow_forward
- A shirt vertical grounded antenna is designed to radiate at 10 MHz. What will be radiation resistance of the antenna is the effective height of the antenna is 60 m?arrow_forwardQuestion 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_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
- 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_forwardThe radiation resistance of a dipole antenna is 2 ohm. Estimate the length of the dipole antenna in terms of the wavelength.arrow_forward3) What are the applications of log-periodic dipole antenna?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