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 14.16P
To determine
(a)
The locations in
To determine
(b)
The side lobe level.
To determine
(c)
The maximum directivity
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b) 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.
The directivity of the infinitesimal (ideal dipole) is equal to the directivity
* of short dipole, that is because
they have the same length
They have the same gain
they have the same normalized field
they have the same electric field
Design 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, LB
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
- 92. 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_forward4. If the diameter of isotropic antenna is 5cm and wavelength is 10 cm, then the far-field region is; A. 10 cm B.5 cm C.5m D. 10 m 5. The axial ratio of helix antenna is 1.1. what is the number of turn at twice the axial ratio? A. increases B. Decreases C. not affected C. equallyarrow_forward
- A 100-turn loop antenna of radius 20 cm operating at 10 MHz in air is to give a 50 mV/m field strength at a distance 3 m from the loop. Determine (a) The current that must be fed to the antenna (b) The average power radiated by the antenna.arrow_forwardThe total dipole moment may reach a significant magnitude as a result of random .orientation True Falsearrow_forwardQ2 A parabolic dish antenna has a diameter of 5 meter, operating at 30 GHz frequency. a) What is the effective area A, of the antenna? b) What is the antenna power gain in ratio and in dBi?arrow_forward
- A dipole is a pair of point charges of equal magnitude and opposing sign that are .separated by a distance True Falsearrow_forwardA halfwave dipole with a total conductor length of 1 m is used as a transmit antenna to radiate electromagnetic energy. At a distance of 500 m from this antenna in the direction of maximum radiation, what is the free space path loss (dB)? Consider the end effect of the dipole.arrow_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: 1. Center frequency, f 2. Wavelength, A 3. Length of Driven Element, LDE 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_forward
- 3) What are the applications of log-periodic dipole antenna?arrow_forwardTwo half-wave dipoles are arranged as shown in the figure below, with antenna 1 transmitting 300W at 300MHz. The current maximum in antenna 1 is known to be 2.87 A. Find the open-circuit voltage induced at the terminals of the receiving antenna, which is antenna 2. Hint: Consider the vector effective length concept. Notice that the antennas are 100m apart from each other. Take the impedance of free space to be 120m 2, and the speed of waves to be 3x108 m/s. Select one: O 0.2 V O O 0.5 V 1.0 V 1.2 V 2₁₁ 0₂ = 90° 60° r = 100 marrow_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
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