Fundamentals of Applied Electromagnetics (7th Edition)
7th Edition
ISBN: 9780133356816
Author: Fawwaz T. Ulaby, Umberto Ravaioli
Publisher: PEARSON
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Chapter 9, Problem 37P
(a)
To determine
The array factor and plot the pattern in the
(b)
To determine
The array factor and plot the pattern in the
(c)
To determine
The array factor and plot the pattern in the
(d)
To determine
The array factor and plot the pattern in the
(e)
To determine
The array factor and plot the pattern in the
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Two antennas located at points A and B are broadcasting radio waves of frequency 96 MHz. The signals start in phase with each other. The two antennas are separated by a distance d=11.2 m. An observer is located at point P on the x axis, a distance x=97 m from antenna A. The points A, P and B form a right triangle.
A) What is the phase difference between the waves arriving at P from antennas A and B? Enter your answer in radians (rad). 1.2957 rad (correct)
B) Now observer P walks along the x axis toward antenna A. What is P's distance from A when they first observe fully constructive interference between the two waves? 20.0704 m (incorrect)
C) If observer P continues walking until they reach antenna A, at how many places along the x axis (including the place you found in the previous problem) will they find maxima in the radio signal due to constructive interference? 4 (incorrect)
Can you please help with parts B and C.
If the Directivity of an antenna is defined by
D = Do sin 0= 1.8 sin 0
Draw/Sketch the polar plot of the Directivity of the antenna and show the computations
(for angles: 0°, 30°, 45°, 60° and 90%).
An antenna has a total width of 45 cm and total length of 160 cm is designed to radiate at 840 MHz, Determine the field regions that surround the antenna?
Antenna plezz solve Q
Chapter 9 Solutions
Fundamentals of Applied Electromagnetics (7th Edition)
Ch. 9.1 - What does it mean to say that most antennas are...Ch. 9.1 - What is the radiated wave like in the far-field...Ch. 9.1 - In a Hertzian dipole, what is the underlying...Ch. 9.1 - Outline the basic steps used to relate the current...Ch. 9.1 - A 1 m long dipole is excited by a 5 MHz current...Ch. 9.2 - Prob. 5CQCh. 9.2 - What is the magnitude of the directivity of an...Ch. 9.2 - An antenna has a conical radiation pattern with a...Ch. 9.2 - Prob. 3ECh. 9.3 - What is the physical length of a half-wave dipole...
Ch. 9.3 - How does the radiation pattern of a half-wave...Ch. 9.3 - How does the radiation efficiency of a...Ch. 9.3 - Prob. 4ECh. 9.3 - Prob. 5ECh. 9.5 - Prob. 6ECh. 9.5 - At 100 MHz, the pattern solid angle of an antenna...Ch. 9.6 - If the operating frequency of the communication...Ch. 9.6 - Prob. 9ECh. 9.6 - Prob. 10ECh. 9.8 - Verify that Eq. (9.86) is a solution of Eq. (9.85)...Ch. 9.8 - Prob. 12ECh. 9.8 - What condition must be satisfied in order to use...Ch. 9.8 - Derive an expression for the array factor of a...Ch. 9.8 - Prob. 15ECh. 9.11 - Prob. 11CQCh. 9.11 - Prob. 12CQCh. 9.11 - Prob. 13CQCh. 9.11 - Prob. 14CQCh. 9.11 - Prob. 15CQCh. 9 - A center-fed Hertzian dipole is excited by a...Ch. 9 - A 50 cm long center-fed dipole directed along the...Ch. 9 - Prob. 3PCh. 9 - Determine the following: (a) The direction of...Ch. 9 - Repeat Problem 9.4 for an antenna with...Ch. 9 - A 2 m long center-fed dipole antenna operates in...Ch. 9 - Repeat Problem 9.6 for a 20 cm long antenna...Ch. 9 - Prob. 9PCh. 9 - An antenna with a radiation efficiency of 90% has...Ch. 9 - Prob. 11PCh. 9 - The normalized radiation intensity of a certain...Ch. 9 - Repeat Problem 9.6 for a 1 m long half-wave dipole...Ch. 9 - Prob. 14PCh. 9 - A 50 cm long dipole is excited by a sinusoidally...Ch. 9 - Prob. 16PCh. 9 - For a dipole antenna of length l = 3/2, (a)...Ch. 9 - Prob. 18PCh. 9 - Prob. 19PCh. 9 - Prob. 20PCh. 9 - A car antenna is a vertical monopole over a...Ch. 9 - Determine the effective area of a half-wave dipole...Ch. 9 - A 3 GHz line-of-sight microwave communication link...Ch. 9 - A half-wave dipole TV broadcast antenna transmits...Ch. 9 - A 150 MHz communication link consists of two...Ch. 9 - Consider the communication system shown in Fig....Ch. 9 - The configuration shown in Fig. P9.27 depicts two...Ch. 9 - Prob. 28PCh. 9 - The configuration shown in Fig. P9.29 depicts a...Ch. 9 - Prob. 30PCh. 9 - Prob. 31PCh. 9 - A uniformly illuminated rectangular aperture...Ch. 9 - An antenna with a circular aperture has a circular...Ch. 9 - Prob. 34PCh. 9 - Prob. 35PCh. 9 - Prob. 36PCh. 9 - Prob. 37PCh. 9 - Prob. 38PCh. 9 - Prob. 39PCh. 9 - Prob. 40PCh. 9 - Find and plot the normalized array factor and...Ch. 9 - Prob. 44PCh. 9 - A three-element linear array of isotropic sources...Ch. 9 - An eight-element linear array with /2 spacing is...Ch. 9 - A linear array arranged along the z axis consists...
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- 9. If the beam width of an antenna in two orthogonal planes are 30° and 60°. Then the directivity of the antenna is: a) b) 18 c) 36 d) 12 24 ECarrow_forwardThe half power beam width of an antenna in both θ and φ are 400 each. Then the gain of the antenna is: a) 23 b) 25 c) 14 d) 27arrow_forwardA parabolic dish antenna has a conical beam 20° wide, Find the directivity of the antenna.arrow_forward
- The gain of a parabolic reflector antenna is 1000 when the frequency is 300 MHz. If the mouth of the reflector aperture is circular, then what will be the aperture of the mouth?arrow_forwardA pyramidal horn antenna has aperture dimentions of 8 cm x 4 cm. If the wavelength is 3.75 m, then what will be the directivity of the horn antenna? Express the answer in degrees.arrow_forwardAn antenna radiates in free space and 12 sin e - cos(27 X 10°t – Br)ag mA/m H = Find the corresponding E in terms of B.arrow_forward
- 9. If the beam width of an antenna in two orthogonal planes are 300 and 60°. Then the directivity of the antenna is: a) 24 b) 18 c) 36 d) 12arrow_forwardCan you solved that problem? notice that the parabolic antenna = 10 meters; and the efficiency 0.65.arrow_forward5. When a power Pt is transmitted by an antenna, amount of energy incident on the target is given by the expression: a) PtxG/4TR² b) Pt/4πR² c) ptx4 TR²/G d) None of the mentionedarrow_forward
- Rin X in 1. The following input impedance curves have been measured for a straight wire antenna as a function of frequency. 2002 1 170002 r 4 36.5Ω 2 124 -60092 f(GHz) f(GHz) (a) Is it a dipole or monopole? What is the physical length of this antenna in centimeters? (b) What is the VSWR, on a 5002 transmission line feeding this antenna at 1GHz, 2GHz, and 4GHz?arrow_forwardShow that the directivity of isotropic antenna is 1.arrow_forwardAn antenna has Umax = 12 W/sr and U, = 9 W/sr and a radiation efficiency of 90%. The gain of the antenna is: O A. 0.75 O B. 0.675 O C. 1.2 O D. 1.33arrow_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