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 36P
To determine
The fraction of the moon’s cross section occupied by the beam.
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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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- A C-band radar with an antenna 1.8m in radius transmits 60kw at 6 GHz. If the minimum detectable power is 0.5mw, for a target cross-section of 5msq, Calculate the maximum range in meters Assume the effective area of the antenna is 80% of the actual area.arrow_forwardAn antenna array achieves beam steering in a direction of 30° from the normal propagation direction. If the distance between the array elements (the inter-element distance) is 7.5 cm and the phase shift between the EM waves at adjacent elements is pi/2 radians, what is the frequency of the EM waves being transmitted? Assume the attatched value in calculation.arrow_forwardA 37.4W transmitter at 86.7 MHz will be used to establish VHF communication. Determine the maximum distance at which LOS communication is possible if the transmitting and receiving antennas are 51.2 and 24.68 meters tall, respectively. Determine the receiving point's field strength. Earth's radius is 6353 kilometres.arrow_forward
- Consider a communications satellite that orbits the Earth at a height of about 40,000 km. At this height the orbit period is 24 h, so that it seems to hang motionless above the Earth, which turns underneath the satellite once every 24 h. This is called a "synchronous" satellite. The advantage of such an arrangement is that receiving antennas on the ground can point at a seemingly fixed location of the satellite in the sky and not have to be steered. You have probably seen such fixed receiving antennas pointed at the sky. If the broadcasting antenna on the satellite is 2 m in diameter and broadcasts at a frequency of 10 GHz (f= 10 × 109 Hz), approximately what is the diameter of the region on the ground where the satellite transmission can be picked up?arrow_forwardCalculate the beamwidth in degrees of a parabolic antenna with a diameter of 3 meters, an efficiency of 60% and operates at a frequency of 4GHzarrow_forwardCalculate the power density 25 km away from a 90% efficient dipole if the transmit power is 125W.arrow_forward
- What will be first null beam width of a paraboloidal reflector antenna operating at a frequency of 4 GHz and having a diameter of 20 m?arrow_forward"If a receiving antenna has a gain of 26 dB, calculate its effective capture area (m^2) if its operating at 1.7 GHz. Enter only the numerical value. No need for the unit. Use four decimal places (if the answer is not an integer)."arrow_forwardIf the radiation resistance of an areal antenna is 150 ohms, then estimate the effective height of the antenna with respect to the wavelength.arrow_forward
- What will be the power gain of a parabolic antenna with 10 m diameter dish and a feed of 10 GHz?arrow_forwardDesign a dipole antenna with 1 reflector and 1 director whose frequency is operating from 85 MHz to 247 MHz.arrow_forwardAn isotropic antenna is radiating evenly in the r–direction in free space. The totalelectric field (E0) is 20 V/m at 1-m distance. Determine the following parameters at adistance of 139 m from the antenna. (iii)Find The total radiated power.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