Engineering Electromagnetics
9th Edition
ISBN: 9781260029963
Author: Hayt
Publisher: MCG
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Chapter 14, Problem 14.15P
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A system starts with omnidirectional transmit antennas. This produces a coverage area with a radius of 1500 m when there is a pathloss exponent of 3.8. If directional antennas are implemented with a gain of 7.070 dB, what does the radius become (in meters)?
2.) The power density is 4 mW/m² at some distance R from an isotropic antenna. The isotropic antenna is replaced with a different antenna and the power density measured is now 60 mW/m² at the same distance R. What is the gain (in dB) of the second antenna?
3.) The received power at an airplane is calculated as Pr=-43 dBm at a range of 13 miles using free-space propagation. Determine the received power (in dBm) at a range of 52 miles.
3.8 An earth station antenna has a circular aperture with a diameter of 6.5 m and an aperture efficiency of 68% at 18.6 GHz. a. Calculate the gain of this antenna and estimate its beamwidth. b. The apertiite elficienes f the antenna is 6-1% at a frequency of 29.0 GHz. Cal- culate the gan of this ntnnrand istihate its beamwidth at 29 GHz. of
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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- At 20 GHz, the gain of a parabolic dish antenna of I meter diameter and 70%efficiency is-------arrow_forward1.) What is the reflection coefficient at the spectral point of reflection in the near- earth propagation model? 2.) When determining the best estimate of the power received in the near-earth model, when the free-space and near-earth received powers are nearly equal, what do you do to determine the best estimate of the received power? 3.) In the LOS propagation model how would you determine the geometric distance to the horizon from the transmit antenna? 4.) How much power (in mW) is received when a 1 GHz signal with a power density of 5 mW/m² is intercepted by an antenna having a gain of 10 dB? step by step and clear thanksarrow_forwardWhat is the power density at a rangeof 6km radiated by a particular antenna ifits gain is 30dBd and transmitter poweroutput is 30W? (Gain must be withrespect to the isotropic radiator)arrow_forward
- Consider a receiving antenna with a ground value of 20 dB and an equivalent noise temperature of 12dBK, the G/T factor will be: Select one: A. The value is 32dB/K b. The value is 8dB/K c. None of the results is correct d The value is -8db/Karrow_forwardA transmitting antenna, Tx and a receiving antenna, Rx are separated by d=1.25 km. The efficiency and Directivity of Tx antenna are = 93% and D = 14.13 operating at 2.45 GHz.a) Find the Gain (in dB) and effective aperture of the Tx antenna.b) Determine the Effective aperture of Rx antenna and transmitter power is required on Tx to achieve this signal level, Power receive -47dBm and the.i. If the Rx antenna Gain is Isotopic.ii. If the Rx antenna Gain is 3 dB.arrow_forwardAn antenna used for transmitting has a power gain of 20, directive gain of 22, and an input power of 200 W. Determine: 1.EIRP in W, dBm and dBW. 2.Power density at a distance of 5 km from the antenna along the direction of maximum radiation. 3.Antenna efficiency 4. Radiated power from an antenna 5.Radiation resistance and antenna effective resistance if current at feedpoint is 2 A.arrow_forward
- A satellite in synchronous orbit is used to communicate with an earth station at a distance of 7.6 ×10^7 m. The satellite has an antenna with a gain of 15 dB and a transmitter power of 3 W. The earth station uses an antenna with gain 50 dB. The frequency band is at f = 9.8 GHz. What is the free space path loss in dB? Also, determine the received power level at the output of the receiver antenna in dBW.arrow_forwardA horn antenna is operated 8.2 to 12. 4 GHz. The aperture of the antenna is (L x W ) 32 x 42 mm. Determine: a) Reactive near-field region at 8.2 GHz and at 12.4 GHzb) Far-field region at 8.2 GHz and at 12.4 GHzarrow_forwardDetermine the directivity in dB for an antenna that produces a power density of 10 uW/m2 at a point in space when a reference antenna produces 0.4 uW/m2 at the same point.arrow_forward
- Calculate the guided intrinsic impedance at 20 GHz for the lowest-order mode of therectangular waveguide with dimensions a=0.7 in and b=0.3 in.Take relative permittivity as 2.76.arrow_forwardMillimeter-wave radar generates a narrower beam than conventional microwave radar, making it less vulnerable to antiradar missiles than conventional radar. (a) Calculate the angular width 20 of the central maximum, from first minimum to first minimum, produced by a 220 GHz radar beam emitted by a 54.0-cm-diameter circular antenna. (The frequency is chosen to coincide with a low-absorption atmospheric "window.") (b) What is 20 for a more conventional circular antenna that has a diameter of 1.64 m and emits at a wavelength of 1.6 cm?arrow_forward1.) A communication system is defined below:Transmitter Power: = 45 dBm; Frequency = 1 GHzTransmit Antenna: Gain = 12 dB, height above ground = 50 meters;Receive Antenna: Gain = 6 dB, height above ground= 2.5 metersFind the received power (in dBm) at a range of 4 kilometers:a. using the free-space range equation b. using the near-earth range equation Using the results of the calculations in a & b above: c. determine the best prediction of the received power (in dBm) at the 4 kilometer range. 2.) A transmitter operating at 80 MHz has an output power of 1.5 kW which is fed to an antenna with a gain of 20 dB. Determine the "keep-out" distance (in meters) required to meet the safety standard. clear and easy to understand. Thanksarrow_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