EBK FUNDAMENTALS OF APPLIED ELECTROMAGN
7th Edition
ISBN: 8220100663659
Author: ULABY
Publisher: PEARSON
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Chapter 9, Problem 23P
A 3 GHz line-of-sight microwave communication link consists of two lossless parabolic dish antennas, each 1 m in diameter. If the receive antenna requires 10 nW of receive power for good reception and the distance between the antennas is 40 km, how much power should be transmitted?
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A parabolic antenna system is having a dish diameter of 10 m and the feed is connected at 10 GHz. What will be the value of the gain of the antenna?
Assume a system has one transmit antenna and two receive antennas. The instantaneous channel attenuation at two receive antennas are 0.2j and 0.3+0.4j. The system works on an environment with only Gaussian noise and without any interference. If optimum combining is used, what are the weights for the two antennas?A) 0.2j, 0.3+0.4j
B) -0.2j, 0.3-0.4j
C) 0.2j, 0.3-0.4j
D) -0.2j, 0.3+0.4j
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?
please answer both asnwer i don't have much questions left until it expires.
Chapter 9 Solutions
EBK FUNDAMENTALS OF APPLIED ELECTROMAGN
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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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
- What is the distance to the radio horizon for an antenna that is 40 m above the top of a 4000 m mountain peak? kmarrow_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 will be the power gain of a parabolic antenna with 10 m diameter dish and a feed of 10 GHz?arrow_forward
- Multiple Choice directions: Circle the letter of the answers 4. This waveguide component allows power and SWR measurement. a. T section b. Hybrid T c. Directional coupler d. Termination 5. A microwave antenna that has circular polarization. a. Horn b. Helical c. Parabolic d. Phased array 6. The microwave frequency range is in the vicinity of a. 1-300 GHz b. 1-100 GHz c. All of the above d. 1-200 GHz Note: Explanation is not needed just provide the correct answers for each number.arrow_forwardThe answer according to the books is 0.49 mV/marrow_forwardThe answer according to three book is 0.49 mV/m Please don’t submit the answer if the result isn’t the samearrow_forward
- Question: What are the different types of waveguides used in microwave communication and what are their characteristics? How do they differ from each other?arrow_forward9. How high must a receiving antenna be to receive a signal directly from an over-the horizon transmitter whose antenna is 30 ft high? The distance between antennas is 15 mi.arrow_forwardPlease show all steps A parabolic dish antenna has a diameter of 5 meter, operating at 30 GHz frequency.a) What is the effective area Ae of the antenna? b) What is the antenna power gain in ratio and in dBi?arrow_forward
- QUESTION 3 "A microwave link includes two sites that are 10 km apart and uses a center frequency of 9 GHz. On either transmitter or receiver side, a 100-m transmission line that has an attenuation per unit length of 0.01 dB/m is connected to an amplifier and a parabolic reflector antenna. Other losses caused by connectors and insertions incurred on one side amounts to 3 dB. Antenna has a power gain of 20 dB. If the output of the transmitter amplifier is 30 dBm, what is the received signal level (in dBm) at the input of the receiver amplifier? Enter numerical answer in four decimal places. No need for the unit. "arrow_forwardWhich mode of propagation is used by short wave broadcast services having frequency range from a few MHz upto 30 MHz? Explain diagrammatically how long distance communication can be achieved by this mode. Why is there an upper limit to frequency of waves used in this mode?arrow_forwardAt a certain time, the maximum usable frequency (MUF) for transmission at an angle of incidence of 75° is 20MHz. A) What is the critical frequency in MHz? (Use two decimal places for the final answer) B) What will be the optimum working frequency (OWF) in MHz? (Use two decimal places for the final answer)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