Fundamentals of Electromagnetics with Engineering Applications
1st Edition
ISBN: 9780470105757
Author: Stuart M. Wentworth
Publisher: Wiley, John & Sons, Incorporated
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Textbook Question
Chapter 8, Problem 8.49P
Design an open-ended shunt-stub matching network to match a half-wave dipole transmitting antenna to a source with
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Problem 3. A receiver front end has a noise figure of 10 dB and a gain of
60 dB and a bandwidth of 12 MHz. The input signal power is 10-11 W. The
antenna temperature is 180° K. Find Te, Ts, Nout, SNRin and SNRout. You
may use To=290° K and Boltzmann's constant equals 1.38 x 10-23 J/K.
15)
This MCQ QUESTION FROM ANTENNA ENGINEERING course.
1. Which of the following describes an isotropic antenna?
a) A grounded antenna used to measure earth conductivity
b) A theoretical antenna used as a reference for antenna gain
c) A horizontally polarized antenna used to compare Yagi antennas
d) A spacecraft antenna used to direct signals toward the earth.
2. Why would one need to know the feed point impedance of an antenna?
a) To calculate the front-to-side ratio of the antenna
b) To calculate the gain of the antenna
c) To match impedances to minimize standing wave ratio on
rans
sion line
d) To measure the near-field radiation density from a transmitting antenna
3. What is a folded dipole antenna?
a) A type of ground-plane antenna
b) A dipole configured to provide forward gain
c) A dipole constructed from one wavelength of wire forming a very thin loop
d) A dipole one-quarter wavelength long
4. What is meant by antenna gain?
a) The final amplifier gain minus the transmission-line losses, including any phasing lines
present
b) The…
Chapter 8 Solutions
Fundamentals of Electromagnetics with Engineering Applications
Ch. 8 - Prob. 8.1PCh. 8 - What is the pattern solid angle and the...Ch. 8 - Sketch an appropriate cross section of the...Ch. 8 - Prob. 8.5PCh. 8 - Prob. 8.6PCh. 8 - Prob. 8.7PCh. 8 - Prob. 8.8PCh. 8 - Prob. 8.9PCh. 8 - Prob. 8.10PCh. 8 - Prob. 8.11P
Ch. 8 - Prob. 8.12PCh. 8 - Suppose in the far field for an antenna at the...Ch. 8 - Prob. 8.14PCh. 8 - Prob. 8.15PCh. 8 - Prob. 8.16PCh. 8 - How long is a 1.5 -long dipole antenna at 1.0 GHz?...Ch. 8 - Prob. 8.18PCh. 8 - Prob. 8.19PCh. 8 - Prob. 8.20PCh. 8 - Prob. 8.21PCh. 8 - Prob. 8.22PCh. 8 - Prob. 8.23PCh. 8 - Prob. 8.24PCh. 8 - Prob. 8.25PCh. 8 - Prob. 8.27PCh. 8 - Prob. 8.28PCh. 8 - Prob. 8.29PCh. 8 - Prob. 8.30PCh. 8 - Prob. 8.31PCh. 8 - How long is a 0.75 monopole antenna at 1.0 GHz?...Ch. 8 - Prob. 8.33PCh. 8 - Prob. 8.34PCh. 8 - Prob. 8.35PCh. 8 - Prob. 8.36PCh. 8 - Prob. 8.37PCh. 8 - Prob. 8.38PCh. 8 - Two small loop antennas, each oriented in the xy...Ch. 8 - Prob. 8.40PCh. 8 - Prob. 8.41PCh. 8 - Prob. 8.42PCh. 8 - A particular broadside antenna array consists of...Ch. 8 - Prob. 8.44PCh. 8 - Prob. 8.45PCh. 8 - Prob. 8.46PCh. 8 - Prob. 8.47PCh. 8 - Prob. 8.48PCh. 8 - Design an open-ended shunt-stub matching network...Ch. 8 - Prob. 8.50PCh. 8 - Prob. 8.51PCh. 8 - Prob. 8.52PCh. 8 - Prob. 8.53PCh. 8 - Prob. 8.54PCh. 8 - Prob. 8.55P
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- I hope to write a simple summary so that I can save it because I have exams Difference between Hertz Antennas (half-wave) and Marconi (quarter-wave) Antennas.arrow_forwardAn antenna with a radiation resistance of 48 Q, a loss resistance of 20 and a reactance of 50 Q is connected to a generator with an open circuit voltage of 10 V and internal impedance of 50 through a transmission line with a characteristic impedance of 100 . Determine the power supplied by the generator and power radiated by the antenna.arrow_forwardQuestion 3 (a) A television receiver's folded dipole antenna has an impedance of 600 0. If a RG-6 coaxial (75 0) coaxial cable is used, calculate the ratio required to match the cable and the antenna. (b) Figure Q3. (b) shows a beam antenna consisting of a dipole, a reflector, and a director. Design the beam antenna given that it is cut for a frequency of 200 MHz and assuming a velocity coefficient of 0.85. The length of the reflector is 5% more than the length of the dipole and the length of the director is 5% less than the length of the dipole. 0.15 Figure Q3(b)arrow_forward
- List the applications of Extremely Low Frequency band? State the range of its wavelength?arrow_forwardA transmitter has an output power of 50 W. It is connected to its antenna by a feed line that is 25 m long and properly matched. The loss in the feedline is 5 dB/100m. The antenna has a gain of 8.5 dBi. a) How much power reaches the antenna? b) What is the EIRP in the direction of maximum antenna gain? c) What is the power density 1 km from the antenna, in the direction of maximum gain, assuming free-space propagation?arrow_forwardA)-An antenna has the following S-parameter , find the resonant frequency (f.) and the bandwidth (BW). S. -lo d3 - 20-dB -30 dB 1 2. 3. 4. B)-sketch the radiation pattern of a directional antenna indicating the main lobe , side lobes and back lobe , then explain how to calculate the beam width?arrow_forward
- Impedance 600 400 200 -200 400 -600 Resistance Reactance -800 20 30 40 50 60 70 80 90 100 110 120 Frequency (MHz) The input resistance and reactance of unknown antenna is given above, and it need to be match to 75-ohm coaxial cable. Which frequency (in MHz) would you operate this antenna at? Impedance (ohms)arrow_forward30(This MCQ QUESTION FROM ANTENNA ENGINEERING course.)arrow_forward7) This MCQ QUESTION FROM ANTENNA ENGINEERING course. just write for me the the correct answer.arrow_forward
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