Fundamentals of Electromagnetics with Engineering Applications
1st Edition
ISBN: 9780470105757
Author: Stuart M. Wentworth
Publisher: Wiley, John & Sons, Incorporated
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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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What will be the directive gain of an isotropic antenna? I need the solution urgently and that's why I paid. Please help.
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…
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.
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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- The gain of an antenna is 25.5 dB. What will be the gain when expressed as a linear quantity?arrow_forward1. The relationship between antenna efficiency and radiated power A. no relation B. Direct proportion C. Reverse fit D. No relation 2. At log-periodic antenna, if the frequency band increased then the number of element will be: A. Increased B. Decreased C. Not effected D. equally 3. At helical antenna the input resistance affected by increase the operating frequency. A. Increases B. Decreases B. equally D. not effected 4. If the diameter of isotropic antenna is 5cm and wavelength is 10 cm, then the far-field region is: A. 10 cm B. 5 cm C. 5m D. 10 m 5. The axial ratio of helix antenna is 1.1, what is the number of turn at twice the axial ratio? A. increases B. Decreases C. not affected C. equallyarrow_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
- Design a dipole antenna with 1 reflector and 3 director whose frequency is operating from 115MHz to 255 MHz. (Use equations and Special characters in your solutions and answers) Compute for the: 4. Length of Director, L 5. Length of Reflector, LR 6. Spacing from Director to Driven Element, S R-DE 7. Spacing from Driven Element to Director, S DE-D 8. Spacing from Director 1 to Director 2, S D1-D2 9. Spacing from Director 2 to Director 3, S D2-D3 10. Length of Boom, LBarrow_forwardList 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_forward
- A)-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. Write a note on smart antennas.arrow_forwardImpedance 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_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