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 8.17P
How long is a
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For the given quarter wave dipole antenna, if the radiation resistance is 50 ohms and the loss resistance is 20 ohm, then estimate the radiation efficiency.
b) Fill in blanks with a suitable answer
1. The bandwidth of an antenna can be broader by increased the...
2. Radiation pattem is . . dime nsional quantity
3. One steradian is equal to . . square degrees
4. The minimum value of the directivity of an antenna is. .
5. The radiation resistance of short dipole is given by...
6. Gain is equal to directivity in case of ...
7. Radiation resistance of antenna is.. .
b) A particular antenna has a VSWR of 2.4. Determine the following and, in each case, show full
working:
i) Reflection coefficient. Please transpose the equation for VSWR and show your working.
ii) Calculate the mismatch efficiency of the antenna. Show your working.
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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- A- A microstrip patch antenna has a length of L=3.5 cm and width W-2 cm and operates at 2.4 GHz. Find the far-field distance for this antenna.arrow_forwardWhat will be the value of the radiation resistance of a monopole antenna of length equal to quarter of wavelength. It is to be noted that the monopole antenna is excited by linear current distribution.arrow_forwardFind the maximum power gain for Hertzian dipole antenna with 0.2 m length at frequency of 2.4 GHz. The antenna must have 15 mW/m radiation intensity at elevation angle of 70°.arrow_forward
- What will be the radiation resistance of a dipole antenna whose effective length is 52.5 nm and wavelength of 40 nm?arrow_forward3) What are the applications of log-periodic dipole antenna?arrow_forwardSince b=2a=1 cm in a hollow rectangular waveguide, the operating frequency of the waveguide must be ........ GHz<f<......GHz for only the dominant mode to propagate?arrow_forward
- Q2 A parabolic dish antenna has a diameter of 5 meter, operating at 30 GHz frequency. a) What is the effective area A, of the antenna? b) What is the antenna power gain in ratio and in dBi?arrow_forwardA thin dipole antenna having a length of one fifteenth of wavelength has a loss resistance of 2.5 ohm. What will be the antenna efficiency?arrow_forwardFor a dipole antenna, the radiation resistance is given as 523 ohms. What will be the effective length of the dipole? Express with respect to the wavelength.arrow_forward
- The radiation resistance of a dipole antenna is 355 ohm. What will be the efective length of the antenna in terms of the wavelength?arrow_forward92. The physical length and impedance of a dipole antenna element is a function of frequency. At resonance, what would be the value of the impedance at the ends of its element? A. Immeasurable C. Low B. High D. Undeterminedarrow_forwardThe PCB monopole antenna shown in figure below is required to be designed for Bluetooth Low Energy wireless mouse operating at 2.45 GHz. What should be the length of the antenna trace in mm. Assume the substrate of the PCB is foam (dielectric constant = 1)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