ground level 30 km away, (c) the power received by an aerial of gain 12 dBi, and (d) the transmitted power. 6.1 Show that the radiation resistance of an earthed X/4 vertical aerial is approximately 40 22. An aerial of this type is supplied with a current of 10 A r.m.s. at 4 MHz. Calculate (a) the effective height of the aerial, (b) the electric field strength produced at a point at

ground level 30 km away, (c) the power received by an aerial of gain 12 dBi, and (d) the transmitted power. 6.1 Show that the radiation resistance of an earthed X/4 vertical aerial is approximately 40 22. An aerial of this type is supplied with a current of 10 A r.m.s. at 4 MHz. Calculate (a) the effective height of the aerial, (b) the electric field strength produced at a point at

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Similar questions

23: (a) What does mean by directivity of antenna? Explain For an antenna, derive an expression for effective aperture in term of the gain. An FM broadcast radio station has an antenna with directivity of 2.5 dB and efficiency of 76%. The transmitted power is 100 kW. Calculate the effective isotropic radiated power. c) With aid of equations, explain how the motion of charges and curved or bent wire are the source of radiation in antenna theory.
2- Directivity is inversely proportional to...... (A) Beamwidth (B) FNBW (C) Beam area (D) HPBW Z so reflection coefficient is 12 4- What determines antenna polarization? (A) The direction of the electric field vector (B) The direction of the radiated wave (C) The direction of the magnetic field vector (D) The frequency of the radiated wave 5- Antennas convert -to- (A) Electrical into electromagnetic (B) electromagnetic into electrical (C) Both A and B (D) None of the these
A 100-turn loop antenna of radius 20 cm operating at 10 MHz in air is to give a 50 mV/m ﬁeld strength at a distance 3 m from the loop. Determine (a) The current that must be fed to the antenna (b) The average power radiated by the antenna.
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.
A 1-m long dipole antenna is driven by a 150 MHz source having a source resistance of 50 ohms and a voltage of 100 V. If the ohmic resistance of the antennas is given by RL = 0.625 ohms, find the:(a) Current going into the antenna (Iant)(b) Power dissipated by the antenna(c) Power radiated by the antenna(d) Radiation efficiency of the antenna
Consider the path loss over a reflecting surface (2 ray model). Derive an expression for Ad (difference between direct path and reflected path), and P, (received power). Write down all the assumptions made.
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?
What 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.
The radiation resistance of a dipole antenna is 359 ohms and the antenna is operating at a wavelength of 0.05 meters. What will be the effective length of this dipole antenna? What
Question 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)
The directivity of the infinitesimal (ideal dipole) is equal to the directivity * of short dipole, that is because they have the same length They have the same gain they have the same normalized field they have the same electric field
The radiation resistance of a dipole antenna is 355 ohm. What will be the efective length of the antenna in terms of the wavelength?