Assignment7 - zero at the top of the mast and the earth to...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
EC501_Assignment(2008) (Antennas and Radiating Systems) 1.A small filamentary rectangular loop of dimension L x and L y lies in the xy-plane with its center at the origin and sides parallel to x- and y-axes. The loop carries a current i ( t )= I 0 cos t . Assuming L x and L y to be much less than the wavelength, Find the instantaneous expression for the following the quantities at a point in the far zone: a)vector magnetic potential A, b)electric field intensity E , c)magnetic field intensity H . 2.The transmitting antenna of a radio navigation system is a vertical metal mast 40(m) in height insulated from the earth. A 180(kHz) source sends a current having an amplitude of 100(A) in to the base of the mast. Assuming the current amplitude in the antenna to decrease linearly toward
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: zero at the top of the mast and the earth to be a perfectly conducting plane, determine: a)the effective length of the antenna , b)the maximum field intensity at a distance 160(km) from the antenna , c)the time-average radiated power, d)the radiation resistance. 3.Sketch the polar radiation pattern versus for a thin dipole antenna of total length 2 h =1.25 . Determine the width of the main beam between the first nulls. 4.Derive the expressions for the electromagnetic field in the far zone of a small filamentary loop of radius 'b' carrying a uniform time-harmonic current, i ( t )= I cos t , around its circumference....
View Full Document

This note was uploaded on 09/13/2010 for the course EE EE501 taught by Professor Sial during the Spring '10 term at YTI Career Institute.

Ask a homework question - tutors are online