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Unformatted text preview: Calculate the magnetic field H at P. Show that if d << , the strength of the H field in the far field is proportional to d 2 . 4. ( Antenna Array ) Consider an array of N dipole antennas (N being an odd number) spaced by a distance d from each other along the z-axis. r z n=0 N-1 2 n= N-1 n= - 2 d x Each dipole has length L, with L< so you can treat the dipole as being infinitesimal. Each dipole is fed with a current given by jn t j o n e e I I = n= 2 1 N ,..,0,. . 2 1 N and is a constant. Find the radiated field produced by the antenna array. Sketch the radiation pattern as a function of . 5. ( FEMLAB ) Use FEMLAB 2D In-Plane Waves model to simulate the radiation from a dipole antenna. Assume the working frequency is 1GHz ( = 0.3 meter). Plot the E field magnitude of the radiated wave for antenna length h = /2, 3 /2, 2 , 5 /2....
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This homework help was uploaded on 02/04/2008 for the course EE 151 taught by Professor Psaltis during the Spring '05 term at Caltech.
- Spring '05