ps10 - MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of...

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------------------------------------------------------------------------------ MASSACHUSETTS INSTITUTE OF TECHNOLOGY± Department of Electrical Engineering and Computer Science± Problem Set No. 10 6.630 Electromagnetics Issued: Fall Term 2006 Due: Quiz 2: Dec 5, Tuesday . Problem P10.1 A radio station is located on the coast, west of a city, as shown in Figure1(a). The transmitting antenna tower may be modeled as a Hertzian dipole antenna of dipole moment I o ± . (a) The radio station was able to erect another antenna tower. Relative to the ²rst antenna tower, at what distance d should the second tower be placed and with what phase di³erence ψ ( π<ψ π ) should it be fed, so that there is a null in the radiation pattern in the direction of the ocean and no ”dead” spots in the reception areas as shown in Figure1(b). (b) As shown in Figure1(c), consider another radio station which must serve two cities, sending most of the power over the land area and little power in the direction of the
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ps10 - MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of...

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