Download e-book for kindle: Computer Techniques for Electromagnetics by Raj Mittra

By Raj Mittra

ISBN-10: 0080168884

ISBN-13: 9780080168883

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174) r 1 where r1 = . /{R 2 + a2 + (z + s/2)2 ) , r2 = ' /{R 2 + a2 + (z — s/2) 2 ). 176) These expressions are accurate if p = 0 or ri and r2 are large in comparison with the quantity ap (Richmond, 1966b). For the segmentation problem of interest here, these conditions will hold true. To calculate the elements in the impedance matrix, we must in effect calculate the tangential component of the electric field radiated by segment] when the observation point is at the center of segment i. Details of this calculation may be found in Appendix III.

Shreve). 56 G. A. THIELE 100 segments as shown in Fig. 34. For longer lengths of wire more segments are required. For instance, Fig. 35 shows the convergence for a total wire length of one wavelength and the results indicate that at least 126 segments are required. In brief, Shreve (1970) has shown the effects of adding more turns to the multiturn loop antenna while keeping the physical length of conductor constant and the same turn to turn spacing are three-fold. That is to say, the bandwidth decreases, the first antiresonant frequency is lowered somewhat, and the radiation resistance at non-antiresonant frequencies is reduced.

Good agreement is seen to exist between the experimental pattern and the theoretical one obtained with the point-matching method. In fact, the front-to-back ratio is precisely the same. 24 show calculated E-plane and H-plane patterns, respectively, for a twenty-seven-element array. This was the largest number of elements that could be handled conveniently by the computer program on the IBM 7094. With a computer of larger memory, such as the IBM 360-75 or CDC 6600, more elements could be accommodated.

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Computer Techniques for Electromagnetics by Raj Mittra


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