Handbook of Antenna Design, Vol. 2 by A.W.Rudge, K. Milne, A.D. Olver, P.Knight
By A.W.Rudge, K. Milne, A.D. Olver, P.Knight
1) Authored by means of a multi-national workforce of antenna specialists of overseas status. 2) provides the rules and purposes of antenna layout, with emphasis upon key advancements within the final 15 years. three) primary historical past thought and analytical concepts defined intimately the place applicable. four) contains huge layout information and various examples of functional program. five) bargains with a truly wide variety ofRead more...
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Additional resources for Handbook of Antenna Design, Vol. 2
Example text
For a uniformly spaced array, rn~(ji— \)d.
08. 6515. The corresponding space factor has zeros at u = 2, 3, 4, . . 5981. 7 dB. 0dB and — 56 dB. 5 to centre it does lower the first and raise the second, but the overall SLR is now 1 dB worse. A comparison of several low sidelobe distributions is illuminating. 7 dB for an example, since this is the Hamming value. 7 gives the first ten pattern zeros for the Taylor one-parameter, the Hamming, and Taylor n = 6 and h = 10. 6. 8, where the spacings between adjacent zeros are shown. Clearly, the Hamming is wasting zero spacing on the first several sidelobes.
All characteristics of the oneparameter distribution are thus readily available. 0 aperture co-ordinate Taylor one-parameter aperture distributions Fig. 23 The half beamwidth u$ given in the Table is in terms of u. 5 gives values of normalised beamwidth for various SLR and L/X. 3505 1-5 13 12 1-1 10 09 0-8 0-7 0-6 0-5 10 15 20 25 30 35 sidelobe r a t i o . dB Fig. 24 Normalised beamwidth vs. sidelobe ratio for linear one-parameter source An SLR of 40 dB, for example, gives a beamwidth about 50% larger.