# Modern Antenna Design by Thomas A. Milligan

By Thomas A. Milligan

• A sensible publication written for engineers who layout and use antennas
• The writer has a long time of palms on event designing antennas that have been utilized in such functions because the Venus and Mars missions of NASA
• The e-book covers all vital themes of recent antenna layout for communications
• Numerical equipment can be integrated yet in basic terms up to are wanted for useful applications

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Extra resources for Modern Antenna Design

Example text

We proceed now to find the Fourier transform of the RepT(. ) function, which in effect is to find the Fourier transform of a periodic function. 27, where we see that the Fourier transform of the periodic function is a line spectrum with lines at intervals of 1/T and the envelope Y(f), the Fourier transform of one period of the periodic function. lo Strictly speaking, one cannot take the Fourier transform of a periodic signal because periodic signals have infinite energy. 23h) has validity if time and frequency are exchanged.

Cixi . . cn-1xn-l xn. + + + + + + + configuration. As is thoroughly discussed in Chapter 6, the sequences generated by such an LFSR with an initial loading of nonzero n-tuples in the n stages, are periodic sequences with length P = 2" - 1, and there are P different sequences of length P that are shifted versions of the given initial sequence of length P. The sequences generated in this way are the ones used. What is so special about these sequences that makes it possible to realize such CDMA systems as IS-95?

5 Let us assume that a linear filter, designated "ideal filter #I," has a rectangular amplitude frequency characteristic given by H ( f ) = Rect(f /Rc), where Rc is the cutoff frequency. 16 Fourier transform pair Rect(t) sinc( f ). 17 Fourier transform pair Rect(t/Tc) - Tcsinc(Tc f ). 18. Note that ideal filter #1 is has an impulse response that is neither finite (in time extent) nor causal. 6 We will show that shifted sinc functions are mutually onhogonal, namely that where m and n are integers.