Re: NEC-LIST:Out of band response of a phased array.

That's a wide open question depending on all sorts of details like the element
behavior, array factor, the phase shifters, preamps etc etc.

Probably all one can say without details, there will be a lower cutoff, like a
highpass filter. Below somewhere in mid X-band you're likely in the clear
with good rejection by waveguide-beyond-cutoff action.

Above the array operating band you might worst-case it by assuming the gain
(beamwidth) stays sort of constant. This has been with big reflector antenna
harmonic interference guesstimating.

Yes, above the operating band the beam breaks up into several "beams" due to
high order waveguide modes but those "beams", even though there are now
several, are close-spaced and ragtag beams, but with respectable gain, generally
staying within, or at least very near to, the angular confines and boresight of the original
single beam enjoyed within the operating band. If you think of it roughly as a set
of monopulse "difference" patterns (beams) being formed this view may clarify.

Not very valuable but a crude view may be better than nothing and one does get
desperate at times.................

dab

At 12:35 PM 5/23/2002 -0500, you wrote:
>Can some one point me to information on how phased arrays, operating in the
>10 to 15 GHz range, respond to out of band signals?
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Dan Bathker

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