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Radar System Engineering

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302 ANTENNAS, SCANNERS, AND STABILIZATION [SEC. 9i6<br />

the impedance match in this angular region by absorbing such radiation<br />

as may try to leak across that region as the horn approaches.<br />

9.16. Other Types of Electrical Scanners.—Probably the first electrical<br />

scanner to be used, developed by Bell Telephone Laboratories, operates<br />

This triangular<br />

D<br />

area remains flat<br />

I Fold line<br />

Cylinde; elements<br />

Y.’_z:<br />

E<br />

locus I Feed position, O,<br />

for beam on axis<br />

FIG. 9.30.—Illustration of trapezoid before, during, and after rolling.<br />

F]~. 9.31.—Detail of radial feed horn

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