By Bert Kinzey
Read or Download A-6 Intruder Part 1 Bomber and Tanker Versions in Detail & Scale Vol 24 PDF
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Extra info for A-6 Intruder Part 1 Bomber and Tanker Versions in Detail & Scale Vol 24
With the above formulas it will always be possible, if the dimensions and operating frequency of the antenna are known, to calculate the values of the antenna gain and the width of the -3-dB beam quickly and with sufficient accuracy. This is very useful in systems practice. It should also be recalled that an antenna is normally a reciprocal device, that is, its behavior on transmission is identical to its behavior on reception. This means that the transmission gain is equal to the reception gain.
Chaff A chaff system comprises a launcher that ejects cartridges. These cartridges explode within a certain distance of the protected platform and disperse a multitude of tiny dipoles into space. These dipoles remain suspended in space, producing a cloud that radiates back radar signals. 25). T o create these corridors, aircraft flying at great heights dispense an enormous quantity of chaff over a very wide area. Sometimes chaff is launched from a platform as a defense against an attacking weapon system.
3 Equivalent solid angle. Frequently it is convenient t o assume that the antenna radiates only in the neighborhood of the direction of maximum radiation. 9) BBPB and GE- 25,000 BBPB The pattern of the antenna beam, which is to say, the electric field radiated as a function of the angle measured from the boresight, is, for a uniformly illuminated rectangular antenna whose dimensions are dox d,, of the form sin xlx. 4 Normalized electric field and radiated power patterns for a uniformly illuminated antenna.