Practical_Antenna_Handbook_0071639586
270 P a r t I V : D i r e c t i o n a l H i g h - F r e q u e n c y A n t e n n a A r r a y s A B L 1 L 4 L 2 L 3 Figure 11.3 Phase-shifting antenna circuit. J 1 antenna A J 3 transmitter J 2 antenna B L 1A L 1B L 1C S 1 Figure 11.4A Phasing transformer circuit.
C h a p t e r 1 1 : V e r t i c a l A r r a y s 271 though the transformer adds a small amount of loss, it is applied equally to both elements, so the amplitudes of their drive currents remain equal regardless of which mode the array is operated in. Be very sure, as shown in Fig. 11.4B, the coaxial cables to the individual elements are identical lengths from the point where they connect to J 1 and J 2 on the transformer housing to the base of either element. A B /4 /4 /2 Length D 1 D 2 D 1 D2 J 1 J 2 J 3 Phasing transformer Figure 11.4B Connection to antennas.
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C h a p t e r 1 1 : V e r t i c a l A r r a y s 271<br />
though the transformer adds a small amount of loss, it is applied equally to both elements,<br />
so the amplitudes of their drive currents remain equal regardless of which mode<br />
the array is operated in.<br />
Be very sure, as shown in Fig. 11.4B, the coaxial cables to the individual elements<br />
are identical lengths from the point where they connect to J 1 and J 2 on the transformer<br />
housing to the base of either element.<br />
A<br />
B<br />
/4 /4<br />
/2<br />
Length D 1 D 2<br />
D 1 D2<br />
J 1 J 2<br />
J 3<br />
Phasing<br />
transformer<br />
Figure 11.4B Connection to antennas.
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