Comparison Between the Single- and Double-Slab Array

10 COMPARISON BETWEEN THE SINGLE- AND DOUBLE-SLAB ARRAY 

The determination of the locus for the scan impedance for a single slab in Fig. 6.10 and a double slab in Fig. 6.11 is only qualitative. However, the reduction of VSWR and to some extent an increase in bandwidth in the double-slab case is quite obvious. Inspection of the figures of the two cases shows that the primary reason is that the double-slab case produces a smaller variation of the real part of the scan impedance while the imaginary part must be balanced very carefully with the groundplane reactance Z2+ and the antenna reactance In other words, a parametric study of actual calculated curves should be undertaken. A typical example will be given in the next section. 

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