Radar Cross Section of Dipole Phased Arrays with Parallel Feed Network by Hema Singh H. L. Sneha & Rakesh Mohan Jha

Author:Hema Singh, H. L. Sneha & Rakesh Mohan Jha
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

3.3 Finite Length Dipole Array with Actual Reflection Coefficients

So far the reflection coefficients at various levels in the feed network were assumed to be constant and identical (r r = r p = r c = r s = r d = 0.2) for each dipole element in the array. However in actual array design, these reflection coefficients depend on the impedance mismatches at each junctions in the antenna system and thus vary in accordance with the design parameters of the phased array. Since these reflection coefficients control scattered fields directly, it is necessary to analyze their variation for accurate RCS estimation and hence to have control over the scattering within the antenna system.

Figure 19 shows the RCS of a 64-element half-wavelength dipole array considering the mismatches at first level of couplers, with the reflection coefficients determined in terms of impedances.

Fig. 19RCS pattern of a 64-element dipole array for computed reflection coefficients, considering single level of couplers

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