The operation of a space - polarization filter (SPF) that suppresses partially scattered dual - path interference in reception of a dual - path signal is analyzed in the presence of additive noise. The efficiency of the SPF is investigated as a function of the characteristics of the signal and interference fields and of the geometric dimensions of the SPF antenna system. The existence of an optimum antenna - system size Xopt≈(0,3—0,8)λ which delivers the highest SPF efficiencies, is established.
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