Design of Shared Aperture Radar Arrays With Low Sidelobe Level of the Two-Way Array Factor

Lowering the Sidelobe Level of a Two-Way Pattern in Shared Aperture Radar Arrays

“…In this paper, an effort is made to minimize the SLL by using the two-weight arrays and searching possible conditions for the two-way array pattern. e reduction of the SLL, depending on the conditions, is better than that of [13] and goes from −47 dB up to less than −50 dB.…”

“…e transmit array has N t elements with array factor AF t while the corresponding receive one has N r elements (N r ≤ N t ) with array factor AF r . e excitation of the above arrays combines the advantages of taper distribution and the simplicity of the feed network of uniform arrays [13]. e two amplitudes of the elements are W 1 and W 2 and their distribution is shown in Figure 1.…”

“…For interelement distance d � λ/2 where kd � (2π/λ) × (λ/2) � π the nulls of AF t are at the angles [13]…”

“…e idea of Haupt [10][11][12] for synthesizing a receive array that places nulls of the receive pattern in the directions of the peak of the sidelobes of the transmit pattern was proved to be extremely useful and successful. In [13], Haupt's idea was extended by equating the level of the first two minor lobes of the two-way radiation pattern. Moreover, to reduce the SLL up to −45 dB, it was proposed in [13] to use two different amplitude weights for the elements of transmit and receive arrays.…”

“…In [13], Haupt's idea was extended by equating the level of the first two minor lobes of the two-way radiation pattern. Moreover, to reduce the SLL up to −45 dB, it was proposed in [13] to use two different amplitude weights for the elements of transmit and receive arrays.…”