Synthesis of Sparse Uniformly Excited Concentric Ring Arrays Using the Chaos Sparrow Search Algorithm

Table 2

Ring radius and the number of elements in the ring achieved by CSSA.

Aperture ()	and
		1	2	3	4	5	6	7	8
R = 4.98		0.50	1.00	1.50	2.00	2.61	3.34	4.17	4.98
		6	12	18	21	31	37	31	35
R = 4.7		0.59	1.13	1.66	2.26	3.01	3.80	4.70	—
		7	13	19	25	32	29	35	—
R = 4.3		0.50	1.00	1.50	2.00	2.66	3.45	4.30	—
		6	12	16	22	31	28	31	—