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Revankar, UK and Kumar, A (1992) Broadband stacked three-layer circular microstrip antenna arrays. In: Electronics Letters, 28 (21). pp. 1995-1997.
Revankar , UK and Kumar, A (1991) Experimental investigation of three-layer electromagnetically coupled circular microstrip antennas. In: Electronics Letters, 27 (13). 1187-1189 .