A novel way of feeding single-layer microstrip patch antennas using electromagnetically coupled microstrip-T junctions is proposed. The measured isolation and 10â€…dB bandwidth of an X-band dual polarised antenna are âˆ¼32â€…dB and 2.1%, respectively, on an Îµr 3.0 substrate. Since both ports of the antenna are electromagnetically coupled, the proposed antenna eliminates the need for capacitors in the RF path for active antenna applications.
Dr. Dhanesh G. Kurup, A. Rydberg, and M. Himdi, “Compact microstrip-T coupled patch antenna for dual polarisation and active antenna applications”, IEEE Electronics Letters, vol. 38, pp. 1240-1241, 2002.