Lu, Liang; Jiao, Yong-Chang; Weng, Zi-Bin; Ni, Tao; Zhang, Chi: 'Bidirectional circularly-polarised loop linear array fed by slotted SIW', Electronics Letters, 2016, 52, (14), p. 1193-1194, DOI: 10.1049/el.2016.1639
IET Digital Library, https://digital-library.theiet.org/;jsessionid=15jaclfp2n86x.x-iet-live-01content/journals/10.1049/el.2016.1639