Liao, X.-J.; Yang, H.-C.; Han, N.; Li, Y.: 'UWB antenna with dual narrow band notches for lower and upper WLAN bands', Electronics Letters, 2010, 46, (24), p. 1593-1594, DOI: 10.1049/el.2010.1943
IET Digital Library, https://digital-library.theiet.org/;jsessionid=31bkge1npfbe7.x-iet-live-01content/journals/10.1049/el.2010.1943