Experimental investigations on a tapered ferrite rod antenna with magnetic phase control
Experimental investigations were performed on a tapered ferrite rod antenna at 20GHz. By inserting a section of the rod into a solenoid, phase control was achieved by varying the applied DC solenoid current. Phase shifts of greater than 100°/λ0 were attained. The gain and radiation patterns did not change significantly with the applied bias. The return loss was somewhat more sensitive, but a better than 10dB return loss was obtained over the complete bias range.
Petosa, A., Wight, J. S, & Ittipiboon, A. (1994). Experimental investigations on a tapered ferrite rod antenna with magnetic phase control. Electronics Letters, 30(16), 1261–1262. doi:10.1049/el:19940921