Experimental investigations on a tapered ferrite rod antenna with magnetic phase control

Experimental investigations were performed on a tapered ferrite rod antenna at 20 GHz. 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 10 dB return loss was obtained over the complete bias range