The Ultrawideband Elliptical Resistively Loaded Vee Dipole

We present the development of the novel elliptical resistively loaded vee dipole (ERLVD). By replacing the constituent subelements with ellipses, the ERLVD has two degrees of design freedom to achieve increased gain, bandwidth, and decreased size compared with the classical resistively loaded vee dipole (RLVD). The prototyped ERLVD with a unity growth rate experimentally achieved a bandwidth ratio of 13:1 (0.49-6.41 GHz) and a smaller arm length of 0.17 λ
_low
at 490 MHz. This ERLVD has twice larger the bandwidth ratio, 2-3 dB higher gain, and smaller arm size at 490 MHz compared to similar RLVDs. The second ERLVD with a higher growth rate can achieve much higher relative gain increases of 7-8.5 dB with slightly reduced bandwidth.