helix (SH), spherical meanderline (SM), and a hybrid design-are explored through both
simulation and measurement. We show that the SH is efficient, but can be difficult to
impedance match without external components. On the other hand, the SM antenna has a
widely controllable impedance with slightly increased loss. Thus, a hybrid design is
proposed that retains the desirable qualities of both the SH and SM. All three designs are …