More information: Rosette Maria Bichara et al, A multi-stable deployable quadrifilar helix antenna with radiation reconfigurability for disaster-prone areas, Nature Communications (2023).

[Mark] had his eyes on the nice quadrifilar helical antenna used by the Vaisla R92 radiosonde’s GPS receiver, with the aim of repurposing them. He had a lot of components to remove while still ...

Figure 12-1: Three radiation modes of a helical antenna The basic concepts of a helix antenna ... However, a helix can be designed with bifilar,4 quadrifilar,5 , 6 or multifilar7 windings. Radiation ...