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A study is presented of log-periodic dipole antennas (LPDAs) generalized to have a constant angle twist ψ about the array axis in each period. Simulations show that ψ = 120° can produce circular polarization with good axial ratio, gain bandwidth, and impedance bandwidth, but with fewer elements than a crossed-dipole LPDA.
It is well-known that the conventional log-periodic dipole array (LPDA) has an impulse response with high levels of ringing compared to other antennas, such as ridged horns or Vivaldi antennas, with comparable frequency domain bandwidth. The ridged horn and Vivaldi antennas are known to have transfer functions that are minimum phase if a suitable spatial origin is chosen. In this paper we first show...
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