Spectral Smoothness of Ground Plane Backed Log-Periodic Dipole Antennas for Radioastronomical Applications

Figure 1

(a) SKALA 4.1 geometry, centrally placed on a 42 m diameter ground plane, which is colored differently at its intersection with the near-to-far field sphere (not at scale); (b) gain at zenith in dBi, radiation by a circular ground plane of infinite and finite radius a = 21 m illuminated by an isotropic spherical wave source at height z = 0.5 m.

(a)

(b)