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Originally posted by hawk123
But why do they catch the radio waves with a pyramid antenna?
Is it the same concept as the Pyramid in Egypt?
Figure 7. Impression of single polarisation LOFAR antenna element
To obtain a directional radiation pattern the dipole is combined with a flat metallic reflector. The centre dipole feed point is
positioned about ¼ of a wavelength above the reflector at the highest operation frequency. As a result, at lower frequencies
this distance, expressed in wavelength, is always less then a ¼. In this way a broad directional beam pattern is obtained
which shows no bifurcation over the operational frequency range. Fig. 7 shows a sketch of the LOFAR antenna element.