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Radiation pattern of dipole antenna on a substrate

Question asked by tabraham on Jan 15, 2007
Latest reply on Oct 3, 2007 by rogero100
I am simulating a microstrip dipole on a substrate fed by differential ports. The radiated power, gain and directivity go to zero for theta=90 degrees, which means that no radiation goes in the substrate direction. Is this correct? The substrate thicnkess is 10 micrometers, the substrate is a dielectric with relative electric permeability 12.9, the dipole length is 160 micrometers and the resonant frequency is about 840GHz.
I thought the thin dielectric substrate should have a minor influence on radiation pattern and it schould be more or less like the radiation pattern in free space which is uniform (for all theta perpendicular to the dipole axis).