#### Scalar Horn Radiator

Figure 1: AN 20D scalar horn for 3,7 ... 6 GHz and a feeding via a coaxial SMA-jack

#### Scalar Horn Radiator

Scalar horn radiators in a broad form have an almost constant and uniform beamwidth both in E- (electric) and in H- (magnetic) field. The beamwidth can take values between 20° und 70°. Special features of this antenna are the low sidelobes and the low internal losses.

The narrow form (see the picture) causes a frequency dependent and also in E and H field uniform beamwidth. The frequency range of this antenna is an octave. The narrow scalar horns can be designed with a beamwidth of 7° to 40°.

One can use these horn radiators for all kinds of polarisation on reason of its circular symmetry.