History

The HRS antenna type is said to have originated with RCA as an experimental telecommunications antenna in the late 1920s. Its design was almost immediately adopted by international broadcasters by the mid-1930s, with rotateble versions of the antenna being pioneered by Radio Netherlands at its Huizen transmission site.


The curtain antenna is a dipole array, consisting of rows and columns of dipoles


The fundamental structure of HRS antennas works like this


Curtain antennas are generally available in two sizes


HRS curtain array antenna variations

an HR 2 / 2 / 0.4 model


The number of dipole columns defines the azimuth beamwidth


The mathematical relationship between columns and directivity

 

an HR 2 / 4 / 0.5 model for longer distance communications

The main beam can be slewed by 15° or 30° so that a maximum coverage of 90° can be achieved.



The number of dipole rows and the height of the lowest element above ground determine the elevation angle and consequently the distance of the service area.

a classical HR 4 / 4 / 0.5, for long distance communications