Horn reflector antenna with concentric conical reflectors at mouth to increase effective aperture

Claim 1

IN AN ANTENNA SYSTEM IN COMBINATION WITH A HORN REFLECTOR ANTENNA FOR ELECTROMAGNETIC WAVES HAVING A PREDETERMINED WAVELENGTH, SAID HORN REFLECTOR ANTENNA HAVING A CIRCULAR APERATURE AND PRODUCING A PLANE WAVEFRONT, A FIRST REFLECTOR HAVING A REFLECTIVE SURFACE IN THE SHAPE OF THE INSIDE SURFACE OF A TRUNCATED CIRCULAR CONE, THE TRUNCATED PORTION OF SAID FIRST REFLECTOR ABUTTING THE APERTURE OF SAID HORN REFLECTOR, AND A SECOND REFLECTOR HAVING A REFLECTIVE SURFACE IN THE SHAPE OF THE OUTSIDE SURFACE OF A CIRCULAR CONE, THE AXIS OF SAID FIRST REFLECTOR COINCIDING WITH THE AXIS OF SAID SECOND REFLECTOR, THE APEX ANGLE OF SAID FIRST REFLECTOR BEING EQUAL TO THE APEX ANGLE OF SAID SECOND REFLECTOR, AND THE SPACING BETWEEN SAID FIRST REFLECTOR AND SAID SECOND REFLECTOR BEING AT LEAST SEVERAL OF SAID WAVELENGTHS TO ENSURE THAT TRANSMISSION BETWEEN SAID FIRST REFLECTOR AND SAID SECOND DEFLECTOR TAKES PLACE IN A FREESPACE MODE.