SPECIAL AND LENSED HORN ANTENNAS

Seavey Engineering has delivered hundreds of unique and innovative horn antennas for special requirements. Our computer-aided design tools permit accurate EM modeling of all types of horn throats, flares and lenses. Dual and quad-ridged styles and complex feed arrangements can be analyzed. The following pages reflect only some of the unique horn designs delivered to date.

Lensed Horns

Cylindrical dielectric lenses are added to horn edges to broaden the beamwidth in the plane perpendicular to the lens axis (see Patent 4,065,772). Toroidal-shaped lenses broaden the beam in two planes (see Patent 4,636,798). Zoned plano-convex lenses are applied over short horns to compensate for phase error and to increase gain. Dielectric material on internal flare walls can create moding to shape the beam.

Models 9170-830 &-840 Zoned Plano-convex Lensed Horns

Models 9521-820 &-845 Phase Correcting Lensed Horns

Model 9020-800 38 GHz Lensed Horn Pair

Offset Cylindrical Horn-Parabola This unique antenna uses a 2-dimensional offset parabolic reflector to form a highly directive elevation beam. In azimuth, the beam is formed with a metal flare. With the addition of cylindrical lenses along the vertical aperture edges, azimuth beamwidths of 90° can be achieved. This is an attractive antenna for sectorized base station use. Seavey Engineering has produced these antennas in a wide range of frequencies and beamwidths; dual linear polarization can be used with this design.

Model 9646-810 C-band Offset Cylindrical Parabola

Model Number Frequency GHz Polarization Characteristics 9646-810 3.70 - 4.20 Vertical 500 watts CW, 19 dBi Gain, 35° azimuth, 8° elevation beamwidths, 25.5 inches high, 7.5 inch wide aperature. CMR-229 waveguide port. 9646-820 10.95 - 12.75 Vertical 300 watts CW, 29 dBi gain, 12° azimuth, 3° elevation meamwidths, 25.5 inches high, 7.5 inch wide aperature. WR-75 waveguide port.

Model 9646-820 Ku-band Offset Cylindrical Parabola

Septum Horns Metal septums added in the H-plane of a linear polarized pyramidal horn function as a power divider creating a tapered amplitude distribution in the E-plane. They are a simple way of generating a symmetrical beam with very low sidelobes.	Model 9804-800 L-band Septum Horn
Model Number Frequency GHz Polarization Characteristics 9804-800 1.4 - 1.5 Linear 19.0 dBi gain, 44 inches long, 29 by 31 inches 9634-800 2.9 - 3.5 Linear 15.7 dBi gain, 33.7 inches long, 8.0 by 8.4 inch aperture. beamwidths 31º by 31º. N jack RF port. 9101-800 4.5 - 8.0 Linear 14 dBi gain, 15 inches long, 4 by 6 inch aperture. Beamwidths 48º by 31º. SMA RF port. 9037-800 10.0 - 10.5 Linear 19 dBi gain, 7.5 inches long, 5.5 inch square aperture. Beamwidths 25º by 20º. With window.. HRN9.6X3.8-80/N 8.0 - 12.0 Vertical 19 dBi gain at 8 GHz and 21 dBi gain at 12 GHz. Type "N" female RF input. First Sidelobe  -22 dB by -22+ dB. Beamwidths 8º by 20º. Weight 8lb. HRN3.8X10-80/N 8.0 - 12.0 Horizontal 20 dBi gain at 8 GHz and 22 dBi gain at 12 GHz. Type "N" female RF input. First Sidelobe  -22 dB by -22+ dB. Beamwidths 19º by 9º. Weight 8lb.	Model 9037-800 X-band Septum Horn

Pyramidal and Conical Horns
Simple pyramidal or conical horns are often the low-cost solution to requirements for moderate-gain antennas.

Model 9771-800 2.6 - 2.8 GHz Conical Horn

Model 9462-800 32 - 36 GHz Pyramidal Horn

Asymmetrical-beamwidth, Constant-beamwidth and Shaped-beam Horns
Horns can have asymmetrical beamwidths and controlled radiation characteristics. Short horns with an E-plane amplitude taper exhibit near-constant beamwidths over large frequency ranges. These find use in direction-finding systems where a constant crossover level is desired.

Model 8816-810 Sectoral Horn with Twist Polarizer

Model 9001-800-1 X-band Constant Beamwidth

Model 9749-800 Ku-band Broad Beamwidth

Models 9505-800 &-810 Ku-band Constant Beamwidth

Model 9780-800 39 GHz Sectoral Horn