Ce. Saavedra et al., A MILLIMETER-WAVE QUASI-OPTICAL AMPLIFIER ARRAY USING INCLINED-PLANE HORN ANTENNAS, IEEE microwave and guided wave letters, 8(2), 1998, pp. 81-83
A novel millimeter-wave quasi-optical amplifier array architecture is
presented, The amplifier array consists of a horn antenna that tapers
down to a parallel-plate waveguide, Stacked between the parallel-plate
s is a microstrip power divider circuit which feeds the active element
s, At the output there is a similar power-combining circuit and transi
tion to free space, Measurements on the active array show a maximum ga
in of 7.25 dB at 43.25 GHz and a bandwidth of 5.75 GHz.