12 branches using the WR-137 standard waveguide (inner dimensions 34.85 x 15.80 mm)
The phase shifter is a microwave structure that allows to vary the relative phase between input and output within 0 / 360° with a phase resolution of + / - 1°.
It is based on a 3 dB hybrid coupler with an adjustable moving double short circuit.
The short circuit position is adjusted by a step motor remotely controlled via an electro-optic unit.
This module splits the RF power of each one of the 12 output branches of the final converter in 4, reduced size (28 x 3.6 mm), rectangular waveguides to properly feed the 4 elements in a vertical row of the grill.
It consists in two different groups of two cascaded hybrid couplers to process a couple of standard WR 137 waveguides at a time.
Each output channel is fully monitored in term of direct and reflected RF power by built-in directional couplers
Front and rear view of the distribution module