(57) A waveguide manifold (200) for monitoring the operation of an array antenna (1).
The waveguide is centerfed (203) and has reflecting terminations (201, 202) at either
end. The waveguide output is matched to the waveguide as if non-reflecting terminations
were at either end of the waveguide. The waveguide input is a plurality of groups
of slots (206-214) wherein adjacent slots in each group (A, B, C, D) have alternating
polarity and adjacent groups may have alternating phase. A standing wave created in
the waveguide has a plurality of cells of alternating phase (Fig. 11). Each slot is
located within one of the resonating standing wave cells. The resulting manifold beam
forming characteristic will be temperature and frequency independent over a practical
range.
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