  In this letter, we present a novel four-way divider/combiner in rectangular
waveguide. The design is completely two-dimensional in the h-plane, with
eight-fold mirror symmetry, and is based on a recent four-port hybrid design
[6]. In combining mode, it can function as a phased array with four inputs and
four outputs. The planar nature of this design provides advantages, such as the
freedom to increase the waveguide height beyond the over-moding limit in order
to reduce field strengths. Along with its open geometry, this makes it ideal
for high-power applications where rf break down is a concern. Design criteria,
field-solver simulation results, and prototype measurements are presented.
