Testing the hybrid branch line coupler to see how the PC shop did. FR4 can be unpredictable as a microwave substrate, but this one measures up pretty well against the original prototype. In fact, I was concerned about the repeatability, so I placed compensation pads into the layout. These pads (note the jumpers) on the small vertical traces allow some adjustment for balancing the port-to-port coupling.

These couplers balanced out with one pad on each side jumpered over to the trace.

The chart below shows the measurement results.