These hybrids use normal FR4 board.
The design published here are on the ‘normal’ FR board. Differences in the board material might effect the results of the design.
Although I didn’t try several boards, the results were usable.
The first design was a simple hybrid as shown here. It was tested at the Leuven Microwave round-table in 2001. Results are published in the bottom table.
The second step was a 4-way splitter. The hybrids used here are the same as above. The 2 hybrids are preceded by a Wilkinson divider. On the Wilkinson divider is a 2W smd resistor (made of 2 x 220 Ohms 1.3W). On the hybrid to ground are 50 Ohms 1.3W resistors.
double hybrid with Wilkinson divider
Single Hybrid test results
Port 1 to 3 loss -3.8dB All VSWRs on all ports OK
Port 1 to 2 loss -3.7dB
Port 1 to 4 loss -3.4dB
Port 2 to 3 loss -3.3dB
Port 2 to 4 loss -3.8dB phase-angle 92 degrees
Port 3 to 4 loss -34dB phase-angle 91 degrees
4-Way hybrid test results
Port in to 1 loss -6.4dB
Port in to 2 loss -6.6dB
Port in to 3 loss -6.8dB
Port in to 4 loss -6.6dB
Port 1 to 2 isolation -18dB phase-angle 86 degrees
Port 1 to 3 isolation -32dB
Port 1 to 4 isolation -32dB
Port 2 to 3 isolation -32dB
Port 2 to 4 isolation -32dB
Port 3 to 4 isolation -17dB phase-angle 94 degrees