This is not a new invention. It's just a hack together of some (very) nice parts. And the result is an 'even nicer' part. (So we think :-)

This design uses two times an TCD-17-282X+ from Mini Circuits. A small printed circuit board was designed to offer adequate 50 Ω traces, as it should go up to 3000 MHz. The termination is done by two resistors 0805, 49.9 Ω. We used sma connectors to keep the geometry small. The case was milled from aluminium. Surface coated with nickel. As connectors, you mayst use MC000242 (Multicomp) or 142-0701-411 (JOHNSON).

Figure 1. Coupling (INPUT - INCIDENT) or (OUTPUT - REFLECTED)



Figure 2. Main Line Loss (INPUT - OUTPUT)



Figure 3. Directivity

Note : The directivity is the difference in dB of the power output of the two coupled ports, when power is transmitted in a constant direction on the main-line.

All measurements done with an hp 8753 ES. Looks like this is a candidate for VHF (< 299 MHz) measurements only.

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