The BAL-0067 are integrated power divider-inverter baluns. This means they have a Wilkinson power divider on the common port, an inverter before the negative port, and a matched delay line on the positive port.
The CE20-0240 is a next generation broadband 2GHz to 40GHz, 20dB directional coupler from the Marki Elite Series. Conductive paint is applied to all Elite Series products to reduce EMI/RFI leakage and susceptibility.
The characterization of microwave networks requires discriminating between forward and backward traveling waves. Unfortunately no directional device is perfect, leading to potentially dramatic measurement errors. In this note we show that return loss and VSWR measurements are greatly complicated by the finite performance of the directional device used to measure the reflected power.