RD Microwaves specializes in the design and manufacturing of rf/microwave loads intended primarily for low PIM DAS systems and test equipment. In all cases, the terminations are made with long lengths of low PIM cable that provides insertion loss resulting in excellent VSWR/return loss while absorbing the majority of the input power.
The termination is normally supplied with a 50 Ohm impedance cable that is terminated with an open circuit resulting in total reflection at RF frequencies and an “open ‘ at DC.. The typical Return Loss is very high at low MHz frequencies with a good Return Low starting approximately 400 MHz and getting increasing better with increasing frequency. In some cases. These cable terminations are not rated down to DC like resistive types that are also high PIM.
The following table lists terminations that have been provided as both standard and custom made units, with various connector types and conduction, convection, or forced air cooling. Terminations of this type are typically used to terminate the unused ports for hybrid combiners , couplers, antennas, and for mobile and lab test purposes in individual, rack mount, and other packages made to order.