Design and Implementation of DC–20-GHz Lumped Resistor Matched Loads for Planar Microwave Circuits

In this paper, a design technique to match lumped resistors in the dc to 20-GHz band is presented. This technique makes it possible to implement very wideband matched loads with a return loss that is better than 20 dB. The proposed implementation is simple, low cost, and gives superior performance than previously reported alternatives. The technique was developed to match surface-mount resistors soldered on plastic substrates, and was then successfully applied to match trimmed printed resistors on low-temperature co-fired ceramic substrates.