Theory and Design of Broad-Band Nongrounded Matched Loads for Planar Circuits (Short Paper)

A filter theory approach is used for the synthesis of very broad-band resistive terminations with no direct grounding. The immediate use is in microwave integrated circuits (MIC´s) where no holes or wraparound straps are desirable. Bandwidths achieved amount to 100 and 160 percent for networks of order 2 and 6, respectively. The total circuit lengths are lambda and 3 lambda/2 in these cases. This performance is superior to older designs where only 30-40 percent is obtained.