Terminator3
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What problems we will see at ~10GHz and higher? In theory it is very tiny area on PCB, less than 10x10mm. Small microstrip distances leads to negligible losses even on worst FR4. So put DR, tune it position until get required peak on spectrum analyzer. How feasible is it? Why I ask this, for example in case of AIA (active integrated antenna), why make two separate boards with interconnections (one for ICs and one for AIA itself), maybe it is good idea to put DRO directly on FR4? No interconnections, no additional assembly technologies, etc. Compact slim design. For some kind wide beam radiating AIA.