The novel circulator includes a substrate, a predetermined number of microstrip lines disposed on a top of the substrate, a ground layer and a predetermined number of {TAIL ~ electrical contacts} disposed on {HEAD ~ the bottom} of the substrate, and a mechanism for coupling each microstrip line to one of the electrical contacts 
The novel circulator includes a substrate , a predetermined number of microstrip lines disposed on a top of the substrate , a ground layer and a predetermined number of { TAIL ~ electrical contacts } disposed on { HEAD ~ the bottom } of the substrate , and a mechanism for coupling each microstrip line to one of the electrical contacts
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