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