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