The circulator also includes a magnet on first surface of the substrate over a resonator circuit connecting the microstrip lines and {HEAD ~ a pole piece} on {TAIL ~ the second surface} of the substrate beneath the ground to provide magnetic bias to the substrate 
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The circulator also includes a magnet on first surface of the substrate over a resonator circuit connecting the microstrip lines and { HEAD ~ a pole piece } on { TAIL ~ the second surface } of the substrate beneath the ground to provide magnetic bias to the substrate
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH