A high frequency semiconductor device contains {HEAD ~ a semiconductor element} in {TAIL ~ a cavity} formed by a dielectric board and a cap 
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A high frequency semiconductor device contains { HEAD ~ a semiconductor element } in { TAIL ~ a cavity } formed by a dielectric board and a cap
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH