| http://www.w3.org/ns/prov#value | - The foregoing components of the filter 32 including the resonators 38, 40, and 42, the sheets 44 and 46 and the ground planes 54 and 56 are enclosed within a housing 64 of electrically conductive material such as copper or aluminum which serves to shield the other components of the circuit 20 from electromagnetic waves within the filter 32, and to prevent leakage of radiated electromagnetic power
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