H - Electricity – 01 – P
Patent
H - Electricity
01
P
333/67
H01P 1/20 (2006.01) H01P 7/00 (2006.01) H03H 9/46 (2006.01)
Patent
CA 1175923
1? Abstract A helical resonator filter comprising two or more helical coils is provided with a conductive coupling element between the helical coils for modifying the filter bandwidth. A coupling element is a conductor and is positioned in the maximum of the electrical field at the open end of the helical coils or at the maximum of the magnetic field at the grounded end of the coils, or both thereby creating controlled change in capacitive (electrical) or inductive (magnetic) coupling, respectively. A block of suitable dielectric with grooves for receiving the coupling element and the ribs on the inside of a conductive cover can be used to center the coupling element and the whole filter assembly structure when the cover is put in place and clamps the block securely to the base of the filter. Additional coupling elements can be used in a similar manner as above when additional helical coils are used in a filter.
397175
Popovski George N.
Vizmuller Peter
Gowling Lafleur Henderson Llp
Motorola Canada Limited
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