Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1995-10-10
1997-11-04
Lee, Benny
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333203, 333206, H01P 120
Patent
active
056844395
ABSTRACT:
A ceramic filter (100) with a transmission zero is disclosed. The filter (100) includes a block of dielectric material having top (102), bottom (104), and side surfaces (106, 108, 110 and 112), and having two or more metallized through-holes extending from the top to the bottom surfaces (102, 104), defining approximately half wave long resonators. The surfaces are substantially covered with a conductive material defining a metallized layer, with the exception that the top surface (102) is substantially uncoated, and with the additional exception that the bottom surface (104) is also substantially uncoated defining a filter with an open circuit at both ends. The filter (100) also has an input and an output (118, 120) and a mechanism or slot for electrically isolating successive resonators, extending about halfway between the top (102) and bottom surface (104). A filter constructed as detailed above, can have a higher Q value and lower insertion loss.
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Cunningham Gary J.
Lee Benny
Motorola Inc.
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