Combline filters using conical resonators

This paper describes a novel configuration for combline filters employing conical rods as central conductors in the resonators. With respect to resonators with uniform rods, this shape allows a reduction of the capacitive loading for a given length of the resonator; as a consequence, a larger gap at...

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Bibliographic Details
Main Authors: Macchiarella, G., Santoniccolo, M., Fumagalli, M., Sartorio, A.
Format: Conference Proceeding
Language:English
Subjects:
Conductors
Design methodology
Frequency measurement
Performance evaluation
Power filters
Prototypes
Resonance
Resonator filters
Shape
Testing
Online Access:Request full text
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Summary:This paper describes a novel configuration for combline filters employing conical rods as central conductors in the resonators. With respect to resonators with uniform rods, this shape allows a reduction of the capacitive loading for a given length of the resonator; as a consequence, a larger gap at the rod's end can be employed (it is particularly convenient in high power filters). In this paper a general procedure is presented for analyzing nonuniform resonators under TEM approximation for the fundamental resonant mode; using this procedure, a simple design method for combline filters using non-uniform resonators has been developed. A test filter operating in the frequency hand 824-894 MHz has been designed and fabricated for verifying the novel configuration here introduced; the experimental measurements obtained from this prototype have shown to be in good agreement with the expected performances.
DOI:10.1109/EUMC.2003.1262244