Method for transforming bandpass filters to facilitate their production and resulting devices
AssigneeFrance Telecom
InventorsCamille Veyres, Jacques Detaint
Life of this patent
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Abstract
The invention concerns a method for optimizing elements of a narrow or intermediate band bandpass filter whereof the LC prototype has been determined. The invention is characterized in that it comprises steps which consist in: (i) breaking down several parallel or series capacitors of resonators with X elements, (ii) inserting pairs of transformers between the first and second separated element and the rest of the resonator, (iii) displacing the residual transformers to modify the impedance levels of the resonators, and (iv) absorbing the residual transformers by transformation. The invention also concerns the resulting filters.
Claims44
Process for optimisation of the elements of a narrow or intermediate pass band filter for which the LC prototype has been determined, characterised by the fact that it includes the following steps:
- i) decompose resonators with X elements into several parallel or series capacitances
- ii) insert pairs of transformers between the first separate element and the rest of the resonator,
- iii) displace transformers to modify resonator impedance levels, and
- iv) absorb residual transformers by transformation.
Pass band filter obtained by using a process which includes the following steps:
- i) decomposing resonators with X elements into several parallel or series capacitances,
- ii) inserting pairs of transformers between the first separate element and the rest of the resonator,
- iii) displacing transformers to modify resonator impedance levels, and
- iv) absorbing residual transformers by transformation.
Dependencies are inferred from the claim text.