Method for designing filter
AssigneeTokyo Electron Limited
InventorsNozomu Nagashima, Naohiko Okunishi, Eiichiro Kikuchi
Life of this patent
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Abstract
A method is provided to design a filter. In the method, a difference between a high frequency to be blocked and a resonance frequency of a distributed constant type reference filter is obtained, the reference filter including a reference coil having windings wound at a plurality of pitches having the same length in an axial direction and a capacitor connected in parallel to the reference coil. When the difference is greater than the predetermined value, a split position in the reference coil where the reference coil is divided into a first coil element and a second coil element connected in series and a split distance between the first coil element and the second coil element to reduce the first difference.
Claims8
A method for designing a filter, comprising:
- obtaining a difference between a high frequency to be blocked and a resonance frequency of a distributed constant type reference filter, which includes a reference coil having windings wound at a plurality of pitches having the same length in an axial direction and a capacitor connected in parallel to the reference coil;
- determining, when the difference is smaller than or equal to a predetermined value, one or more pitches to be changed in length, among the plurality of pitches, to reduce the difference;
- and
- determining, when the difference is greater than the predetermined value, a split position in the reference coil where the reference coil is divided into a first coil element and a second coil element connected in series and a split distance between the first coil element and the second coil element to reduce the difference.
Dependencies are inferred from the claim text.