Interdigitated electrode configuration for ion filter
AssigneeOwlstone Inc.
InventorsMatthew Hart, Andrew Koehl
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Abstract
An ion filter (10) for use in ion mobility spectrometry is described, together with a method for manufacturing the filter. The filter (10) is manufactured by removing portions from a monolithic structure to form a pair of electrodes which remain mechanically connected. The connecting portion (22) provides sufficient electrical impedance between the electrodes to effectively electrically separate the electrodes. The connecting portion may be doped or chemically modified to obtain a desired impedance, or this may be obtained through appropriate selection of physical dimensions.
Claims23
A method of manufacturing an ion filter, the method comprising providing a monolithic structure;
- selectively removing regions of the structure to define separated first and second filter opposing portions and to form a pair of interdigitated electrodes defining at least one ion channel therebetween wherein a first electrode is mechanically connected to and extends from said first filter portion and said interdigitated second electrode is mechanically connected to and extends from said second filter portion such that the first and second interdigitated electrodes extend toward one another from respective opposing said first and second filter portions;
- wherein a connecting portion connects the first and second filter portions of the structure which connection portion provides a higher electrical impedance between the first and second interdigitated electrodes than the filter would provide without such a connection, to thereby electrically separate the electrodes.
An ion filter comprising a monolithic structure defining separated first and second filter portions and a pair of interdigitated first and second electrodes wherein each interdigitated electrode has a planar surface portion defined by an edge surface having at least opposing first and second side surfaces, the monolithic structure further defining at least one ion channel between the first and second electrodes;
- the electrodes further being mechanically connected to the monolithic structure via only a first side portion of each first and second electrode wherein a connecting portion connects the first and second filter portions of the structure which connecting portion provides a higher electrical impedance between the first and second electrodes than the filter would provide without such a connection, to thereby electrically separate the electrodes.
Dependencies are inferred from the claim text.