Patent ID: 7598489

Claim:
A system for controlling ion behavior in an ion mobility based analyzer comprising: a flow path for providing a flow of ions, an ion filter for generating an ion filter field in the flow path, the ion filter field for filtering the flow of ions by separating ions in the flow of ions according to species, the separating being based on ion-mobility-based behavior of the ions in the ion filter field, the ion filter including: a substrate, a first insulating layer in communication with a portion of the substrate, a first pair of filter electrodes for generating a first portion of the filter field, the first pair of filter electrodes including first and second filter electrodes, at least one of the first and second filter electrodes being in communication with the first insulating layer, a second pair of filter electrodes for generating a second portion of the filter field, the second pair of filter electrodes including third and fourth filter electrodes, wherein the first and second pair of filter electrodes are biased to provide an influencing electric field to a portion of the flow path to propel the ions along the flow path substantially from the first pair of filter electrodes toward the second pair of filter electrodes.