Arrangement for producing an electric field and sensor device including same
View Patent ↗A circuit arrangement has a field producing electrode device which is connected in an LC network and exposed to a spatial area of the field such that the capacity of the capacitor system with the electrode device alters according to dielectric properties of material present in the spatial area, an insulating layer extending on a rear side of the field electrode device which is oriented away from the spatial area, a screening electrode device which extends on the rear side of the insulating layer which is oriented away from the field electrode device and a field extinction electrode device which has an electrode surface which is oriented towards an extinction area. The field expansion electrode device and the field extinction electrode device are arranged such and impinged upon by a voltage that the spatial area of the field and the extinction area are superimposed on each other in sections.
1. Circuit arrangement comprising:
a field generating electrode device which is incorporated into an LC-network and which comprises an electrode surface area arranged in a first plane and that is exposed toward a field space in such a manner that the capacitance of a condenser system which includes said field generating electrode varies in response of the dielectric properties of material present within said field space,
an insulator layer extending on a rear side opposite said electrode surface area of said field generating electrode device, and facing away from said field space,
a shield electrode device extending on a rear side of said insulating layer and facing away from said field space, wherein the shield electrode device comprises a shield electrode surface area which is arranged in a second plane which is offset from the first plane by means of the insulator layer such that the second plane is not co-planar with the first plane, and
a field extinction electrode device which comprises an electrode surface area arranged within the second plane and facing toward an extinction area, wherein said the field generating electrode device and the field extinction electrode device are arranged in such a manner and subjected to electric voltage that the field space and the extinction space partially overlap each other.
2. Circuit arrangement according to claim 1 wherein the field extinction electrode device is arranged and driven in such a manner that a marginal zone of the field generated by the field generating electrode device and penetrating into the extinction field space is cut.
3. Circuit arrangement according to claim 1 wherein a separation electrode device is provided between the field generating electrode device and the field extinction electrode device.
4. Circuit arrangement according to claim wherein the separation electrode device is arranged between two insulator material layers.
5. Circuit arrangement according to claim 3 wherein the separation electrode device is coupled with the shield electrode device.
6. Circuit arrangement according to claim 4 wherein the separation electrode device is coupled directly with the shield electrode device.
7. Circuit arrangement according to claim 1 wherein a voltage is applied to the field extinction electrode device with a phase-offset and with a higher level with respect to the voltage applied to the field generating electrode device.
8. Circuit arrangement according to claim 7 wherein the phase-offset is substantially π and wherein the voltage has substantially the magnitude of the voltage applied to the field generating electrode.
9. Circuit arrangement according to claim 7 wherein the phase-offset is variable in adjustable manner.
10. Circuit arrangement according to claim 7 wherein a voltage difference between the field generating electrode and the field extinction electrode is variable in an adjustable manner.
11. Circuit arrangement according to claim 1 wherein the separation electrode device extends bar-like between the field generating electrode and the field extinction electrode.
12. Circuit arrangement according to claim 1 wherein the separation electrode device extends beyond the first plane into said field space between the field generating electrode and the field extinction electrode.
13. Circuit arrangement according to claim 12 wherein the separation electrode device is arranged between two insulator material layers.
14. Circuit arrangement according to claim 12 wherein the separation electrode device is coupled with the shield electrode device.
15. Circuit arrangement according to claim 12 wherein the separation electrode device is a vertical extension of the shield electrode device.
16. Circuit arrangement comprising:
a field generating electrode device which is incorporated into an LC-network and which comprises an electrode surface area arranged in a first plane and that is exposed toward a field space in such a manner that the capacitance of a condenser system which includes said field generating electrode varies in response of the dielectric properties of material present within said field space,
an insulator layer extending on a rear side opposite said electrode surface area of said field generating electrode device, and facing away from said field space,
a shield electrode device comprising a first portion extending on a rear side of said insulating layer and facing away from said field space and a second portion extending vertically through said first plane into the field space, wherein a shield electrode surface area of the first portion of the shield electrode device is arranged in a second plane which is offset from the first plane by means of the insulator layer such that the second plane is not co-planar with the first plane, and
a field extinction electrode device which comprises an electrode area arranged within the second plane and facing toward an extinction area, wherein said field generating electrode device and the field extinction electrode device are arranged in such a manner and subjected to electric voltage that the field space and the extinction space partially overlap each other.
17. Circuit arrangement according to claim 16 wherein the field extinction electrode device is arranged and driven in such a manner that a marginal zone of the field generated by the field generating electrode device and penetrating into the extinction field space is cut.
18. Circuit arrangement according to claim 16 wherein the second portion of the shield electrode device is arranged between two insulator material layers.
19. Circuit arrangement according to claim 16 wherein a voltage is applied to the field extinction electrode device with a phase-offset and with a higher level with respect to the voltage applied to the field generating electrode device.
20. Circuit arrangement according to claim 19 wherein the phase-offset is substantially π and wherein the voltage has substantially the magnitude of the voltage applied to the field generating electrode.