In the present contribution results of a simulation of linear-cut Beam Position Monitors (BPMs) based on a design using a metal coated ceramics are compared for two different geometries. The investigated BPMs will be used in the FAIR facility. The simulations were performed using CST Microwave Studio. The main goals of the design optimization were pick-up sensitivity and linearity of the position determination. High position sensitivity can be achieved by reduction of plate-to-plate cross talk caused by coupling capacities. In case of ceramic based BPMs insertion of an additional guard ring into the gap between the active plates leads to an increased sensitivity by about a factor of two.
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