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In this paper, the authors propose a two-dimensional, wide dynamic range,linear displacement sensor using microwave methods. The microwave sensorcircuit employs a cylindrical dielectric resonator proximity coupled to a pairof orthogonal microstrip lines formed on a microwave substrate. The DR rests onthe substrate and is free to be displaced between the strips on the 2D plane ofthe substrate. The strips excite the particular resonant mode of the DR, theintensity of which varies with the DRs proximity to the strips. The DRsposition can thus be read out in terms of the 2 port S parameters of thecircuit, at a fixed frequency determined by the resonant mode of DR. Such fixedfrequency sensors are robust in operation and cost effective in realization, animportant aspect of this sensor. Initial one-dimensional positioningsimulations of the sensor through three fixed representative paths on thesubstrate reveal that the S parameters vary monotonically with thedisplacement. Prototype measurements reveal a dynamic range of 23 mm forhorizontal or vertical displacement, and 30 mm for diagonal displacement at theresonant frequency of 3.67 GHz. Next, 2D positioning test is conducted and atechnique for one to one mapping from the S parameters to the 2D position isdemonstrated. To conclude, the proposed sensors performance is compared withthat of existing 2D sensors.

Two-Dimensional Wide Dynamic Range Displacement Sensor using Dielectric Resonator Coupled Microwave Circuit