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Capacitive air ultrasonic transducers with uniformly V-grooved backplates have been studied. It was found out that the variation of 18% in the electrostatic excitation force profile is converted down into 1% to the side of the mechanical bending profile of the membrane over the V-groove. Therefore a modified electric field can be used to analyse the membrane-V-groove resonator. The treatment results in a relatively simple analytical equation which can be used to guide the design process of the transducer.