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An analysis and design procedure are presented for a mode transducer which converts the rectangular TE 10 mode into the circular TE 01 mode. The field analysis leads to an explicit evaluation of the transducer's s matrix. An experimental model has been designed using the procedure and the measured performance, 0-2 dB average insertion loss from 33 to 50 GHz, is a significant improvement upon previously reported designs.

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In this work, the mathematical model suitable for the operating principle of the piezoelectric accelerometer is extracted then this model which connects the accuracy and the measurement error according of the frequency ration and the damping rate is validated by simulation. The model developed makes it possible to improve the performances of the accelerometer such as precision, sensitivity and reliability as well as to propose a new conception of the latter. A comparative study is made to show the importance of our results compared to literature, these results have showed that a suitable and appropriate choice of damping ratio develops the accelerometer parameters and enhances the vibratory analysis technique.

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