Design of a Catenoidal Shaped Anechoic Termination
Abstract
An analytical model is developed in this thesis to predict the reflection coefficient of an anechoic termination consisting of a catenoidal horn connected to a tube lined with absorbing material. The theoretical predictions are compared to experimental measurements on a prototype. Comparisons are made for a variety of arrangements, including, an open horn, and a horn connected to absorbing terminations of two different lengths. The absorbing terminations are either open or closed to the environment and the analytical model can account for both these scenarios. The results indicate that the new model can accurately predict the reflection coefficient for each case presented, especially at low frequencies and for long absorbing terminations. A comparison with experimentally measured reflection coefficient is made between the analytical model presented in this thesis and the model of Bolton [1] in order to highlight the improvement over existing models.