Small-Sized Absorbing Elements of Adaptol Attenuators for Surface Mounting

Abstract

Promising topologies, methods of calculation and adjustment of parameters of small-sized absorbing elements of adaptoat-tenuators for surface mounting based on homogeneous and piecewise homogeneous resistive structures providing the implementation of a wide range of attenuations with specified values of input and output resistances are proposed. Topologies based on piecewise homogeneous structures have been studied, allowing not only to reduce the size of the absorbing elements, to ensure high values of the transformation coefficient (more than 200), but also to reduce the maximum values of the potential gradient and power density (on average by 1,5 and 3 times, respectively). The results obtained are especially important for the pulse mode of operation of adaptoattenuators. It is shown that the absorbing elements of the proposed topologies based on homogeneous resistive structures are not able to provide transformation coefficients of more than 3—3,5. The methods of calculation and adjustment of the parameters of absorbing elements, ratios and graphs showing the relationship of attenuation, transformation coefficient, reduction of the maximum values of the potential gradient and power density depending on the ratio of the sizes and resistivity of the resistive films used are given.