METHOD OF DESIGNING MICROSTRIP DIRECTIONAL COUPLERS Russian patent published in 2016 - IPC H01P5/18 

FIELD: physics.

SUBSTANCE: invention relates to microwave equipment and can be used in designing phased antenna arrays, in particular, directional couplers (DC). Implemented is a capacitive connection by including in certain places additional capacitances between the interconnected with microstrip transmission lines ones, which are located on an earthed dielectric substrate. Calculated are optimal characteristics of DC with capacitances by means of scattering matrices at varying geometry of the microstrip lines - the following procedure is introduced: the first stage involves technical simulation, where first in a program package values of the frequency range and parameters of the dielectric substrate are set (dielectric permeability, thickness of the substrate without taking into account losses both in the substrate and in conductors), then the DC configuration is selected including the interconnected microstrip lines with capacitive elements, then set are value of width, length, distance between the lines, the number of capacitive elements (microstrip loop conductors and capacitive communication elements) and their parameters, the device output data is set: minimum (close to one) standing wave ratio (SWR), transient attenuation, isolation, parametric optimization is performed. As per the technical simulation results a DC topological model is obtained with the capacitive elements in the form of microstrip loop conductors and the capacitive communication elements, then at the second stage using the technical simulation results electrodynamic simulation is performed, where by small empirical variations of geometrical parameters the final version of the microstrip DC topology is obtained.

EFFECT: technical result is improvement of the directional coupler pattern in a wide range of its transition attenuations while improving the manufacturability.

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