Radiation from simple and perturbed arbitrarily curved microstrip lines

An arbitrarily curved microstrip line supporting travelling wave type current distribution is analyzed for its radiated far-fields. The curved microstrip line is segmented into multiple linear segments and radiated fields from each of them are calculated through a rectilinear transformation. Finally all such contributions are added up to obtain the total radiated fields. A sinusoidal curve based line is simulated in CST Microwave Studio and simulated results match well with the calculated values. Further, this sinusoidal microstrip line is loaded with two different types of periodic perturbations and changes in radiated far fields in the x-z plane is observed using the arbitrary microstrip line model. Significant amount of beam steering is observed.