Study of protective meander line turn with broad-side coupling

Protection of electronic equipment against ultrashort pulses by meander lines is considered. The results of cross-section parametric optimization and experimental investigations of a meander line turn with broad-side coupling are presented. As the result of the optimization, the set of parameters is obtained for the line per-unit-length modal delays difference maximization with the geometric mean of modes impedances of 50 Ohm. Based on the selected parameters the printed circuit board with meander delay line prototypes of different lengths is manufactured. Then the study of the prototypes in time and frequency domains was executed. The attenuation of the ultrashort pulse with the duration of 40 ps up to 4.2 times is experimentally obtained. It is revealed that the turn passband decreased from 715 to 365 MHz with the turn length increasing from 50 to 100 mm.