Special aspects in interference of in-phase and anti-phase waves with unequal phase velocities in coupled lines under pulse impact

Abstract

We considered the propagation of a short pulse in the picosecond range in coupled lines with a ratio of phase velocities of anti-phase and in-phase waves of 3:1. We showed experimentally a special aspect in the interference of in-phase and anti-phase waves in such structures, which leads to the input pulse separation between three ports without a significant energy loss associated with the reflection from the input. The wave interference was found to lead to a change in the directional properties of the structures under consideration and a separation of the pulse spectral components between the ports.

Coupled Strip Lines with Highly Unbalanced Electromagnetic Coupling and their Use

“…In frequencies up to 4 GHz we can see the presence of resonates, which repeat from the first one to the second after 764 MHz, but from the third one to the fourth already after 884 MHz. The periodicity's disturbance is caused by the synphase and antiphase waves interference particularities, which were studied in article [24]. In this case the phase velocities ratio  , not only a "breakdown" of resonants is possible, but also the fusion of neighboring pass bands.…”

Coupled Strip Lines with Highly Unbalanced Electromagnetic Coupling and their Use

“…In frequencies up to 4 GHz we can see the presence of resonates, which repeat from the first one to the second after 764 MHz, but from the third one to the fourth already after 884 MHz. The periodicity's disturbance is caused by the synphase and antiphase waves interference particularities, which were studied in article [24]. In this case the phase velocities ratio  , not only a "breakdown" of resonants is possible, but also the fusion of neighboring pass bands.…”