SHIELDED SLOT LINE Russian patent published in 1997 - IPC

FIELD: microwave engineering. SUBSTANCE: line has metal conductors separated by slot and placed in closed shield, periodic slow-wave structure in the form of crimp with transverse depressions placed on one of shield walls facing the slot; according to invention, cross-sectional area is twice as small as line size at which quasi-H₁₀ waves easily propagate; depressions in crimp are much smaller than length of wave propagating in line and clearance between crimp and conductors is between 0.5 and 2 of crimp depth. Reducing cross-sectional area of slot line increases critical frequency of volume quasi-H₁₀ wave and closer distance between slot and crimp with small depressions facilitates propagation of surface wave in slot line at frequency lower than critical frequency of quasi-H₁₀ wave. EFFECT: improved noise immunity of line due to reducing frequency band of electromagnetic wave propagation to working frequency band. 2 dwg