A device with good negative differential resistance characteristics and a higher resistive cutoff frequency is fabricated using mesa isolation,metal lift-off,wet chemical etch,and air bridge technologies.

Study on cut-off frequency of abnormity wave-guide;

Effect of Co ions substitute on the cut-off frequency of NiZn ferrites;

Optimization design of excitation sources and samples position in computing cut-off frequency of waveguides by 2D-FDTD method;

The results show that one part of residual wavefront phase error changes with cut off frequency proportionally and another part inversely, so it becomes possible to find an optimal frequency which makes the systematic residual wavefront error minimal.

Mechanism of cutoff frequency of resonator tube in thermoacoustic engine;

Study on the influence to the cutoff frequency of semicircle-tunnel from the train;

Effects of the metallic pit prop on the electromagnetic wave cutoff frequency in the rectangular tunnel;