The design method of the coaxial cavity EMI filter which is used in high frequency is stressed.

The approximate calculation formula for measuring permittivity by the per-turbation method of λ/4 coaxial cavity is deduced, to give an account of the experimental waysfor measuring the values of frequency shift of perturbation cavities with a variety of dielectric per-mittivity and thickness.

In order to develop high power Terahertz sources,a large radius coaxial cavity gyrotron has been studied in this paper.

The coaxial-cavity is one of the hopeful method raising the electronics efficiency at present, joining the inside conductor axle in the cylinder cavity makes the pattern register nearby work pattern becomes rare and to be of advantage of the model selection, restrain the model competition and recovery electron beam to step-down easily.

By use of coupling matrix in pectination form,a combline coaxial-cavity filter with λg/4-type SIR is designed.

A design of the coaxial resonator duplexer is introduced based on the design of the general Chebyshev band-pass filter with two finite transmission zeros.

The coaxial resonant cavity with a capacitance load has been interested by more and more researcher, because of its special and collect electromagnetic characteristic.

The microwave amplitude equalizer is composed of several interconnected substructures,every one of which is the λ/4 absorptive coaxial cavity resonator.