Ceramic Microwave Absorber

Furthermore only less than 10 microwave is reflected and more than 90 is attenuated when the rc value is less than 10 db.

Ceramic microwave absorber.

The absorber inserted into the cavity is designed to attenuate the resonance peaks by changing the characteristics of the cavity and the phase of the reflected signal moreover being made up of carbon it will tend to deteriorate the q of the cavity in order to decrease the self oscillations in resonance peaks. I free space broadband absorber or impedance matching absorber or graded interface absorber e g. Microwave absorbers with layered structures that can provide abundant interfaces are highly desirable for enhancing electromagnetic absorbing capability and decreasing the thickness. The atomically thin layers of two dimensional 2d transition metal carbides mxenes make them a convenient precursor for synthesis of other 2d and layered structures.

Although the flat faced design makes this absorber flexible lightweight and inexpensive performance is limited to 20db because of the higher front face reflections. Nauka 1982 164 pages illustrated. Yefremova et al volumetric absorbers for high power twts elektrotekhnika 1970 issue 11 microwave electronics pages 95 102. Cuming microwave has a full line of microwave absorber radar absorber anechoic chamber and dielectric materials.

Some experience is accumulated in the area of applying microwave absorbing ceramics made of aluminium oxide and titanium dioxide. 0 25 inch absorber works from 18ghz up while 9 0 inch absorber works from 400mhz up. The microwave absorption property and bandwidth could be tuned by controlling the cobalt content and annealing temperature of ceramics. The microwave absorber may be classified into two broad category.

Our absorbers have been used in many demanding applications from suppression of unwanted resonances in electronic housings to radar cross section reduction on military platforms. Pyramidal absorber 13 foam. Flat absorber provides approximately 20db of absorption over the design range which is dependent on thickness. When the average real permittivity imaginary permittivity and loss tangent of materials increased to 8 06 3 10 and 0 39 the reflection coefficient rc value of as synthesized ceramics was lower than 10 db almost across the whole x band 8 46 12 4 ghz.

The microwave absorption capability of the porous sioc ceramic reaches the rc min which is about 39 13 db at 11 76 ghz with the thickness of 3 0 mm. A jauman type microwave absorbing ceramic was prepared by adding carbon felt film in a ceramic matrix from the mixture of quartz calcium sulphate talc and sodium tetraborate.