A broadband multilayer radar absorbing coating (RAC) operating within the frequency range of 7–12 GHz was designed and fabricated for the purpose of a radar cross section (RCS) reduction of complex naval targets. The proposed RAC consists of three layers: a shop primer, a main absorbing material, and an epoxy resin paint. To validate the effect of a RCS reduction, the proposed RAC was applied to the life‐size mock‐ups of a periscope and snorkel of a representative submarine type. The RCSs of the two mock‐ups with and without the RAC applied were measured, and the results compared with the simulations. The experimental results demonstrate that the proposed RAC guarantees an RCS reduction of 10–15 dB from 7 to 12 GHz. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1907–1910, 2014

No abstract

It is being examined that 2.3GHz frequency band is withdrawn and redistributed at the same new service for efficient use of the radio resource in the South Korea. In lhis paper, analysis o i 2.3GHz band propagation path loss characteristics by investigating the raw data gathered from the practical measurement is presented. Also we have performed field measurement in the frequency band over several types of building to obtain the penetration loss and diffraction loss. 2.3GHzband propagation characteristics(path loss, diffraction loss, and penetration lass) and corrected theoretical model for path loss prediction which was presented will be nseinl to the application such as prediction of path loss in the consideration of domestic environment, cell planning and optimizalion for new service systems.