In order to construct an Anechoic Chamber satisfying international standards for ENII testing, it has been recogniz ed that the absorption characteristics of the EM wave absorber must be higher than 20dB over the frequency band from 30 MHz to 18 GHz. In this paper, an EM wave absorber with super wide-band frequency characteristics was proposed and designed in order to satisfy the above requirements by using the Equivalent Material Constant Method(EMCM) and Finite Difference Time Domain(FDTD). The proposed absorber is to attach a pyramidal absorber onto a hemisphere-type absorber on a cutting cone-shaped ferrite. As a result, the proposed absorber has absorption characteristics higher than 20dB over the frequency band from 30 MHz to mare than 20 GHz.
1. Introduction
2. General guidelines of an EM wave absorberfor an Anechoic Chamber
3. Design
4. Complex type EM wave absorber
5. Conclusion
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