On the potential of graded-chiral Dallenbach absorbers

In this contribution, the potential of graded-chiral/dielectric absorbers i s explored theoretically. To this end, two different design procedures are introduced that allow its to improve single-layer and graded-dielectric Dal lenbach absorbers. Both design concepts finally lead to graded-chiral/diele ctric Dallenbach absorbers. The first experiments prove the concept. and al low its to identify and discuss the effects and problems associated with th e practical realization. (C) 2001 John Wiley & Sons, Inc.