Minimum Versus Nonminimum Scattering Antennas

The classical definition of a minimum scattering antenna (MSA) is one that  

Scatters as much total power as it absorbs for conjugate match. 

Radiates the same fields in the forward and backward directions. 

Consequence Only 6-dB reduction in RCS for conjugate match, see Example I above. 

This definition has been known at least since World War II [55] and has been widely quoted eversince [37, 38, 56-58]. What is more, it has often been implied that this class of antenna represents the ultimate as far as low radar cross section is concerned and, consequently, should be treated with great respect  

---