Ahmed Radwan, et al., "Impedance matching through a single passive fractional element." In Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation, 2012, 1.
For the first time, a generalized admittance Smith chart theory is introduced to represent fractional order circuit elements. The principles of fractional order matching circuits are described. We show that for fractional order α <; 1, a single parallel fractional element can match a wider range of load impedances as compared to its series counterpart. Several matching examples demonstrate the versatility of fractional order series and parallel element matching as compared to the conventional approach.
