Dispersionless phase responses of pseudoperiodic metamaterials based on CRLH transmission lines

In this paper, it is shown that reflectivity of a CRLH TL can be completely dispersionless, which means phase responses independent of frequencies. Especially, pseudoperiodic configuration of CRLH transmission lines, proposed in this paper, makes dipersionless responses even in much smaller designs. If the phase of reflectivity (S11) observed at a certain point does not depend on frequency, the input impedance seen from the point also does not, leading to broadband impedance matching. The above electromagnetic property is expected to have effective applications such as microstrip filters, feed networks for antennas.