Jin, C: Double Periodic Composite Right/Left Handed Metamate

Double Periodic Composite Right/Left Handed Metamaterial (DP-CRLH MTM), a new transmission line (TL) double periodically loaded with a pair of alternate capacitances and/or inductances, is introduced in this book. Recently, the concept of CRLH TLs is becoming an interesting topic of research. CRLH TLs are used in practically to compact devices. Most of the well-known CRLH TLs are single periodically loaded with uniform inductance and capacitance, and may be named as single periodic (SP-) CRLH TLs. Because the number of degrees of freedom of the DP-CRLH TLs is doubled, a new branch is obtained in the dispersion diagram. Hence, apart from being expected to radiate in the left-handed region and forward in the right-handed region, DP-CRLH TL is promising a new forward leaky-wave radiation at low frequency below the LH passband. DP-CRLH MTM is an attractive and promising method to compact microwave devices, esperically leaky wave antennas. The new radiation frequency is significantly lower than the LH passband of the SP-CRLH TL with the corresponding similar period. Hence, it is possible to LWAs which are more compact than the one based on SP-CRLH TLs.