Compact dual-band rat-race hybrid utilizing composite right/left-handed transmission lines

This paper proposes a compact dual-band rat-race hybrid composed of composite right/left-handed transmission lines (CRLH-TLs). Using CRLH-TLs with phase delays of −270 and −90 degrees at low frequency (f1), and −90 and 90 degrees at high frequency (f2), respectively, relative bandwidths of about 20 % can be obtained at two operating frequencies of 1.0 GHz… CONTINUE READING