Patent ID: 8451175

Claim:
An antenna system for frequency division duplex (FDD) based on a composite right and left handed (CRLH) metamaterial (MTM) structure, comprising: a first MTM transmission line comprising a plurality of first CRLH blocks, each first CRLH block comprising at least one first CRLH unit cell, the first MTM transmission line configured to operate as a first transmission line that guides a signal at a first frequency and to operate as a first leaky wave antenna that receives a signal at a second frequency; a second MTM transmission line comprising a plurality of second CRLH blocks, each second CRLH block comprising at least one second CRLH unit cell, the second MTM transmission line configured to operate as a second transmission line that guides a signal at the second frequency and to operate as a second leaky wave antenna that transmits a signal at the first frequency; and a plurality of transistors coupled to the first and second MTM transmission lines, each transistor having a first terminal coupled to the first MTM transmission line and a second terminal coupled to the second MTM transmission line.