The composite right/left hartded(CRLH)trangnission-line structure is a sort of metamaterial realized by circuits
which can provide some new characteristics.Meanwhile the substrate integrated waveguide(SIW) is a new transmission Wte with high Q-factor and low interference
which has attractive applications in millirrteter waves.In this paper
we present a new stnrcttue which combines tvRLH and SIW together.Using such a stmcnue
we study the rrali7ation of compact frequency-sweeping antennas.Full-wave simulation results show the validity of the proposed antennas.