Condition for reducing the beam squint of left-handed leaky wave antennas composed of CRLH transmission lines

Abstract

The unit cell of a composite right-/left-handed (CRLH) rod-shaped leaky wave antenna (LWA) is represented by a lossless T-type circuit, and the circuit parameters that suppress the beam squint with respect to the frequency fluctuation are investigated. As a result, it was found that reducing the right-handed circuit parameter values contributes to suppressing the beam squint. In addition, it was found that the beam squint depends on the ratio of right-handed inductance and left-handed inductance when the CRLH transmission line was formed on the basis of a conventional transmission line, and a ratio condition that minimizes the beam squint was derived.