LP radiation from a metamaterial-based loop antenna

A loop antenna whose electrical peripheral length is equal to two (C_peri = 2) at two different frequencies is investigated. The antenna arm of this loop is composed of numerous cells, each having one inductive and two capacitive elements, so that the current on the loop has a negative propagation phase constant in addition to its inherent positive propagation phase constant. The radiation pattern shows a dual-peak pattern. The VSWR is small at the two frequencies where C_peri = 2, as desired.