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Abstract
Microstrip antennas with left-handed materials substrates are studied with method of moments. Discrete complex image method is extended to the computation of Green's function in microstrip circuits with left-handed materials substrates. It's shown that this new kind of antennas will get similar radiation patterns to the ones of conventional right-handed microstrip antennas in some cases; and can yield novel radiation patterns of low elevation angles and low side lobes in other cases. These brand new radiation patterns are hardly achieved by conventional right-handed microstrip antennas.