Numerical analysis of a grid array antenna printed on a dielectric substrate fed by a coaxial line

The radiation characteristics for a grid array antenna printed on a dielectric substrate (PGAA) excited in unbalanced mode (UnBal-PGAA) are analyzed using an integral equation with the method of moments (MoM). The UnBal-PGAA radiates a linearly polarized beam in the broadside direction. It is found that a difference in the excitation modes (balance and unbalance) does not affect remarkably the half-power beam-width and the frequency bandwidth of the gain.