Grating Lobes Reduction in an Array Antenna Using Curved Disc Monopoles

This paper shows the study of an array antenna with curved disc monopoles whose average spacing between elements is greater than a wavelength l0. The proposed antenna is a linear array, consisting of four equally spaced curved disc monopoles excited by a corporate feed (T-junction power divider). The single element is characterized by a directional radiation pattern in the H plane. Compared to an isotropic monopole antenna array, the proposed array reduces the grating lobes to more than -15dB. As a result, the gain will be increased. The array antenna is fabricated and measured for its impedance and radiation characteristics. The results of the simulation and measurement are in good agreement.