Linearly Polarized Radial Line Patch Antenna With Internal Rectangular Coupling Patches

A linearly polarized radial line patch antenna with internal coupling patches is presented. A non-resonant antenna structure has been designed, with a 0.68 λ₀ radial spacing between element rings. A uniform amplitude and phase feed scheme has been implemented. Therefore, a phase compensation microstrip structure (external to the radial waveguide) has been included for a broadside radiation beam. Likewise, a compensation method has been used to avoid internal reflection problems in the waveguide. An antenna prototype has been built. 28.2 dBi gain and 70% efficiency peak values have been measured at DBS band, with reasonable agreement between simulations and measurements.