Design of low reflection coefficient printed antennas

In this paper a design strategy is presented to achieve low reflection coefficients (<; - 40 dB) for printed antennas over reasonable bandwidths (> 10 %) without the need for external matching structures. The design strategy revolves around critical coupling between multiple resonances within the radiating structure. The strategy is applied to aperture stacked patches and can be applied to other forms of antennas. The theoretical results are validated through experiment.