Systematic Method to Design Filtering Patch Antennas

We introduce a novel low-profile filtering patch antenna and a method to design it. A single radiating patch is divided into several interconnected elements with each element having a connection to the antenna ground plane as well. The antenna structure is first modeled as a multi-port element and then reduced to a single-feed antenna. In practice, the interconnections between the elements are implemented with discretized components, such as lumped elements and open/short connections. One element acts as an exciter while the remaining elements are loaded reactively. The appropriate reactive loads are found by using a genetic algorithm. The method is demonstrated by designing a patch antenna having a reasonable bandwidth and filtering characteristics, both of which are comparable to other works.