This work outlines a methodology for designing feed networks for single and dual-polarized
aperture-coupled microstrip patch (ACMP) antennas with dual-offset microstrip feedlines. The challenge to be addressed is matching the antenna effective impedance to the feedline, which is an area with limited literature. This study demonstrated that ACMP antennas can be coupled to dual-offset feedlines with λ/4 transformers and T-junctions with infinite combinations of impedance for the λ/4 transformer. Equations were developed to relate the effective impedance to the feed geometry, allowing the design of the patch antenna’s feedlines. Using this approach, two 10 GHz ACMP antennas, with single and dual-polarization, were designed and implemented obtaining satisfactory excellent impedance matching and isolation and cross-polarization level.