A Novel Wideband Decoupling Method Based on Even-Odd-Mode Analysis and Genetic Algorithm Optimization

This letter introduces a new approach to designing a wideband decoupling and matching network (DMN) for two-element antenna arrays. The DMN consists of three layers, which can generate three in-band transmission zeros (TZs), resulting in an ultra-wide decoupling bandwidth exceeding 1.0 GHz. The decoupling and matching problems are transformed into two classical impedance matching problems using Even-Odd-Mode theory, which simplifies the network design process. To facilitate the network design, genetic algorithm is used to search for the optimal circuit parameters of DMN. The proposed method is verified using inverted triangular monopoles, and a prototype of the antenna with the proposed DMN is designed, manufactured, and characterized experimentally. Our simulation and experimental results demonstrate that the proposed design can offer ultra-wide operating bandwidth (2.11–3.12 GHz), improved isolation (>20 dB), and high efficiency.