Microstrip patch based high isolation planar crossover for beamforming applications

In this paper, a microstrip patch is extended to form planar crossover by suitably choosing the feed locations for orthogonal polarizations. The overlap is modified as a hexagonal patch which offers an isolation of −35 dB at 2.4 GHz. Crossover is a part of butler matrix, which is finds applications in beamforming networks. The proposed crossover is compared for reflection and transmission characteristics and compactness with rectangular and circular crossover at same frequency.