Integrated feeding network for excitation of dual-linear polarization in series-fed antenna lattice

A concept of integrated feeding network designated for excitation of dual-linear polarization in series-fed microstrip antenna lattice has been proposed. The presented feeding network is composed of two Wilkinson power dividers and two 3-dB/90° directional couplers acting as a transmission-line crossover. As it has been shown such a compact network can be easily integrated with the recently developed antenna lattice, and therefore, allows for reduction of dissipation losses in the feeding network. The proposed concept has been experimentally verified by the design of an antenna lattice operating in 5.4 GHz frequency range.