W-band series-connected patches antenna for multibeam application based on SIW Butler matrix

This letter presents a series-connected patches antenna aperture-coupled by substrate integrated waveguide (SIW), which produces narrowed E-plane beamwidth for improving antenna gain. With this special patch array, W-band multibeam array antenna capable of offering switchable beams in H-plane is designed by means of SIW Butler matrix. The simulation and experiment results show good impedance matching and port-to-port isolation, as well as specific beams associating with different antenna ports, well demonstrating the validity of this design. Additionally, the antenna is developed by printed circuit board (PCB) technology, characterizing of planar profile, high-level integration, low cost and small weight.