Substrate integrated focused multibeam antenna based on the modified Rotman lens

In this paper, a modified substrate integrated waveguide (SIW) Rotman lens is proposed to feed several SIW slot array antennas in order to generate multiple focal points. This modified SIW Rotman lens, as a focused beamforming network (BFN), consists of eleven input beam ports and fifteen output array ports. Its phase shifting network is modified to satisfy the requirements of beam focusing and scanning. The focal point of the integrated multibeam antenna can be changed when it is excited at different input port.

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