XMobots (Brazil)

ABSTRACTThis paper describes the design of a new compact circuit for Butler Matrix using few lumped elements to operate at 2.4 GHz. It is demonstrated that acceptable performance could be only achieved by proper electromagnetic modeling of the lumped components using metallic pads and resistor, inductor, and/or capacitor surfaces in Ansys HFSS, to allow compensating for parasitic and coupling effects. The input selection of the proposed architecture is realized digitally using an absorptive switch. The designed circuit has been used to feed a microstrip antenna array to demonstrate the beam switching capability. Very good agreement between the expected and measured results has been verified.