Abstract
This paper presents a design of a four-port, dual-band uniform circular array (UCA) to generate three orthogonal Orbital Angular Momentum (OAM) modes (OAM mode 0, +1 and -1) at two different frequency 2.45 GHz (ISM band/WLAN) and 5.4 GHz (WLAN). The proposed antenna is designed with the help of four 50-Ohm microstrip line radiator (MLR) having an annular slot on the ground plane. The effect of variation of the physical design parameters (like the length of 50-Ohm MLR, the radius of annular slot and annular slot width) on reflection coefficient and the radiation pattern is shown and discussed.
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