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IEEE/ICACT20220275 Slide.07        [Big Slide]	Oral Presentation
	OAM signal can be generated by spiral phase plates antenna and Uniformed circular array (UCA) antenna, etc. The UCA antenna can generate multiple OAM modes simultaneously in a flexible way and is expected to be used for OAM based wireless communications. To generate the OAM wave, the antenna elements in transmit UCA are fed with the same input signal but different phase shift. By simultaneously emitting radio waves of different OAM modes, many signals can be transmitted at one time without interference.

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