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We present a novel way to generate waves bearing Orbital Angular Momentum (OAM) in a circular waveguide by using two monopole antennas. The OAM mode ℓ = 1 is generated by a combination of the classical TM01 and TE21 modes of the circular waveguide. Two printed monopole antennas are used to create these two modes. The design procedure of this novel “OAM antenna” is presented. The resulting electrical...
The circular phased antenna array is a common way to generate waves bearing Orbital Angular Momentum (OAM) in the radio frequency band, but the directivity of this antenna is relatively low. To overcome this drawback, in this paper, we use a Fabry-Perot cavity to enhance the directivity of an OAM antenna based on a circular phased array of patch antennas. The Fabry-Perot cavity consists of a ground...
We present a novel way to generate radio waves bearing Orbital Angular Momentum (OAM) in the horn antenna by using a circular metallic waveguide. The OAM mode ℓ = 1 is generated by combination of two TE21 modes inside a circular metallic waveguide. The resulting electrical field distribution and the radiation patterns evidence the properties of waves carrying OAM. The influences of the horn structure...
We present a novel horn antenna to generate radio waves bearing Orbital Angular Momentum (OAM) by using a circular waveguide. The OAM mode ℓ = 1 is generated by using a spiral phase plate (SPP) inside a circular waveguide. We present here two methods to transform the classical guided modes to OAM wave. The resulting electrical field distribution and the radiation patterns evidence the properties of...
Orbital angular momentum (OAM) has been proposed to improve spectral efficiency [1] [2] [3] in radio, by creating multiple sub-channels of communications corresponding to the twisting degree of the electromagnetic (EM) wave. Whereas the phase of a usual plane wave is constant on the wavefront, the phase α of OAM waves undergoes a linear variation along the angular coordinate φ (roll angle): α = ℓ...
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