Dual Circularly Polarized All-Metal Orbital Angular Momentum Beam Reflectarray Antenna

Ahmed, Zubair; Muhammad, Awab; Kausar, Shafaq; Ihsan, Mojeeb Bin

doi:10.1109/ap-s/usnc-ursi47032.2022.9886105

Cited by 1 publication

(2 citation statements)

References 4 publications

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“…In CA [9][10][11][12][13][14][15][16], the position of the approximate phase center of the feed is first fixed through simulation or measurement, and the illumination phases on the RA aperture are calculated according to the spatial phase delay from the phase center position to the element position. The pencil-beam phase distribution φ CA PB (x, y) is then determined based on the antenna array theory:…”

Section: Camentioning

confidence: 99%

“…Circular polarizations (CP) have the advantages of anti-polarization mismatch, anti-multipath, and are less affected by Faraday rotation. There are many approaches for designing circularly polarized OAM (CP-OAM) RA/TAs [12][13][14], among which the approach of adopting circular-polarized feed can significantly simplify the design of RA/TA elements [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Two Approaches for Designing Circularly Polarized OAM Reflectarrays

Ding,

Zhang,

Zhao

2024

PIER M

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By calculating the compensation phase distribution from the radiation fields of the feed, two approaches are proposed for reflectarrays (RAs) generating circularly polarized orbital angular momentum (CP-OAM) beams with higher mode purity. Particularly, if the radiation fields are extracted in spherical coordinates rather than Cartesian coordinates, the required phase distribution for generating a CP-OAM beam of +1/−1 mode can be directly obtained according to our mathematical derivation which shows that the spherical components of left-/right-hand circularly polarized (LHCP/RHCP) fields naturally involve the OAM phase term of +1/−1 mode. To better demonstrate our work, CP-OAM RAs with either smooth horn or corrugated horn of RHCP as feed are designed by three approaches: the conventional approach (CA) based on the estimated phase center, and two proposed approaches based on simulated radiation fields in Cartesian coordinates (CCA) and spherical coordinates (SCA), respectively. Full-wave simulation results show that the OAM mode purity can be enhanced by either CCA or SCA, and the SCA can produce even higher mode purities than CCA when an offset feed is employed.

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