scholarly journals Reduction of Orbital Angular Momentum Radio Beam Divergence Using a 3D Printed Planar Graded Index Lenses

2018 ◽  
Author(s):  
B. Allen ◽  
T.D. Drysdale ◽  
S. Zhang ◽  
D. Isakov ◽  
A. Tennant ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Beam Divergence ◽  
Graded Index ◽  
3D Printed

scholarly journals Experimental evaluation of 3D printed spiral phase plates for enabling an orbital angular momentum multiplexed radio system

2019 ◽  
Vol 6 (12) ◽  
pp. 191419 ◽  
Author(s):  
B. Allen ◽  
T. Pelham ◽  
Y. Wu ◽  
T. Drysdale ◽  
D. Isakov ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Communication Link ◽  
Material Interface ◽  
Radio System ◽  
Dielectric Lens ◽  
3D Printed ◽  
Phase Plates ◽  
Spiral Phase ◽  
Additional Loss

This paper evaluates the performance of three-dimensionally (3D) printed spiral phase plates (SPPs) for enabling an orbital angular momentum (OAM) multiplexed radio system. The design and realization of the SPPs by means of additive manufacturing exploiting a high-permittivity material is described. Modes 1 and 2 SPPs are then evaluated at 15 GHz in terms of 3D complex radiation pattern, mode purity and beam collimation by means of a 3D printed dielectric lens. The results with the lens yield a crosstalk of −8 dB for between modes 1 and −1, and −11.4 dB for between modes 2 and −2. We suggest a mode multiplexer architecture that is expected to further reduce the crosstalk for each mode. An additional loss of 4.2 dB is incurred with the SPPs inserted into the communication link, which is undesirable for obtaining reliable LTE-based communications. Thus, we suggest: using lower loss materials, seeking ways to reduce material interface reflections or alternative ways of OAM multiplexing to realize a viable OAM multiplexed radio system.

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