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Journal Article
Orbital Angular Momentum (OAM) Antennas via Mode Combining and Canceling in Near-field
- Authors
- Woo Jin Byun, Hyung Do Choi, Yong Heui Cho
- Issue Date
- 2017-10
- Citation
- Scientific Reports, v.7, pp.1-9
- ISSN
- 2045-2322
- Publisher
- Nature Publishing Group
- Language
- English
- Type
- Journal Article
- Abstract
- Orbital angular momentum (OAM) mode combining and canceling in the near-field was investigated using a Cassegrain dual-reflectarray antenna composed of multiple microstrip patches on the main and sub-reflectarrays. Microstrip patches on dielectric substrates were designed to radiate the particular OAM modes for arithmetic mode combining, where two OAM wave-generating reflectarrays are very closely placed in the near-field. We conducted near-field antenna measurements at 18 [GHz] by manually replacing the sub-reflectarray substrates with different OAM mode numbers of 0, 짹1, when the OAM mode number of the main reflectarray was fixed to +1. We subsequently checked the azimuthal phase distributions of the reflected total electromagnetic waves in the near-field, and verified that the OAM waves mutually reflected from the main and sub-reflectarrays are added or subtracted to each other according to their OAM mode numbers. Based on our proposal, an OAM mode-canceling reflectarray antenna was designed, and the following measurements indicate that the antenna has a better reflection bandwidth and antenna gain than a conventional reflectarray antenna. The concept of OAM mode canceling in the near-field can contribute widely to a new type of low-profile, broad-reflection bandwidth, and high-gain antenna.
- KSP Keywords
- Antenna gain, Dielectric substrate, Electromagnetic waves(EM), High Gain Antenna(HGA), Mode number, OAM modes, OAM wave, Orbital Angular Momentum, Phase distribution, Reflectarray antenna, Reflection bandwidth
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
