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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, High Gain Antenna(HGA), Mode number, OAM modes, OAM wave, Phase distribution, Reflectarray antenna, Reflection bandwidth, dual-reflectarray
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
