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Simulation of a Cassegrain Reflector Antenna to Improve Gain Uniformity among Orbital Angular Momentum Modes
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- Authors
- Lee Wangjoo, Hong Ju Yeon, Kang Min-Soo, Kim Bong-Su, Byun Woo-Jin, Song Myung Sun, Kim Kwang Seon
- Issue Date
- 2017-06
- Citation
- International Symposium on Microwave and Optical Technology (ISMOT) 2017, pp.1-4
- Language
- English
- Type
- Conference Paper
- Abstract
- Multiplexed microwave orbital angular momentum (OAM) modes can be generated by feeding circularly distributed uniform array antennas and transmitted by a single high gain Cassegrain antenna. But for a conventional Cassegrain antenna the aperture of feeding antennas match with the focus of sub-reflector only for zero OAM mode and non-zero OAM modes suffer from not only larger free space loss caused by Laguerre–Gaussian field distribution but also lower antenna gain caused by focus mismatching. So the received power difference between zero and non-zero OAM modes grows immensely with transmission distance which becomes the main limiting factor of OAM mode communication distance. To mitigate the received power difference we axially shifted the focal point of sub-reflector to lower the zero OAM mode gain and to improve the non-zero OAM mode gain. The simulated main lobe directivity difference of 0 mode and 1 mode showed 6.1 dB mitigation for the axially shifted sub-reflector Cassegrain antenna compared to the conventional Cassegrain antenna.
- KSP Keywords
- Antenna gain, Array antenna, Cassegrain antenna, Cassegrain reflector, Field distribution, Free space loss, Gain uniformity, Gaussian field, High Gain, Limiting factor, OAM modes