Circularly polarised wideband quadrifilar helix antenna with ultra‐wide beamwidth isoflux pattern for a S‐band satellite ground station
| Autor: | Mehdi Taherkhani, Hadi Aliakbarian, Jalaledin Tayebpour, Soheil Radiom |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
business.industry Axial ratio 020208 electrical & electronic engineering 020206 networking & telecommunications 02 engineering and technology Input impedance Radiation pattern Beamwidth Optics 0202 electrical engineering electronic engineering information engineering Wilkinson power divider Helical antenna S band Electrical and Electronic Engineering Wideband business |
| Zdroj: | IET Microwaves, Antennas & Propagation. 13:1699-1704 |
| ISSN: | 1751-8733 |
| DOI: | 10.1049/iet-map.2018.6064 |
| Popis: | A quadrifilar helix antenna (QHA), with an improved isoflux radiation pattern for S-band satellite ground stations, is designed and fabricated. The performance of the antenna with respect to its beam pattern, axial ratio and efficiency is investigated. To have optimum coverage of a low earth orbit satellite rotating the Earth's surface with one fixed pattern ground station antenna, an ultra-wide beamwidth isoflux pattern covering the complete upper hemisphere is required. The presented QHA antenna not only satisfies the required beam shape but also its pattern stays unchanged within a wide bandwidth. Besides that, an efficient Wilkinson power divider as the antenna's feed is designed to match the input impedance of helices appropriately, resulting in efficiency enhancement to >85%. The measured results, which indicate the performances of the proposed antenna in terms of the reflection coefficient, radiation pattern and axial ratio, are in good agreement with the simulation results within 2 to 2.2 GHz frequency band. |
| Databáze: | OpenAIRE |
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