{"title":"Design and Development of Dual Polarized Conjugate Matched Feed for Satellite Communications","authors":"Raksha Ram, Ranajit Dey, Vijay Kumar Singh, Sanjeev Kulshrestha, Milind B. Mahajan","doi":"10.1002/mop.70127","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>Conjugate matched feed supresses secondary cross-pol of offset reflector by utilizing higher order mode (TE<sub>21</sub>) along with fundamental mode (TE<sub>11</sub>) in a circular feed itself. In this paper, physically realizable stable co-axial structure of TE<sub>21</sub> mode coupler and co-axial horn were designed and tested for dual polarization applications. The procedure for designing of co-axial horn for maintaining phase difference between the modes is also discussed. The secondary pattern of the matched feed with offset reflector having F/D of 0.7 and 45° offset angle for dual linear polarization was analyzed using physical optics (PO) in GRASP (Ticra tool). The observation revealed 7 dB improvement in the secondary cross-polar performance for both polarizations using matched feed as compared to TE<sub>11</sub> feed over 7.8% bandwidth. The primary measurement of the feed alone was carried out in an anechoic chamber, and the measured primary pattern was compared with the simulated value. The designed feed could be an alternative of dual reflector antenna used in satellite communications.</p>\n </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 2","pages":""},"PeriodicalIF":1.2000,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Microwave and Optical Technology Letters","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/mop.70127","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
Conjugate matched feed supresses secondary cross-pol of offset reflector by utilizing higher order mode (TE21) along with fundamental mode (TE11) in a circular feed itself. In this paper, physically realizable stable co-axial structure of TE21 mode coupler and co-axial horn were designed and tested for dual polarization applications. The procedure for designing of co-axial horn for maintaining phase difference between the modes is also discussed. The secondary pattern of the matched feed with offset reflector having F/D of 0.7 and 45° offset angle for dual linear polarization was analyzed using physical optics (PO) in GRASP (Ticra tool). The observation revealed 7 dB improvement in the secondary cross-polar performance for both polarizations using matched feed as compared to TE11 feed over 7.8% bandwidth. The primary measurement of the feed alone was carried out in an anechoic chamber, and the measured primary pattern was compared with the simulated value. The designed feed could be an alternative of dual reflector antenna used in satellite communications.
期刊介绍：
Microwave and Optical Technology Letters provides quick publication (3 to 6 month turnaround) of the most recent findings and achievements in high frequency technology, from RF to optical spectrum. The journal publishes original short papers and letters on theoretical, applied, and system results in the following areas.
- RF, Microwave, and Millimeter Waves
- Antennas and Propagation
- Submillimeter-Wave and Infrared Technology
- Optical Engineering
All papers are subject to peer review before publication
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