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Circularly‐polarized cavity‐backed slot antenna array with simplified feeding structure
Author(s) -
Chen RuiSen,
Zhu Lei,
Wong SaiWai,
Yu XuZhou,
Lin JingYu,
Li Yin,
He Yejun
Publication year - 2021
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.22859
Subject(s) - antenna array , optics , antenna efficiency , array data structure , physics , antenna aperture , slot antenna , antenna (radio) , radiation pattern , optoelectronics , engineering , electrical engineering
A class of circularly‐polarized cavity‐backed slot antenna arrays with simplified feeding structure are proposed. Power dividing network is an essential feeding structure for the design of conventional antenna arrays, which results in complicated antenna structure. A novel feeding technique based on the electric field of cavity modes is introduced to feed the array elements. The slots on the top wall are directly fed by the electric field without additional feeding structure. Crossed slots with different lengths are introduced to achieve the self‐phased CP radiation as they produce different perturbation on the two degenerate cavity modes. Therefore, high efficiency and simple antenna structure of the CP slot antenna array are achieved. Then, two CP slot arrays with 3 × 3 and 8 × 8 elements are presented to show the designed feasibility. Finally, the 3 × 3 CP antenna array is fabricated and measured to validate the design concept, which can achieve 12.6 dBic gain, 94% total efficiency, 80% aperture efficiency, and −25 dB cross polarization.