Radiation Pattern Reshaping of a Narrow Slot Antenna for Bandwidth Enhancement and Stable Pattern Using Characteristic Modes Analysis
| Autor: | Ying Liu, Neng-Wu Liu, Guang Fu, Lei Zhu, Zhong-Xun Liu |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | IEEE Transactions on Antennas and Propagation. 70:726-731 |
| ISSN: | 1558-2221 0018-926X |
| Popis: | A novel design concept to reshape radiated fields of a slot antenna for improved bandwidth and stable radiation pattern is proposed. Initially, the radiated fields of the traditional slot antenna are theoretically studied using characteristic modes (CMs). The results demonstrate that its CM1, CM2, and CM3 are resonated of around 2.39, 4.78, and 7.17 GHz, respectively. For CM1 and CM3, both of them maintain the bidirectional radiation patterns. Whereas, the CM2 generates a radiation null in the broadside direction. Then, in order to utilize the nearby CM1 and CM2 for wide-bandwidth, the linear slot is properly folded so as to transform the non-bidirectional pattern of CM2 into the bidirectional one. After that, the narrow slot is reformed as the stepped scheme, thus reallocating these dual modes in proximity to each other. With these arrangements, the impedance bandwidth of the antenna is dramatically widened with two attenuation poles, while keeping a compact size and stable radiation pattern. Finally, the proposed antenna is fabricated and tested. Measured results show that the antenna without any extra feeding network has gained a wide-bandwidth (|S11 |
| Databáze: | OpenAIRE |
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