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A Unified Synthesis Method for Series-Fed Networks Under Equal/Unequal Distributions with Bandwidth Enhancement
Yun-Peng Lyu1,2; Lei Zhu3; Chong-Hu Cheng4
2022-06-24
Source PublicationIEEE Transactions on Antennas and Propagation
ISSN0018-926X
Abstract

Aiming to realize series-fed antenna array with good return loss, low sidelobe level (SLL), and small gain variation over a wide bandwidth, this paper presents a unified synthesis method of designing series-fed networks (SFNs) under the equal/unequal distributions with the bandwidth enhancement. We find the return loss and current distribution bandwidths of SFN are dominated by its input reactance slope. The ratio of SFN main line impedance Z0 and antenna impedance ZL plays an important role in it. When the optimal Z0/ZL makes the input reactance slope equal to zero at the center frequency, the bandwidth of SFN can be highly extended by 2~4 times compared with non-optimal solutions. In this context, four classical types of SFNs are investigated and synthesized. The closed-form optimal formulas for these SFNs are further deduced under the specified element number N and current distributions I1, I2, …, and IN. For experimental verification, an eight-element series-fed antenna array driven by the SFN with Dolph-Chebyshev current distribution is designed and fabricated based on proposed design method. By virtue of the improved SFN, the designed series-fed array exhibits enhanced impedance and radiation bandwidths as predicted. The measured results show designed array achieves impedance bandwidth of 52.2% (3.34-5.70 GHz) with S11 ≤ -10 dB and the radiation bandwidth with SLL ≤ -20 dB is 20.9% (3.85-4.75 GHz). The measured antenna gain is 11.3 dBi with a small variation of 1.3 dB and the efficiency of array is better than 82% over the operational bandwidth of 18.7% (3.88-4.68 GHz).

KeywordAntenna Array Bandwidth Enhancement Series-fed Network Low Sidelobe Level Unified Synthesis Method
DOI10.1109/TAP.2022.3184457
URLView the original
Language英語English
Scopus ID2-s2.0-85133722340
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Document TypeJournal article
CollectionDEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Affiliation1.College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China
2.Faculty of Science and Technology, University of Macau, Macau, China
3.Department of Electrical and Computer Engineering, University of Macau, Macau SAR, China
4.College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China
First Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Yun-Peng Lyu,Lei Zhu,Chong-Hu Cheng. A Unified Synthesis Method for Series-Fed Networks Under Equal/Unequal Distributions with Bandwidth Enhancement[J]. IEEE Transactions on Antennas and Propagation,2022.
APA Yun-Peng Lyu,Lei Zhu,&Chong-Hu Cheng.(2022).A Unified Synthesis Method for Series-Fed Networks Under Equal/Unequal Distributions with Bandwidth Enhancement.IEEE Transactions on Antennas and Propagation.
MLA Yun-Peng Lyu,et al."A Unified Synthesis Method for Series-Fed Networks Under Equal/Unequal Distributions with Bandwidth Enhancement".IEEE Transactions on Antennas and Propagation (2022).
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