Wideband Low Axial Ratio and High-Gain Sequentially Rotated Antenna Array

Hu, Wei; Inserra, Daniele; Chen, Zhizhang

doi:10.1109/lawp.2018.2872937

Cited by 15 publications

(22 citation statements)

References 17 publications

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“…The proposed antenna exhibits an excellent trade-off between gain and size, wide 3 dB gain bandwidth and, in general, good overlapped bandwidth. Although similar results can be found in [14] due to employment of a similar structure, the presented antenna exhibits reduced gain degradation within the working bandwidth, as proved by a wider 3 dB gain bandwidth. Furthermore, it should be noted that in the case of mere broadside gain optimization, an estimated gain enhancement of about 0.8 dB has to be added to the peak gain value in Table 2, according to the analysis proposed in Section 2.5 (h = 15 mm and d = 0.7λ, which also correspond to a reduced normalized thickness of 0.053λ).…”

Section: Measurement Results and Discussionsupporting

confidence: 82%

“…As expected, the two-level SR feed network exhibits improved performance over the one-level SR feed network antenna array. In particular, S11 and AR bandwidths widen considerably by applying the second level of SR, as already seen in [14]. Furthermore, since with the one-level SR feed network the antenna elements are LP, while with the two-level SR feed network the antenna elements are CP (thanks to the presence of the element series divider), there is a gain enhancement of about 3 dB in terms of maximum value [21].…”

Section: Sequential Rotated Feed Networkmentioning

confidence: 71%

“…In this manuscript, a 2 × 2 SR antenna array with high-gain characteristics for long-range UHF RFID systems is developed. Similar to [14] (where the objective was, however, the feed network optimization for achieving wideband axial ratio (AR) with ≤1 dB performance), a two-level SR feed network using series power dividers was implemented. Series-fed arrays have been already proposed in the literature [15,16], but in this case, the series configuration was employed to implement the SR method.…”

Section: Introductionmentioning

confidence: 99%

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A Circularly Polarized Antenna Array with Gain Enhancement for Long-Range UHF RFID Systems

Inserra

et al. 2019

Electronics

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A 2 × 2 circularly polarized (CP) sequential rotation microstrip patch antenna array with high gain for long-range ultra-high frequency (UHF) radio frequency identification (RFID) communication is proposed in this paper. In order to meet the operational frequency band requirement of 840–960 MHz and, at the same time, achieve enhanced broadside gain, a two-level sequential rotation structure is developed. Series power divider is used as the basic element of the feed network that is implemented with the substrate-integrated coaxial line technology for minimizing radiation losses. The manufactured prototype exhibits a peak gain of 12.5 dBic at 900 MHz and an axial ratio (AR) bandwidth (AR ≤ 3 dB) of 18.2% from 828 to 994 MHz. In comparison with the state-of-the-art, the proposed antenna shows an excellent gain/size trade-off.

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Section: Measurement Results and Discussionsupporting

confidence: 82%

Section: Sequential Rotated Feed Networkmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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A Circularly Polarized Antenna Array with Gain Enhancement for Long-Range UHF RFID Systems

Inserra

et al. 2019

Electronics

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“…The implementation of a SR antenna array mainly uses a sequential‐phase shifter (SPS) with sequential phase shifts of 0°, 90°, 180°, and 270° at four output ports to excite each antenna element 4 . Many typical SR 2 × 2 antenna arrays with the SPS and four SR antenna elements have been proposed in References 4‐14. By designing the SPS and antenna element, a sequential rotated antenna arrays (SRAA) with CP radiation can be achieved.…”

Section: Introductionmentioning

confidence: 99%

Circularly polarized sequentially rotated antenna array for dual‐band WLAN applications

Pan

Chen

2021

Int J RF Microw Comput Aided Eng

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This article presents a dual‐band circularly polarized (CP) 2 × 2 sequentially rotated (SR) antenna array with four slot antennas, a wideband sequential‐phase shifter (SPS), and reflected plane for wireless local area network (WLAN) operations. By designing the four slot antennas for dual‐band CP operations, the wideband SPS including four outputs with a sequential phase shift of 90° for improving bandwidth, and a conductor‐backed reflected plane for enhancing antenna gain, a high‐gain and dual‐band CP SR antenna array can be realized. The measured impedance bandwidth for return loss of 10 dB is 93.81% (2.36‐6.5 GHz). Both measured CP bandwidths for axial ratio of 3 dB are 22.64% (2.35‐2.95 GHz) and 49.16% (4.5‐6.77 GHz), which can cover all the WLAN bands. Maximum antenna gains are 12.32, 9.91, and 11.66 dBic in the range of 2.4 to 2.484, 5.15 to 5.35, and 5.725 to 5.875 GHz, respectively.

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“…Besides, a cavity filled with absorbing material has been placed under spiral aperture to absorb the back‐lobe radiation. What is more, sequentially rotated antenna array is another effective way to increase AR bandwidth and obtain high gains. In Reference , the array antenna applies two stages of sequential rotating feeding network, which strengthen the performance of circular polarization and high gain.…”

Section: Introductionmentioning

confidence: 99%

A unidirectional ultra‐wideband circularly polarized spiral antenna array

Geng

Liu

et al. 2020

Micro & Optical Tech Letters

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This paper studies a unidirectional ultra-wideband circularly polarized (CP) spiral antenna array. The ultrawideband high-gain CP operation is realized by implementing four-element sequentially rotated spiral array antennas fed with an ultra-wideband feeding network. Tapered multisections power dividers and broadband microstrip-slot phase shifters are utilized to provide accurately equal power division and constant phase shifts of 90 . In order to further improve the CP operating bandwidth, foam of absorber is adopted between the radiating aperture and the feeding network substrate. The proposed CP array is designed, fabricated, and measured. Test results show that the impendence bandwidth of the proposed array covers 2.2 to 11.6 GHz (5.3:1) and 3 dB axial-ratio bandwidth covers 2.3 to 13 GHz (5.65:1), demonstrating a stable CP array performance within an ultra-wide working bandwidth. K E Y W O R D Sabsorbing material, circular polarization, spiral antenna, wideband array, wideband feeding network

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Wideband Low Axial Ratio and High-Gain Sequentially Rotated Antenna Array

Cited by 15 publications

References 17 publications

A Circularly Polarized Antenna Array with Gain Enhancement for Long-Range UHF RFID Systems

A Circularly Polarized Antenna Array with Gain Enhancement for Long-Range UHF RFID Systems

Circularly polarized sequentially rotated antenna array for dual‐band WLAN applications

A unidirectional ultra‐wideband circularly polarized spiral antenna array

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