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In this paper, a 360° continuously scanning circular array antenna is presented. The circular array consists of eight Yagi-Uda monopoles, each one consisting of a driver, a reflector and four directors. When the circular array is fed identically, an azimuthal omnidirectional pattern is obtained. When the circular array is fed with an optimized distribution of excitations that is calculated by the expanded method of maximum power transmission efficiency, an azimuthal directional pattern with maximum directional gain is obtained. The measurement and simulation results indicate that the average gain of the omnidirectional pattern is about 3.78 dBi with azimuthal fluctuation of less than 2.0 dBi, and the maximum gain of the directional pattern is about 11.1 dBi with azimuthal continuously scanning fluctuation of less than 0.4 dBi and front-to-back ratio of larger than 12.5 dB. The reported circular array antenna is featured by high directional gain and 360° azimuthal beam continuous scanning, and it has potential applications in indoor communications.
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Keywords:
- Yagi-Uda monopole /
- circular array antenna /
- beam scanning /
- expanded method of maximum power transmission efficiency
[1] Bellofiore S, Balanis C A, Foutz J, Spanisa A S 2002 IEEE Antennas Propag. Mag. 44 145
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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[7] Miao X B, Wan W, Duan Z, Wen G Y 2019 IEEE Antennas Wirel. Propag. Lett. 18 752
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[10] Liu H T, Gao S, Hong Loh T 2011 IEEE Antennas Wirel. Propag. Lett. 10 1349
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[11] Liu H T, Gao S, Hong Loh T 2012 IEEE Trans. Antennas Propag. 60 1540
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[15] Fan H J, Liang X L, Geng J P, Jin R H, Zhou X L 2016 IEEE Trans. Antennas Propag. 64 3228
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[16] Ge L, Li M J, Li Y J, Wong H, Luk K M 2018 IEEE Trans. Antennas Propag. 66 1747
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[17] Shahidul Alam M, Abbosh A 2016 IET Microw. Antennas Propag. 10 1030
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[18] Jin G P, Li M L, Liu D, Zeng G J 2018 IEEE Antennas Wirel. Propag. Lett. 17 1664
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[19] Wang P Y, Jin T, Meng F Y, Lyu Y L, Erni D, Wu Q, Zhu L 2018 IEEE Trans. Antennas Propag. 66 627
Google Scholar
[20] Kahar M, Kanti Mandal M 2021 IEEE Trans. Antennas Propag. 69 3538
Google Scholar
[21] Zhu H L, Wai Cheung S, lp Yuk T 2015 IET Microw. Antennas Propag. 9 1331
Google Scholar
[22] Tang M C, Ziolkowski R W 2015 IET Microw. Antennas Propag. 9 1363
Google Scholar
[23] 韩亚娟, 张介秋, 李勇峰, 王甲富, 屈绍波, 张安学 2016 65 147301
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Han Y J, Zhang J Q, Li Y F, Wang F J, Qu S B, Zhang A X 2016 Acta Phys. Sin. 65 147301
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
Wang S Y, Zheng H Y, Li Y 2020 Acta Phys. Sin. 69 218402
Google Scholar
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Google Scholar
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Google Scholar
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图 1 三种地板结构的圆形阵列天线 (a) 全局地板; (b) 局部地板; (c)开槽局部地板
Figure 1. Circular array antenna with three ground structures: (a) Full ground; (b) partial ground; (c) partial ground with slots.
图 2 (a) 扇区单元结构; (b) 开槽局部地板结构
Figure 2. (a) Structure of sector unit; (b) partial ground with slots.
图 3 三种八木圆形阵列天线的(a)回波损耗和(b)相邻阵元隔离度
Figure 3. (a) Return loss and (b) isolation of the three Yagi circular arrays.
图 4 0°扇区天线阵元增益 (a) xoz面; (b) xoy面
Figure 4. Element gain patterns of the three arrays in the 0° zone: (a) xoz plane; (b) xoy plane.
图 5 三种地板结构的电流分布 (a) 全局地板; (b) 局部地板; (c)开槽局部地板
Figure 5. Current distributions of the three ground structures: (a) Full ground; (b) partial ground; (c) partial ground with slots.
图 6 广义无线功率传输系统
Figure 6. Generalized wireless power transfer system.
图 7 射频馈电网络 (a) 原理图; (b) 实物图
Figure 7. Radio frequency feeding network: (a) Schematic diagram; (b) photo picture.
图 8 圆形阵列天线实物图 (a)正面; (b)背面
Figure 8. Photo of the circular array antenna: (a) Front view; (b) back view.
图 9 圆形阵列天线阵元反射系数模和相邻阵元间隔离度
Figure 9. Element reflection and adjacent isolation of the circular array.
图 10 天线系统实物图
Figure 10. Photo of the antenna system.
图 11 全向波束增益方向图 (a) xoy面; (b) yoz面
Figure 11. Gain pattern of the omnidirectional beam: (a) xoy plane; (b) yoz plane.
图 12 定向波束增益方向图 (a) 0°; (b) 15°; (c) 30°; (d) 45°
Figure 12. Gain pattern of the directional beam: (a) 0°; (b) 15°; (c) 30°; (d) 45°.
图 13 定向波束最大增益与方位角关系
Figure 13. Peak gain of the directional beam versus azimuthal angle.
表 1 带开槽局部地板结构的圆形阵列天线结构参数
Table 1. Parameters of the circular array antenna with slotted partial ground.
Parameter Values/mm Parameter Values/mm h1 35.0 l2 2.5 h2 22.5 l3 4.0 h3 22.0 l4 26.8 R 120.0 l5 61.2 d1 29.0 w1 10.6 d2 22.0 w2 1.3 d3 16.0 w3 15.0 l1 13.0 w4 2.0 
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表 2 不同方位定向波束的圆形阵列天线激励分布(最佳幅值和相位)
Table 2. Excitations (optimum amplitude and phase) of the circular array antenna for different directional beams.
Port Azimuthal angle/(°) 0 15 30 45 1 0.74,∠–96° 0.71,∠–118° 0.60,∠–106° 0.43,∠–119° 2 0.44,∠0° 0.60,∠–80° 0.70,∠–144° 0.75,∠146° 3 0.16,∠114° 0.19,∠26° 0.29,∠–25° 0.43,∠–119° 4 0.10,∠16° 0.09,∠–99° 0.12,∠131° 0.16,∠–7° 5 0, ∠178° 0.03,∠155° 0.04,∠–44° 0.09,∠–116° 6 0.10,∠12° 0.03,∠–18° 0.03,∠106° 0.05,∠56° 7 0.17,∠113° 0.13,∠156° 0.10,∠–155° 0.09,∠–111° 8 0.44,∠0° 0.27,∠0° 0.20,∠0° 0.16,∠0°
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表 3 圆形阵列天线性能对比
Table 3. Comparison of the recent work with reported circular arrays.
Ref. Working frequency bands/GHz Size of the circular array
($ {\lambda _0} \times {\lambda _0} $)No. of the antenna element No. of beams for
360° coverageRealized maximum gain/dBi [5] 0.783—0.886 0.9×0.9 4 16 6.0 [7] 2.32—2.78 0.64×0.64 8 8 8.4 [15] 4.78—5.19 1.9×1.9 6 12 9.2 [16] 1.65—2.75 0.51×0.51 4 4 5.4 [17] 2.35—2.61 0.64×0.64 8 8 4.5 [18] 2.25—3.16 0.61×0.61 4 4 4.1 [19] 0.7—1.2 0.43×0.43 6 6 3.1 [20] 8.8—11.2 3.02×3.02 8 8 5.2 This work 3.26—3.73 2.72×2.72 8 Continuous 11.1
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[1] Bellofiore S, Balanis C A, Foutz J, Spanisa A S 2002 IEEE Antennas Propag. Mag. 44 145
Google Scholar
[2] 蒋基恒, 余世星, 寇娜, 丁召, 张正平 2021 70 238401
Google Scholar
Jiang J H, Yu S X, Kou N, Ding Z Zhang Z P 2021 Acta Phys. Sin. 70 238401
Google Scholar
[3] 胡昌海, 王任, 陈传升, 王秉中 2021 70 098401
Google Scholar
Hu C H, Wang R, Chen C S, Wang B Z 2021 Acta Phys. Sin. 70 098401
Google Scholar
[4] Yang X D, Geyi W, Sun H C 2017 IEEE Antennas Wirel. Propag. Lett. 16 1824
Google Scholar
[5] Wan W, Wen G Y, Gao S 2018 IEEE Access 6 16092
Google Scholar
[6] Wen S C, Xu Y Z, Dong Y D 2021 IEEE Antennas Wirel. Propag. Lett. 20 488
Google Scholar
[7] Miao X B, Wan W, Duan Z, Wen G Y 2019 IEEE Antennas Wirel. Propag. Lett. 18 752
Google Scholar
[8] Taillefer E, Hirata A, Ohira T 2005 IEEE Trans. Antennas Propag. 53 678
Google Scholar
[9] Lu J W, Irelan D, Schlub R 2005 IEEE Trans. Antennas Propag. 53 2437
Google Scholar
[10] Liu H T, Gao S, Hong Loh T 2011 IEEE Antennas Wirel. Propag. Lett. 10 1349
Google Scholar
[11] Liu H T, Gao S, Hong Loh T 2012 IEEE Trans. Antennas Propag. 60 1540
Google Scholar
[12] Juan Y, Che W Q, Yang W C, Chen Z N 2017 IEEE Antennas Wirel. Propag. Lett. 16 557
Google Scholar
[13] Ababil Hossain M, Bahceci I, Cetiner B A 2017 IEEE Trans. Antennas Propag. 65 6444
Google Scholar
[14] Yang Y, Zhu X 2018 IEEE Trans. Antennas Propag. 66 600
Google Scholar
[15] Fan H J, Liang X L, Geng J P, Jin R H, Zhou X L 2016 IEEE Trans. Antennas Propag. 64 3228
Google Scholar
[16] Ge L, Li M J, Li Y J, Wong H, Luk K M 2018 IEEE Trans. Antennas Propag. 66 1747
Google Scholar
[17] Shahidul Alam M, Abbosh A 2016 IET Microw. Antennas Propag. 10 1030
Google Scholar
[18] Jin G P, Li M L, Liu D, Zeng G J 2018 IEEE Antennas Wirel. Propag. Lett. 17 1664
Google Scholar
[19] Wang P Y, Jin T, Meng F Y, Lyu Y L, Erni D, Wu Q, Zhu L 2018 IEEE Trans. Antennas Propag. 66 627
Google Scholar
[20] Kahar M, Kanti Mandal M 2021 IEEE Trans. Antennas Propag. 69 3538
Google Scholar
[21] Zhu H L, Wai Cheung S, lp Yuk T 2015 IET Microw. Antennas Propag. 9 1331
Google Scholar
[22] Tang M C, Ziolkowski R W 2015 IET Microw. Antennas Propag. 9 1363
Google Scholar
[23] 韩亚娟, 张介秋, 李勇峰, 王甲富, 屈绍波, 张安学 2016 65 147301
Google Scholar
Han Y J, Zhang J Q, Li Y F, Wang F J, Qu S B, Zhang A X 2016 Acta Phys. Sin. 65 147301
Google Scholar
[24] Tang M C, Duan Y L, Wu Z T, Chen X M, Li M, Ziolkowski R W 2019 IEEE Trans. Antennas Propag. 67 1467
Google Scholar
[25] Wen Y B, Qin P Y, Wei G M, Ziolkowski R W 2022 IEEE Trans. Antennas Propag. 70 6042
Google Scholar
[26] Schlub R, Lu J W, Ohira T 2003 IEEE Trans. Antennas Propag. 51 3033
Google Scholar
[27] Schlub R, Thiel D V 2004 IEEE Trans. Antennas Propag. 52 1343
Google Scholar
[28] Shan L, Wen G Y 2014 IEEE Trans. Antennas Propag. 62 5565
Google Scholar
[29] 王身云, 郑淏予, 李阳 2020 69 218402
Google Scholar
Wang S Y, Zheng H Y, Li Y 2020 Acta Phys. Sin. 69 218402
Google Scholar
[30] Wen G Y 2021 IEEE Open J. Antennas Propag. 2 412
Google Scholar
[31] Wang S Y, Jin X R, Liu P, Geyi W 2022 IEEE Antennas Wirel. Propag. Lett. 21 2512
Google Scholar
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