A Small Metaline Array Antenna for Circularly Polarized Dual-Band Beam-Steering
A Small Metaline Array Antenna for Circularly Polarized Dual-Band Beam-Steering
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用于圆偏振双频波束控制的小型金属阵列天线
DOI：
10.1109/access.2022.3190687
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发表时间：
2022
期刊：
影响因子：
3.9
通讯作者：
J. Yamauchi
中科院分区：
文献类型：
--
作者：
H. Nakano;T. Abe;J. Yamauchi
A circularly polarized (CP), small, beam-steerable antenna is realized using bent metalines. The antenna has the following features: 1) dual-band operation at low frequency <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {LOW}}$ </tex-math></inline-formula> (wavelength <inline-formula> <tex-math notation="LaTeX">$\lambda _{\mathrm {LOW}}$ </tex-math></inline-formula>) and at high frequency <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {HIGH}}$ </tex-math></inline-formula> (wavelength <inline-formula> <tex-math notation="LaTeX">$\lambda _{\mathrm {HIGH}}$ </tex-math></inline-formula>); 2) a small antenna volume of less than <inline-formula> <tex-math notation="LaTeX">$0.01\lambda _{\mathrm {LOW}}^{3}$ </tex-math></inline-formula>; 3) a small antenna height on the order of <inline-formula> <tex-math notation="LaTeX">$\lambda _{\mathrm {LOW}}$ </tex-math></inline-formula>/100; 4) a small conducting antenna footprint of <inline-formula> <tex-math notation="LaTeX">$0.62\lambda _{\mathrm {LOW}}\times 0.49\lambda _{\mathrm {LOW}}$ </tex-math></inline-formula>; and 5) a phased array antenna consisting of minimum array elements (two elements). Firstly, the antenna characteristics of straight and bent metalines are briefly summarized. Secondly, it is shown that an array antenna composed of two bent metalines forms a CP broadside beam at <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {LOW}}$ </tex-math></inline-formula> using an equal-amplitude/in-phase excitation mode. This is also shown to be true at <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {HIGH}}$ </tex-math></inline-formula>. Thirdly, each of the obtained CP broadside beams at <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {LOW}}$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {HIGH}}$ </tex-math></inline-formula> is steered within the H-plane. The array antenna is found to have a CP beam that is steerable across a region of <inline-formula> <tex-math notation="LaTeX">$\theta = - 40^{\circ }$ </tex-math></inline-formula> to <inline-formula> <tex-math notation="LaTeX">$\theta = + 30^{\circ }$ </tex-math></inline-formula> at <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {LOW}}$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$\theta = - 40^{\circ }$ </tex-math></inline-formula> to <inline-formula> <tex-math notation="LaTeX">$\theta = + 25^{\circ }$ </tex-math></inline-formula> at <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {HIGH}}$ </tex-math></inline-formula>, with an axial ratio of less than 3 dB. During the beam steering, the gain deviation from its maximum value is found to be small: 1.7 dB at <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {LOW}}$ </tex-math></inline-formula> and 1.4 dB at <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {HIGH}}$ </tex-math></inline-formula>.
A circularly polarized (CP), small, beam-steerable antenna is realized using bent metalines. The antenna has the following features: 1) dual-band operation at low frequency <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {LOW}}$ </tex-math></inline-formula> (wavelength <inline-formula> <tex-math notation="LaTeX">$\lambda _{\mathrm {LOW}}$ </tex-math></inline-formula>) and at high frequency <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {HIGH}}$ </tex-math></inline-formula> (wavelength <inline-formula> <tex-math notation="LaTeX">$\lambda _{\mathrm {HIGH}}$ </tex-math></inline-formula>); 2) a small antenna volume of less than <inline-formula> <tex-math notation="LaTeX">$0.01\lambda _{\mathrm {LOW}}^{3}$ </tex-math></inline-formula>; 3) a small antenna height on the order of <inline-formula> <tex-math notation="LaTeX">$\lambda _{\mathrm {LOW}}$ </tex-math></inline-formula>/100; 4) a small conducting antenna footprint of <inline-formula> <tex-math notation="LaTeX">$0.62\lambda _{\mathrm {LOW}}\times 0.49\lambda _{\mathrm {LOW}}$ </tex-math></inline-formula>; and 5) a phased array antenna consisting of minimum array elements (two elements). Firstly, the antenna characteristics of straight and bent metalines are briefly summarized. Secondly, it is shown that an array antenna composed of two bent metalines forms a CP broadside beam at <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {LOW}}$ </tex-math></inline-formula> using an equal-amplitude/in-phase excitation mode. This is also shown to be true at <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {HIGH}}$ </tex-math></inline-formula>. Thirdly, each of the obtained CP broadside beams at <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {LOW}}$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {HIGH}}$ </tex-math></inline-formula> is steered within the H-plane. The array antenna is found to have a CP beam that is steerable across a region of <inline-formula> <tex-math notation="LaTeX">$\theta = - 40^{\circ }$ </tex-math></inline-formula> to <inline-formula> <tex-math notation="LaTeX">$\theta = + 30^{\circ }$ </tex-math></inline-formula> at <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {LOW}}$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$\theta = - 40^{\circ }$ </tex-math></inline-formula> to <inline-formula> <tex-math notation="LaTeX">$\theta = + 25^{\circ }$ </tex-math></inline-formula> at <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {HIGH}}$ </tex-math></inline-formula>, with an axial ratio of less than 3 dB. During the beam steering, the gain deviation from its maximum value is found to be small: 1.7 dB at <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {LOW}}$ </tex-math></inline-formula> and 1.4 dB at <inline-formula> <tex-math notation="LaTeX">$f_{\mathrm {HIGH}}$ </tex-math></inline-formula>.