發(fā)布時(shí)間：2018-12-10 09:55

【摘要】：本文研究采用軌道角動(dòng)量相位模式進(jìn)行信道復(fù)用的菲涅爾輻射近場(chǎng)無(wú)線通信系統(tǒng),著重研究用于該系統(tǒng)的天線設(shè)計(jì)。根據(jù)本課題組已有的研究結(jié)果,說(shuō)明了攜帶多階軌道角動(dòng)量的波束不同相位模式之間的正交性用于信道復(fù)用的原理,以環(huán)形陣列天線為例,闡述了系統(tǒng)信道矩陣及復(fù)用/解復(fù)用的過(guò)程。文章中設(shè)計(jì)了一種環(huán)形槽反射面天線用于產(chǎn)生不同階的軌道角動(dòng)量模式,該天線對(duì)比傳統(tǒng)的拋物面天線和無(wú)反射面的偶極子天線陣列,對(duì)于電磁波數(shù)的能量聚焦具有較好的性能,所有的軌道角動(dòng)量模式下,主波束的增益有明顯提高。針對(duì)陣列天線系統(tǒng),設(shè)計(jì)并制作了一種移相器。結(jié)合近年來(lái)新興的超表面人工電磁材料,本文設(shè)計(jì)了不同的次波長(zhǎng)單元結(jié)構(gòu),該結(jié)構(gòu)構(gòu)成的二維周期平面對(duì)入射的電磁波的反射波的相位可以進(jìn)行超過(guò)360°范圍的調(diào)控,并且保證幅度、極化的一致。將該結(jié)構(gòu)用于一種線極化的反射陣列天線,給出了用于產(chǎn)生不同階軌道角動(dòng)量的控制相位表達(dá)式,設(shè)計(jì)出反射陣天線,采用全波電磁仿真軟件對(duì)設(shè)計(jì)的天線進(jìn)行了分析。針對(duì)上述反射陣天線的不足,文章中提出了采用超表面設(shè)計(jì)的表面波—OAM模式轉(zhuǎn)換圓形陣列天線。推導(dǎo)了該陣列產(chǎn)生軌道角動(dòng)量的原理及表達(dá)式,給出了采用上述超表面單元用于產(chǎn)生不同階的軌道角動(dòng)量波束應(yīng)調(diào)控的相位的表達(dá)式,設(shè)計(jì)并制作了可以產(chǎn)生多個(gè)不同階軌道角動(dòng)量的陣列天線,通過(guò)理論推導(dǎo)、數(shù)值仿真和實(shí)驗(yàn)測(cè)試,給出了該天線的參數(shù),仿真和實(shí)驗(yàn)結(jié)果表現(xiàn)出較好的一致性,達(dá)到了設(shè)計(jì)的預(yù)期。
[Abstract]:In this paper, a Fresnel radiative near field wireless communication system using orbital angular momentum phase mode for channel multiplexing is studied, with emphasis on the antenna design for the system. Based on the existing research results of our group, the principle that the orthogonality between different phase modes of beams carrying multi-order orbital angular momentum is used for channel multiplexing is explained. The annular array antenna is taken as an example. The system channel matrix and the process of multiplexing / demultiplexing are described. In this paper, an annular slot reflector antenna is designed to generate different orbital angular momentum modes. The antenna pair is compared with the traditional parabolic antenna and the non-reflective surface dipole antenna array. For the energy focusing of electromagnetic wave number, the gain of the main beam is improved obviously in all orbital angular momentum modes. A phase shifter is designed and fabricated for array antenna system. Combined with the newly developed supersurface artificial electromagnetic materials, different subwavelength unit structures are designed in this paper. The phase of the reflected waves of the incident electromagnetic waves can be adjusted by the two-dimensional periodic plane of the structure in a range of more than 360 擄. And to ensure the amplitude, polarization consistent. The structure is applied to a linearly polarized reflector array antenna. The control phase expression for different order orbital angular momentum is given and the reflector array antenna is designed. The designed antenna is analyzed by the full wave electromagnetic simulation software. In order to overcome the shortcomings of the above antenna, a surface-wave-OAM mode converted circular array antenna is proposed in this paper. The principle and expression of orbital angular momentum generated by the array are derived, and the expression of the phase to be controlled by the supersurface element mentioned above is given, which is used to generate different order orbital angular momentum beams. An array antenna with different order orbital angular momentum is designed and fabricated. The parameters of the antenna are obtained by theoretical derivation, numerical simulation and experimental test. The results of simulation and experiment show good agreement. Meet the design expectations.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN820
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本文編號(hào)：2370386