极化与频率可重构天线设计

发布时间：2018-05-29 00:51

本文选题：圆极化 + 可重构　；参考：《南京信息工程大学》2017年硕士论文

【摘要】：本文就极化可重构和频率可重构天线的研究背景,讨论了极化与频率可重构天线的研究目的和意义,结合相关理论基础,设计了两款极化可重构天线和一款频率可重构手机天线。实测和仿真性能均达到设计要求。论文的主要工作内容总结如下:第一,提出一种共面波导馈电的极化可重构四叶草天线,可实现左旋圆极化和右旋圆极化的工作状态切换。在四叶草结构的中心处安装四个PIN二极管,用于控制圆极化的旋向。天线工作在2.45GHz频段,两种极化状态下实测-10dB阻抗带宽达到300MHz (2.28～2.58GHz),实测3dB轴比带宽为440MHz(2.1～2.54GHz),带宽内实测增益大于2dBi,最高增益达到3.89dBi。第二,提出了一款圆极化可重构天线,该天线具有新颖的天线结构,可工作在WLAN,RFID,ETC等短距离无线通信系统。-10dB阻抗带宽为5.78-5.96GHz,3dB轴比带宽为5.61-5.99GHz,中心频率增益为3.84dBi。通过安装在共面波导接地端两个PIN二极管的通断来控制天线的极化方式的切换,天线的馈电使用一个T型偏置器馈入直流和射频信号,直流信号用于控制二极管的通断。为5.8GHz频段的极化可重构天线设计提供了新的思路。第三,提出一种使用射频开关控制的频率可重构手机天线,采用单极子耦合馈电结构,天线由一段倒L型馈电枝节,一条高频接地枝节和一条低频接地枝节构成,低频枝节通过射频开关分别连接四个不同值的电感。通过射频开关将低频枝节分别串联不同的电感耦合接地,从而对低频实现频率重构。天线-6dB阻抗带宽可以覆盖低频683-960MHz和高频1460-2820MHz频段。
[Abstract]:In this paper, the purpose and significance of polarization and frequency reconfigurable antennas are discussed based on the research background of polarization reconfigurable antenna and frequency reconfigurable antenna. Two polarized reconfigurable antennas and a frequency reconfigurable mobile phone antenna are designed. The measured and simulated performances meet the design requirements. The main work of this paper is summarized as follows: first, a coplanar waveguide fed poled reconfigurable clover antenna is proposed, which can switch the working state between left-handed circular polarization and right-handed circular polarization. Four PIN diodes are installed at the center of the clover structure to control the rotation of circular polarization. The antenna operates in the 2.45GHz band. The measured -10dB impedance bandwidth of the antenna reaches 300MHz 2.28 ~ 2.58 GHz / L in two polarization states, and the measured 3dB axis ratio bandwidth is 440 MHz / 2. 1 / 2. 54 GHz / 2. The measured gain in the bandwidth is more than 2 dBi.The maximum gain is 3.89 dBi. Secondly, a circular polarized reconfigurable antenna is proposed. The antenna has a novel antenna structure and can work in short range wireless communication systems such as WLAN RF IDTc. The impedance bandwidth of 5.78-5.96GHz / 3dB axis is 5.61-5.99GHz, and the center frequency gain is 3.84dBi. The switching of the antenna polarization mode is controlled by the on-off of two PIN diodes mounted on the ground end of the coplanar waveguide. The antenna feed uses a T-type bias to feed into the DC and RF signals, and the DC signal is used to control the on-off of the diode. It provides a new idea for the design of polarized reconfigurable antenna in 5.8GHz band. Thirdly, a frequency reconfigurable mobile phone antenna controlled by RF switch is proposed. The antenna is composed of a segment of inverted L-shaped feed section, a high-frequency ground branch and a low-frequency earthing branch. The low frequency branch is connected to four different inductors by radio frequency switch. The low frequency segments are connected in series with different inductively coupled earthing by radio frequency switch, so the frequency reconstruction of the low frequency can be realized. Antenna-6 dB impedance bandwidth can cover low frequency 683-960MHz and high frequency 1460-2820MHz band.
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN820

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