移相延迟电路的分析与设计

发布时间：2018-05-21 05:58

本文选题：移相器 + 延迟线　；参考：《南京理工大学》2015年硕士论文

【摘要】：移相器与延迟线都是微波控制电路,其中移相器通过控制微波相位,使其在0-360。内变化,从而达到控制微波波束发射方向的目的,而延迟线则控制微波以整波长为基本单位变化。目前,移相器与延迟线广泛应用于雷达系统、微波通讯、电子对抗与卫星技术等领域。随着微波领域相关技术的进步,微波控制电路正向着宽带化、高功率、小型化与集成化的方向发展。本论文主要开展了宽带小型化移相延迟电路的研究,主要内容如下：1.本文设计了一款L波段宽带高功率四位数字式移相器。设计过程中,首先讨论了如何根据功率容量选择合适的PIN二极管；接着在移相单元中利用对称八分之一波长开路、短路支节,四分之一波长阻抗变换原理对开关线型移相结构进行了改进,以实现宽带性能。实物测试结果表明,移相器在23.9%带宽内回波损耗基本大于15.5 dB,与仿真结果较为吻合。2.结合低温共烧陶瓷(LTCC)工艺与基片集成波导(SIW)结构,设计了一款X波段的新型延迟线。由于利用LTCC多层结构来设计小型化延迟线,电路中传输线多次折叠,给匹配带来了很大的困难。利用四分之一波长阻抗变换原理,本文提出了两种改善匹配的电路实现方式,并在设计过程中利用其中一种建立了仿真模型。仿真结果表明,延迟线在9.5-10.5 GHz频带内回波损耗大于18 dB,验证了设计方法的可行性。
[Abstract]:Both the phase shifter and the delay line are microwave control circuits, in which the phase shifter controls the microwave phase and makes the phase shifter range from 0 to 360. In order to control the transmitting direction of the microwave beam, the delay line controls the microwave to change in integral wavelength as the basic unit. At present, phase shifter and delay line are widely used in radar system, microwave communication, electronic countermeasure and satellite technology. With the development of microwave technology, microwave control circuit is developing towards wideband, high power, miniaturization and integration. In this paper, the research of broadband miniaturized phase shift delay circuit is carried out, the main contents are as follows: 1. In this paper, a L-band high-power four-bit digital phase shifter is designed. In the design process, we first discuss how to select the appropriate PIN diode according to the power capacity, and then use the symmetrical 1/8 wavelength open circuit in the phase-shifting unit. The principle of 1/4 wavelength impedance transform is used to improve the phase shifting structure of the switch line to realize the wideband performance. The physical test results show that the echo loss of the phase shifter is more than 15.5 dB in 23.9% bandwidth, which is in good agreement with the simulation results. A new type of X-band delay line was designed by combining the low temperature co-fired ceramic (LTCC) process with the substrate integrated waveguide (SIW) structure. Because of the use of LTCC multi-layer structure to design miniaturized delay lines and multiple folding of transmission lines in the circuit, it is very difficult to match. Based on the principle of 1/4 wavelength impedance transform, this paper presents two kinds of circuit realization ways to improve the matching, and establishes the simulation model by using one of them in the design process. The simulation results show that the echo loss of the delay line in the 9.5-10.5 GHz band is greater than 18 dB, which verifies the feasibility of the design method.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN623

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