平面集成式滤波天线的研制

发布时间：2019-04-24 17:53

【摘要】：随着集成电路技术的发展,对于无线通信系统,有源电路的部分已经实现了小型化甚至微型化,因此整个无线通信系统也转而开始要求小型化、高性能化的无源电路。这其中,具有滤波特性的微带天线不但可以满足当前各种技术发展的需求,而且也会是未来发展的一大趋势。作为无源电路的重要组成部分,天线和滤波器都是不可缺少的。将这两者集成化,就构成了滤波天线。微带滤波天线是指对于指定的一些频段具有滤波功能的微带天线。由于微带滤波天线兼具了天线和滤波器的功能,所以这种微带天线不仅解决了传统的电子设备中天线和滤波器之间级联存在的失配问题,而且还减小了器件之间不必要的能量损失,另外,由于微带滤波天线针对天线和滤波器进行了协同设计,整体的体积上也会有所减小,性能也有所提高。本文一开始,通过分析和研究传统的设计理念和方法,针对滤波器和天线,作为两个独立的组件,分别阐述了微带带通滤波器的设计方法以及微带天线的设计方法,分析了传统设计方法中存在的不足之处。同时搜集了近些年来国内外对天线和滤波器进行综合设计的研究情况。在这些基础上,提出了一种从设计端就有所创新的微带滤波天线的设计理念。该滤波天线是由平行耦合线带通滤波器和倒L型天线构成的,其中倒L型天线作为天线之外,还充当了三阶平行耦合线带通滤波器的末级谐振器,从而构成一个带三阶谐振的滤波天线。采用HFSS仿真软件,仿真出中心频率在5GHz,在相对带宽为7.2%的通带内增益大于3dB,且增益波动小于0.5dB,在通带内S11均小于10dB的指标。经过加工和测试,比较测试结果与仿真结果,两者吻合良好,印证了此种设计方法的正确性和可行性。作为后期的改进,通过改变平行耦合线带通滤波器的馈电方式,采用伪交指耦合的结构来实现强耦合,使得线间距得以增大,更加易于加工。最后,对本次研究工作进行总结,并探讨了滤波天线做进一步优化的可能性和研究的方向。
[Abstract]:With the development of integrated circuit technology, the active circuit has been miniaturized or even miniaturized for wireless communication systems. Therefore, the whole wireless communication system has started to require miniaturization and high performance passive circuits. Among them, the microstrip antenna with filter characteristics can not only meet the needs of the development of various technologies, but also will be a major trend in the future. As an important part of passive circuit, antenna and filter are indispensable. When the two are integrated, the filter antenna is formed. Microstrip filter antenna is a microstrip antenna which has filtering function for certain frequency bands. Because the microstrip filter antenna has the function of both antenna and filter, the microstrip antenna not only solves the mismatch problem between the antenna and the filter in the traditional electronic equipment. Moreover, the unnecessary energy loss between devices is reduced. In addition, due to the cooperative design of microstrip filter antenna for antenna and filter, the overall size of the antenna will also be reduced and the performance of the microstrip filter antenna will be improved. At the beginning of this paper, by analyzing and studying the traditional design ideas and methods, the design method of microstrip bandpass filter and microstrip antenna are described respectively, aiming at the filter and antenna as two independent components. The shortcomings of traditional design methods are analyzed. At the same time, the comprehensive design of antenna and filter at home and abroad in recent years is collected. On the basis of these, a new design idea of microstrip filter antenna is put forward, which has been innovated from the design end. The filter antenna is composed of a parallel coupling line band-pass filter and an inverted L-type antenna, in which the inverted L-type antenna serves as the last stage resonator of the third-order parallel coupling line band-pass filter, in addition to the inverted L-type antenna as the antenna. Thus a filter antenna with third-order resonance is constructed. Using HFSS simulation software, the central frequency is 5 GHz, the gain is greater than 3 dB in the pass band with relative bandwidth 7.2%, and the gain fluctuation is less than 0.5 dB, and the S11 is less than the index of 10dB in the pass band. After processing and testing, the comparison of test results and simulation results shows that the two methods are in good agreement with each other, and the correctness and feasibility of the design method are verified. As a later improvement, the structure of pseudo-cross-finger coupling is adopted to realize strong coupling by changing the feed mode of parallel coupling linear band-pass filter, which makes the line spacing larger and easier to process. Finally, the research work is summarized, and the possibility of further optimization of the filter antenna and the research direction are discussed.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN827

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