基于射频直接采样可重构滤波器的研究与实现
发布时间：2019-03-19 08:47
【摘要】：随着通信技术高速发展,电磁环境日趋复杂,研制一种可覆盖全频段且可重构电路以实现调谐的滤波器成为当今研究的热点。为了能有效地对抗无线电干扰,研制的可重构滤波器不仅需要满足可调谐的基本功能,还需要能够通过软件或硬件对滤波器的电路结构实现重构以满足不同频段工作的需要。射频直接采样接收机的性能好坏主要取决于其前端可调窄带带通滤波器的性能,并且接收机的大小,成本,调谐速度等与射频前端的滤波器有很大关系。由此结合课题的实际需要,本论文研制了一种工作于射频段可大范围调谐的数字控制可重构微带滤波器和工作于射频低频段的集成LC电容耦合带通滤波器。论文中根据实际课题的需要设计了一个工作于80MHz-90MHz且可调谐的电容耦合谐振式带通滤波器,其设计指标为3dB带宽为10MHz左右,回波损耗11S参数大于或等于10dB,插入损耗21S参数小于5dB,端口驻波小于或等于2,电调电压的范围为0到30V。通过ADS2009软件仿真可以知道该滤波器的测试结果与给定的指标值在允许的误差范围内,具有良好的滤波效果,可用于频段不高的射频直接采样接收机。由于滤波器的可重构特点,所以根据课题中接收机需要的工作频段范围,设计了一个基于单片机控制的微带梳状线带通滤波器,即数控可重构微带梳状线带通滤波器。数字可重构微带滤波器的设计包括两部分:一个部分是工作于射频段的梳状线带通滤波器的设计;另一个部分是由AT89C52单片机和DAC0832芯片联合控制的数模电压转换输出电路。设计数控微带梳状线带通滤波器的技术指标为工作频率调谐范围0.6GHz到1.5GHz,3dB带宽为50MHz到55MHz左右,滤波器的阶数为3阶,插入损耗21S参数小于7dB,回波损耗11S参数大于或等于20dB,矩形系数小于或等于6,通带外的抑制度大于或等于40dB,电调电压的范围为0到15V,输入输出端口的特性阻抗为50欧姆。测试其S参数的仪器是矢量网络分析仪,根据测试结果可以知道该滤波器的插入损耗,通带衰减,驻波和矩形系数等参数指标实测结果与给定的技术指标的误差在允许范围内,即设计的滤波器具有良好的性能指标,可用于可重构接收机的射频前端进行传输信号的滤波。
[Abstract]:With the rapid development of communication technology, the electromagnetic environment is becoming more and more complex. The development of a tunable filter covering all-band and reconfigurable circuits has become a hot topic in today's research. In order to effectively resist radio interference, the reconfigurable filter not only needs to satisfy the basic tunable function, but also needs to be able to reconstruct the circuit structure of the filter by software or hardware to meet the needs of different frequency bands. The performance of RF direct sampling receiver mainly depends on the performance of the front-end tunable narrow band-pass filter, and the size, cost and tuning speed of the receiver are closely related to the RF front-end filter. Therefore, a digital controlled reconfigurable microstrip filter and an integrated LC capacitive coupling band-pass filter, which can be tuned in a large range in the RF segment, are developed according to the practical needs of the project. In this paper, a tunable capacitive coupled resonant band-pass filter working in 80MHz-90MHz is designed according to the needs of the practical project. The design index is that the 3dB bandwidth is about 10MHz, and the echo loss 11s parameter is greater than or equal to 10 dB. The insertion loss 21s parameter is less than 5dB, the port standing wave is less than or equal to 2, and the range of electric voltage is from 0 to 30V. Through the ADS2009 software simulation, it can be known that the test results of the filter and the given index value are within the allowable error range, and it can be used in the RF direct sampling receiver with low frequency band. Because of the reconfigurable characteristics of the filter, a microstrip comb line band-pass filter based on MCU control is designed according to the range of the receiver in the subject, that is, the NC reconfigurable comb line band-pass filter. The design of digital reconfigurable microstrip filter consists of two parts: one is the design of comb-line band-pass filter which works in the radio frequency section; the other is the output circuit of digital-analog voltage conversion controlled by AT89C52 single chip computer and DAC0832 chip. The technical specifications of the NC microstrip comb linear band-pass filter are as follows: the frequency tuning range 0.6GHz to 1.5GHz, the 3dB bandwidth from 50MHz to 55MHz, the order of the filter is 3, the insertion loss 21s parameter is less than 7dB. The echo loss 11s parameter is greater than or equal to 20 dB, the rectangular coefficient is less than or equal to 6, the suppression system outside the pass band is greater than or equal to 40 dB, the range of voltage regulation is from 0 to 15 V, and the characteristic impedance of the input and output ports is 50 ohm. A vector network analyzer is used to test the S parameter of the filter. According to the test results, the error between the measured results of the parameters such as insertion loss, pass band attenuation, standing wave and rectangular coefficient and the given technical index is within the allowable range. That is, the designed filter has a good performance index, and can be used in the RF front end of the reconfigurable receiver to filter the transmitted signal.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713
本文编号：2443374
[Abstract]:With the rapid development of communication technology, the electromagnetic environment is becoming more and more complex. The development of a tunable filter covering all-band and reconfigurable circuits has become a hot topic in today's research. In order to effectively resist radio interference, the reconfigurable filter not only needs to satisfy the basic tunable function, but also needs to be able to reconstruct the circuit structure of the filter by software or hardware to meet the needs of different frequency bands. The performance of RF direct sampling receiver mainly depends on the performance of the front-end tunable narrow band-pass filter, and the size, cost and tuning speed of the receiver are closely related to the RF front-end filter. Therefore, a digital controlled reconfigurable microstrip filter and an integrated LC capacitive coupling band-pass filter, which can be tuned in a large range in the RF segment, are developed according to the practical needs of the project. In this paper, a tunable capacitive coupled resonant band-pass filter working in 80MHz-90MHz is designed according to the needs of the practical project. The design index is that the 3dB bandwidth is about 10MHz, and the echo loss 11s parameter is greater than or equal to 10 dB. The insertion loss 21s parameter is less than 5dB, the port standing wave is less than or equal to 2, and the range of electric voltage is from 0 to 30V. Through the ADS2009 software simulation, it can be known that the test results of the filter and the given index value are within the allowable error range, and it can be used in the RF direct sampling receiver with low frequency band. Because of the reconfigurable characteristics of the filter, a microstrip comb line band-pass filter based on MCU control is designed according to the range of the receiver in the subject, that is, the NC reconfigurable comb line band-pass filter. The design of digital reconfigurable microstrip filter consists of two parts: one is the design of comb-line band-pass filter which works in the radio frequency section; the other is the output circuit of digital-analog voltage conversion controlled by AT89C52 single chip computer and DAC0832 chip. The technical specifications of the NC microstrip comb linear band-pass filter are as follows: the frequency tuning range 0.6GHz to 1.5GHz, the 3dB bandwidth from 50MHz to 55MHz, the order of the filter is 3, the insertion loss 21s parameter is less than 7dB. The echo loss 11s parameter is greater than or equal to 20 dB, the rectangular coefficient is less than or equal to 6, the suppression system outside the pass band is greater than or equal to 40 dB, the range of voltage regulation is from 0 to 15 V, and the characteristic impedance of the input and output ports is 50 ohm. A vector network analyzer is used to test the S parameter of the filter. According to the test results, the error between the measured results of the parameters such as insertion loss, pass band attenuation, standing wave and rectangular coefficient and the given technical index is within the allowable range. That is, the designed filter has a good performance index, and can be used in the RF front end of the reconfigurable receiver to filter the transmitted signal.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713
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