X波段FET混频器的研究

发布时间：2018-04-03 05:13

本文选题：X波段　切入点：漏极混频器　出处：《电子科技大学》2015年硕士论文

【摘要】：X波段混频器是无线通信收发机的重要部件之一,它在空间研究、广播卫星、固定通讯业务卫星、地球探测卫星、气象卫星等领域有着广泛地应用。然而,混频器的镜频抑制度、变频损耗、隔离度和噪声等参数的好坏将直接影响接收系统的性能。因此,研究X波段FET混频器有着非常重要的意义。本文主要采用多种微带平面电路器件,对两种X波段混频器,即漏极混频器和自激振荡混频器进行了研究。首先,本文对漏极混频器进行了研究,通过相关的理论分析,提出了漏极混频器的设计方案。根据设计方案,本文分别设计了单管FET漏极混频器,以获得较低的变频损耗;宽阻带低通滤波器,很好地抑制混频器的谐波,降低变频损耗;平行耦合带通滤波器,回收射频信号,阻隔中频信号,减少不必要的能量损耗;直流偏执电路,保护直流信号源,减少射频和中频信号的泄漏。各电路器件采用HFSS和ADS进行了仿真,完成了加工测试。之后,对整体电路进行了仿真和加工测试。测试结果表明,在12.8GH z~13.2GHz频率范围内,变频损耗小于5dB;在射频信号为13.1GHz,输入功率为-20dBm,栅极电压为0V,漏极电压为3V情况下,最优本振功率达到了13dBm。其次,本文对自激振荡混频器进行了理论分析,研究方案的设计,采用HFSS和ADS软件对SIW谐振腔、开路短截线低通滤波器和X波段振荡器等电路模块进行了仿真。之后,将各个模块组合起来进行联合仿真,并对仿真结果进行了加工和测试。测试结果表明,在射频信号为10.8GHz~11.2GHz,输入功率为5dBm,栅极电压为0V,漏极电压为3V情况下,产生的振荡频率为10GHz,变频损耗小于8dB。该电路具有结构紧凑,性能良好,测试方便等优点。从研制的上述两种混频器测试结果来看,测试的主要性能参数与仿真吻合较好,从而验证了本文研究方案的合理性和理论分析的正确性。
[Abstract]:X-band mixer is one of the important components of wireless transceiver. It is widely used in space research, broadcast satellite, fixed communication service satellite, earth exploration satellite, meteorological satellite and so on.However, the performance of the receiver will be directly affected by the mirror frequency rejection, frequency conversion loss, isolation and noise of the mixer.Therefore, it is very important to study X-band FET mixers.In this paper, two kinds of X band mixers, namely drain mixer and self excited oscillation mixer, are studied by using several kinds of microstrip planar circuit devices.First of all, the drain mixer is studied in this paper, and the design scheme of the drain mixer is put forward by theoretical analysis.According to the design scheme, this paper designs a single-transistor FET drain mixer to obtain lower frequency conversion loss, wide stopband low pass filter, good suppression of harmonic and frequency conversion loss, parallel coupling bandpass filter,Recovering RF signal, blocking intermediate frequency signal, reducing unnecessary energy loss, DC paranoid circuit, protecting DC signal source, reducing leakage of RF and if signal.Each circuit device is simulated by HFSS and ADS, and the machining test is completed.After that, the whole circuit is simulated and processed.The test results show that in the frequency range of 12.8GH z~13.2GHz, the frequency conversion loss is less than 5 dB, the optimal local oscillator power is 13 dB m when the RF signal is 13.1 GHz, the input power is -20 dBm, the gate voltage is 0 V, and the drain voltage is 3 V.Secondly, the self-excited oscillation mixer is theoretically analyzed, and the design of the scheme is studied. The circuit modules of SIW resonator, open-circuit short-cut low-pass filter and X-band oscillator are simulated by HFSS and ADS software.After that, the modules are combined for joint simulation, and the simulation results are processed and tested.The test results show that when the RF signal is 10.8GHz (11.2GHz), the input power is 5dBm, the gate voltage is 0V, and the drain voltage is 3V, the oscillation frequency is 10GHz and the frequency conversion loss is less than 8dB.The circuit has the advantages of compact structure, good performance and convenient test.From the test results of the two kinds of mixers mentioned above, the main performance parameters are in good agreement with the simulation, which verifies the rationality of the research scheme and the correctness of the theoretical analysis.
【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】：TN773

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