高功率雷达空间功率合成效率研究

高功率微波空间功率合成效率直接关系到高功率雷达输出功率的大小,重点研究高功率雷达空间功率合成效率问题。首先推导出高功率微波空间合成效率公式;然后分析了影响合成效率的相位误差、目标位置误差、时延误差和阵元间距误差等因素;最后提出一种幅度-相位联合调整的方法,通过增加幅度调整电路和相位调整电路,减小通道的幅相误差,提高空间功率合成效率。     

一种宽禁带器件的高效E类功率放大器设计

E类功率放大器是一种新型高效率放大器,属于开关模式功率放大器,其理论效率可以达到100%。可用于雷达、通信和电子对抗等领域的末级功率放大器,是系统高效率、高功率和小型化功率放大器的重要途径。通过分析其工作原理,设计了一款L波段高效E类功率放大器,输出功率大于10 W,实际漏极效率达到74.8%。     

L波段高效率射频功率放大器的设计与仿真

射频功率放大器是无线通信系统中的重要组成部分,其工作效率直接影响着整个系统的耗能、稳定度和对电源散热装置的要求,提高射频功率放大器的效率,能够节约能源,降低功耗,因此实现射频功率放大器的高效率工作是目前射频功率放大器领域的热点问题之一。本文选用Freescale晶体管MW6S004N,借助ADS2013软件,采用负载牵引技术和源牵引技术得到最佳负载阻抗和最佳源阻抗,并用Smith圆图进行电路的匹配设计,对射频功率放大器进行了仿真和优化。仿真结果表明,在频率为1960MHz的L波段,输入功率为21d Bm时,射频功率放大器的输出功率大于36d Bm,功率附加效率大于50%。这种高效率射频功率放大器适用于WCDMA基站,对基站中高效率功率放大器的设计有着重要的参考价值。     

Design and analysis of a high efficiency linear power amplifier

A high efficiency linear power amplifier is introduced based on the idea of Switch-Linear Hybrid (SLH) power conversion. The SLH power amplifier developed from the conventional class B power amplifier, while the class B configuration power unit in the SLH power amplifier is fed by a dynamic switching power supply, not the usual constant DC power supply. Thus, the efficiency of the class B configuration power unit in SLH power amplifier can be greatly improved. By combining linear power amplifier with switching power supply, the SLH power amplifier has synthetic performance of high fidelity, high efficiency and excellent dynamic characteristics. In this article, analysis of SLH power amplifier is performed, especially focusing on its linear power unit which is the core of SLH power amplifier. Design considerations are also presented parallel with the analysis. Both the theoretical analysis and experimental results verify the validity of SLH power amplifier.     

High-brightness, high-efficiency, single-quantum-well laser diode array

Single-quantum-well, separate-confinement double-heterostructure laser diode arrays which exhibit a high power conversion efficiency of greater than 54% have been demonstrated. The high efficiency results from a low internal loss of 3cm1 and high internal conversion efficiency. The maximum output power for a 100?m emitting aperture is 2 W CW and is independent of the cavity length.     

基于波导合成高效高功率密度Ku波段功放

提出了一种基于BB180波导电桥合成器与波导微带双探针相结合的Ku波段高效空间合成方案,波导合成实现了高效率,波导微带双探针结构实现功率模块的叠层安装,在Ku波段通过二者的结合实现了高功率密度。首先利用HFSS软件分析波导合成器和波导微带双探针模型,给出了仿真结果。在工程设计中采用GaN功率芯片构成放大器小模块单元,输出峰值功率25W。功放采用8个模块单元合成,在Ku波段合成饱和输出180W峰值功率(19%占空比),合成效率超过85%,附加效率高于25%,功率密度达到0.135W/cm3,实现了Ku波段微波高效合成与高功率密度输出。     

基于GaN的大功率高线性固态发射机研制

介绍了一种GaN大功率高线性固态发射机。利用GaN HEMT的高功率特性,结合新型波导魔T低损耗功率合成的特点,在7.9~8.4GHz范围内实现了连续波饱和输出功率大于200W,效率大于20%。此外,应用新型模拟预失真方法提升功放的线性化指标,在额定输出功率下三阶交调指标(IMD3)优于-30dBc,改善功放的线性度11dB。该发射机具有输出功率大,线性度好等优点,整体性能优于国外同类产品。     

On the Continuity of High Efficiency Modes in Linear RF Power Amplifiers

A novel formulation for the voltage waveforms in high efficiency linear power amplifiers is described. This formulation demonstrates that a constant optimum efficiency and output power can be obtained over a continuum of solutions by utilizing appropriate harmonic reactive impedance terminations. A specific example is confirmed experimentally. This new formulation has some important implications for the possibility of realizing broadband >10% high efficiency linear RF power amplifiers.     

Design of N-way distributed Doherty amplifier for WCDMA and OFDM applications

A novel three-way distributed Doherty power amplifier with an extended efficiency range for WCDMA or OFDM repeater or base-station applications is presented. This distributed Doherty amplifier consists of one main amplifier and two peaking amplifiers. To achieve high efficiency at a high back-off power, the peaking amplifier structure is based on the dual-fed distributed amplifier form. The 2140 MHz measured results of the three-way distributed Doherty amplifier yielded an 11 dB power gain, with 39.5% power added efficiency at 9.5 dB back-off power     

High-Efficiency Envelope-Tracking W-CDMA Base-Station Amplifier Using GaN HFETs

A high-efficiency wideband code-division multiple-access (W-CDMA) base-station amplifier is presented using high-performance GaN heterostructure field-effect transistors to achieve high gain and efficiency with good linearity. For high efficiency, class J/E operation was employed, which can attain up to 80% efficiency over a wide range of input powers and power supply voltages. For nonconstant envelope input, the average efficiency is further increased by employing the envelope-tracking architecture using a wide-bandwidth high-efficiency envelope amplifier. The linearity of overall system is enhanced by digital pre-distortion. The measured average power-added efficiency of the amplifier is as high as 50.7% for a W-CDMA modulated signal with peak-to-average power ratio of 7.67 dB at an average output power of 37.2 W and gain of 10.0 dB. We believe that this corresponds to the best efficiency performance among reported base-station power amplifiers for W-CDMA. The measured error vector magnitude is as low as 1.74% with adjacent channel leakage ratio of -51.0 dBc at an offset frequency of 5 MHz     

基于双向牵引技术的射频功放设计与仿真

射频功率放大器是无线通信系统的核心部件,其输出功率和附加效率是设计的重点和难点,现有方法很难在功率和效率之间取得一致.为了解决这一问题,文中在综合考虑谐波分量以及负载阻抗、源阻抗对输出功率和附加效率影响的基础上,采用新型多谐波双向阻抗牵引技术,结合实例设计了一种高效率的射频功率放大器.在ADS中进行仿真,仿真结果表明功放在获得最佳附加效率的同时又有较高输出功率,证明了该方法的有效性.     

用于无线能量传输的高效率半导体激光器设计

激光无线能量传输在无人机、卫星空间站和探月机器人供电等方面具有潜在应用前景,其系统效率成为了其应用的关键瓶颈。为了提高激光无线能量传输系统发射端激光器的电光转换效率、接收端光斑均匀性和有效窗口收光比,提出了用于激光无线能量传输发射端的高效率半导体激光器设计方案。基于合束效率较高的空间合束设计了一套高功率高效率半导体激光系统,接收端光斑不均匀度可优化至0.207,有效窗口内收光比大于94%。搭建了千瓦级激光无线能量传输实验装置,发射端半导体激光系统直接输出矩形光斑,与矩形光电池匹配,提高了电池阵布片率。利用多光束指向性可调节特点,优化了接收端光斑均匀度,有利于提高接收端电池的转换效率及简化电源管理。该设计与研究为激光无线能量传输的实际应用提供了借鉴意义。     

适用于包络跟踪的开关电源调制电路设计

包络跟踪技术已经成为提高功率放大器效率的重要研究方向,其中高效率、高功率开关电源调制器是研究重点.对实际的开关电源调制电路以及相应的参数进行了分析,提出了适用于包络跟踪技术的开关电源调制电路.利用Spice软件对设计的电路进行了电路仿真,利用Cadence软件进行了印制电路板(PCB)电路的设计.经过实际测试,该开关电源调制器的输出电压达到48 V,电流约为0.9A,整个功能模块效率接近96％.该开关电源调制电路不仅具有高效率高功率输出脉冲信号,还可以根据设计需求改变NMOS管型号,并设计出不同开关频率、不同功率输出的开关电源调制电路.     

High-power generation in IMPATT devices in the 100-200-GHz range

A silicon double-drift IMPATT diode with high uniform doping levels was simulated. Simulation results show that it is possible for silicon IMPATT diodes to generate extremely high pulsed output power for frequencies above 100 GHz under high current-density operation. The highest output power matched to a 1-Ω load resistance obtained at 150 GHz is 37.7 W with a DC current density of 200 kA/cm², although the calculated power conversion efficiency is low. It is also shown that the low-power conversion efficiency limits the diode's continuous wave power operation     

毫米波300W固态功率合成放大器的设计

基于单片微波集成功率放大器(Monolithic Microwave Integrated Circuits,MMIC PA)的毫米波波导空间功率合成技术是固态毫米波高功率电子领域的热门研究方向。多合成支路情况,保持较高的合成效率和较宽的工作带宽是实现固态毫米波宽带高功率合成的关键技术难题。为提高功率合成效率,研制了石英基板微带探针与波导之间的过渡结构。结合波导T型分支、波导分支线、波导H面缝隙耦合和波导一分四型的4种波导功率分配/合成器,通过精确的电磁仿真研制了64路功率合成放大器。     

周期极化钽酸锂倍频窄谱线全光纤连续激光放大器特性

通过准相位匹配技术,采用1μm波段高功率窄谱线连续光纤激光放大器抽运高二次谐波转换效率周期性极化晶体,是实现高光束质量、小型化、高功率连续绿光激光器的一个非常有前途的方向。实验自主研发了高效率主振荡功率放大(MOPA)全光纤保偏放大模块,获得中心波长为1064.25nm,线宽为0.035nm的30 W连续线偏振激光,并以此作为基频光抽运国产周期极化钽酸锂(PPSLT)晶体进行了外腔单通倍频实验。保持PPSLT晶体的控制温度为145.6℃,在抽运光功率为21.5W时得到了2.1W的绿光输出。实验分析了温度、基频光功率密度和Boyd-Kleinman聚焦因子对倍频光转换效率的影响。实验过程中没有出现饱和现象,进一步提高抽运功率有望获得更高功率的绿光。     

High Efficiency RF Power Amplifier Designed With Harmonic Real-Time Active Load-Pull

In this work, a high efficiency p-HEMT radio frequency power amplifier (PA) is designed using a new multiharmonic real-time active load-pull using the large signal network analyzer. This technique synthesizes a large set of instantaneous load mismatches to quickly find the optimal harmonic impedances, so as to achieve high PA efficiency in a shortened design cycle. At 2 GHz a demo power amplifier implemented with a p-HEMT demonstrated a power added efficiency (PAE) of 68.5% for 18.0 dBm output power, while achieving a maximum PAE of 75% below the 1 dB compression point for 18.6 dBm output power.     

一种F类宽禁带高效功率放大器的设计

F类功率放大器是一种新型高效率放大器。可用于雷达、通信和电子对抗等领域的末级功率放大器,是现代电子设备高效率、高功率和小型化功率放大器的重要途径。分析了其工作原理和设计方法,并设计了一款S波段高效F类功率放大器,输出功率大于10 W,实际效率达到75%,增益大约12 dB,实测结果验证了仿真设计的有效性。     

磁旋管(综述)简介

磁旋管脉冲功率可达５００－１０００ＭＷ,效率高达６０－８０％,增益３０－６０ｄＢ。结果是一些简单的圆柱腔所组成,工作于旋转的ＴＭ１１０模式。利用圆偏转机构和相对论范围的高速度获得高功率和高效率,属于偏转调制器件,本文综述了磁旋管的参数、结构、工作原理和动力学理论。     

10kW级固体板条激光放大器设计与实验研究

针对传导冷却和端面抽运的激光增益模块特点,设计了一台10kW级高功率全固态板条激光放大器实验装置。分析了激光注入功率密度和入射角度等参数对激光放大器提取效率的影响。实验测试了注入功率密度与激光增益模块光-光转换效率的关系,实验结果与理论分析基本吻合。激光放大器实验装置的种子源通过一级预放大器和两级主放大器放大后获得了高功率和高光束质量的激光输出,激光放大器输出功率达为11.3kW,光束质量7.56倍衍射极限,出光时间110s,光-光转换效率达30%。