微波治疗脑瘤用宽带功分器的设计

为了能够在颅内微波治疗脑瘤中,采用分区加热的方式,设计了一种宽带一分二Wilkinson型功分器。这种功分器的工作带宽为0.8G到2.6G,采用三节阶梯阻抗方式。通过对等效电路的阻抗分析,给出设计参数,并基于ADS 软件对其结构进行仿真与优化,根据设计制作了一个功分器并进行了测试。仿真结果和实物测试结果比较接近,该功分器在整个频带范围内具有良好的性能指标,传输损耗低至0.9dB,隔离度高于20dB。该功分器实现了宽带化以及小型化,完全满足颅内微波热疗系统的应用。     

一种基于微带与槽线过渡结构的超宽带功分器

提出了一种基于微带与槽线过渡结构的超宽带180°型3 dB功分器,采用扇形过渡结构替代传统的圆形过渡结构,拓展了功分器的工作带宽。该功分器仿真和测试结果吻合良好,在3.1~10.6 GHz频带内实现了插入损耗小于1.5 dB,两输出口的幅度误差小于0.8 dB,相位误差小于1°,输入端口反射系数小于-12 dB。     

超宽带1:4Wilkinson功率分配器的设计

介绍了WIIkinson功分器的基本设计方法,研制了一种工作频段在2～12 GHz的带状线宽带功分器,采用多节λ/4阻抗变换器级联,实现了功分器频带的展宽.仿真结果和测试结果比较表明,功分器在频带范围内满足良好的性能指标,隔离度在整个频带范围内均在20 dB以上,驻波比小于1.5,输入输出端口均达到良好的匹配.     

一种基于LTCC的宽带一分三滤波功分器

为实现射频系统中微波器件的宽带化、小型化,设计了一款具有滤波性能的功分器。该滤波功分器创新性地将带通滤波器与一分三功分器级联在一个封装器件中,大大减小了体积且解决了阻抗不匹配问题。其中带通滤波器采用四级半集总结构,加入耦合电容版提高滤波性能,一分三功分器采用LC集总结构,实现了小型化。利用ADS软件进行二维仿真,利用HFSS软件进行三维模型的仿真。本文设计的一分三滤波功分器尺寸仅为3 mm×5.6 mm×1.5 mm,工作频带为1.8～2.2 GHz。仿真后的结果为:插入损耗小于7 dB,回波损耗优于19 dB,隔离度优于17 dB,所设计的滤波功分器满足性能要求,且具有小型化高性能的应用优势。     

用于微波组件的LTCC Wilkinson功分器设计

基于LTCC工艺,设计了一种可用于微波组件的新型三维Wilkinson功分器,设计指标为:工作频带介于2.2～2.7GHz,插入损耗<0.5 dB,隔离度>20 dB,驻波比<1.30.使用HFSS软件为该功分器建立了模型并进行了仿真计算.仿真结果表明:该功分器在工作频带内的插入损耗<0.3 dB,隔离度>20dB,驻...     

微带一分五宽带Wilkinson功分器的设计与制作

本文采用Ansoft Designer、Serenade以及HFSS软件进行协同仿真,设计了工作频带在0.7~2.5GHz的微带一分五宽带功分器,根据优化结果制作了器件实物。结果表明:该功分器在整个频带范围内具有良好的性能指标,器件测试结果与仿真结果吻合,适合用于通信、功率分配合成系统中。     

射频宽带Wilkinson功分器的设计

文章设计了一款工作频率为1~3 GHz的射频宽带Wilkinson功分器。该功分器采用3枝节阻抗变换器级连的方式来扩展带宽,利用ADS软件进行设计、仿真、优化,实现了在1~3 GHz的频带内,S21(S31)近似为-3 dB,输入输出反射系数小于-18 dB,隔离度小于-20 dB。     

低成本宽带90°巴伦的研究与设计

提出并设计了一种低成本宽带90°巴伦电路结构,电路由宽带耦合威尔金森功分器、弱耦合线和扇形阶跃阻抗谐振器级联的宽带90°移相器组成。利用电磁仿真软件HFSS对工作在中心频率为1.65GHz 的微带电路进行建模和仿真。采用PCB工艺制作了电路实物并利用矢量网络分析仪进行测试;对比得出仿真与测试结果十分吻合,该巴伦实测相对带宽大于117.0% (0.65～2.58GHz),带内各端口回波损耗好于12.6 dB,输出端口隔离度大于13.1dB,带内插入损耗小于0.5 dB,相位误差小于90°±7.6°。与现有的结构和设计相比,该巴伦不仅具有更大的工作频带和单层电路布局,而且具有容易加工、成本低的优点。     

微带一分五宽带Wilkinson功分器的设计制作

针对功分器被应用于功率放大器、相控阵天线、混频器和多路中继通信机等微波设备中。其性能的好坏直接影响到整个系统能量的分配和合成效率。设计了一种工作频带在0.7～2.5 GHz的微带一分五宽带功分器,根据优化结果制作了器件实物。采用Ansoft Designer、Serenade以及HFSS软件进行协同仿真,仿真结果表明,该功分器在整个频带范围内具有良好的性能指标,器件测试结果与仿真结果吻合,适用于通信、功率分配合成系统中。     

一种宽带紧凑型基片集成径向波导功分器设计

分别设计了一分四和一分八的宽带紧凑型基片集成径向波导（SIRW ）功分器,通过馈电探针的阶梯化方式,使常规一分四和一分八SIRW功分器在回波损耗小于-15 dB条件下的相对工作带宽由原先的6％和15％分别提高至58％和61％,仿真得到的带内插耗分别在-6．25 dB和-9．25 dB以内。为了验证仿真数据的准确性,对一分四功分器进行了测试,测试结果性能良好,满足工程使用要求。     

Broadband Eight-Way Differential SIW Power Divider with Bandpass-Filtering Response Using Novel Hybrid Multiple-via Probe and Multiple Radial Slots

A broadband eight-way differential substrate integrated waveguide (SIW) power divider with bandpass-filtering response by using novel hybrid multiple-via probe and multiple radial slots has been presented in this paper. The novel hybrid multiple-via probe are employed to achieve broadband impedance matching, while the multiple radial slots are used to improve the out-of-band rejection level. An eight-way differential SIW power divider with bandpass-filtering response is designed, fabricated, and measured. The measured results agree with the simulated ones closely in the desirable frequency range. The measured average insertion loss of the eight-way power divider is approximately 9.3 dB and input return loss is greater than 15 dB from 3.2 to 8.1 GHz. Moreover, the out-of-band rejection band with more than 25 dB attenuation from 9 GHz to more than 11 GHz is observed. A maximum amplitude imbalance of \(\pm 0.7\,\hbox { dB}\) is observed over the entire operating frequency range.     

一种带有插值滤波器的8位650MHz采样速率数字模拟转换器

针对OFDM-UWB标准超宽带收发系统中数模转换器(DAC)的要求,设计了一款8位650MHz采样速率电流驱动型数模转换器(Current-steering DAC)。为了提高静态性能,本设计通过蒙特卡洛分析确定电流源最佳尺寸并采用双中心版图技术;为了提高动态性能,文中采用共源共栅电流源结构,对开关电压降摆幅处理并在数字输入端前加入插值滤波器。测试结果表明,DAC的积分非线性(INL)和差分非线性(DNL)分别为0.3LSB和0.41LSB,650MHz转换速率下带内奈奎斯特无杂散动态范围(SFDR)为41dB。整体面积为1.8cm×1.3cm,其中DAC面积为0.8cm×0.8cm。     

2.75-4.75 GHz QPSK modulator with low amplitude and phase errors

A QPSK modulator with a 2.75-4.75 GHz operating frequency range is presented. The modulator is realised using a broadband power divider, microstrip-slotline-microstrip transitions and Lange couplers. Computer optimised matching circuits are used to maintain a phase error less than 5 degrees and an amplitude phase imbalance error across the band of less than 0.5 dB. The modulator is suitable for MMIC implementation.<>     

A Novel Unequal Broadband Out‐of‐Phase Power Divider Using DSPSLs

In this paper, a novel unequal broadband out‐of‐phase power divider (PD) is presented. Double‐sided parallel‐strip lines (DSPSLs) are employed to achieve an out‐of‐phase response. Also, an asymmetric dual‐band matching structure with two external isolation resistors is utilized to obtain arbitrary unequal power division, in which the resistors are directly grounded for heat sinking. A through ground via (TGV), connecting the top and bottom sides of the DSPSLs, is used to short the isolation components. Additionally, this property can efficiently improve the broadband matching and isolation bandwidths. To investigate the proposed divider in detail, a set of design equations are derived based on the circuit theory and transmission line theory. The theoretical analysis shows that broadband responses can be obtained as proper frequency ratios are adopted. To verify the proposed concept, a sample divider with a power division of 2:1 is demonstrated. The measured results exhibit a broad bandwidth from 1.19 GHz to 2.19 GHz (59.2%) with a return loss better than 10 dB and port isolation of 18 dB.     

24-Channel Ku-Band Low-Loss Slotted Waveguide Power Divider

A 24-channel Ku-band power divider for active phased antenna array has been proposed and developed. The divider is built using a tree network with 1×3×2×2×2 structure, while all its elements are implemented using a finline. As a result, additional insertion loss of the manufactured specimen amounted to 1.8 dB that corresponds to the efficiency of about 66%. The measured isolation of the divider outputs amounted to no less than 16 dB for any pair of channels with the irregularity of power division between channels of no more than 0.3 dB in the working frequency range of 9–14 GHz.     

Ka 波段宽带单边带调制器集成电路的设计

基于相移法实现SSB(单边带)调制器理论,设计制造了一种Ka 波段宽带SSB 调制器集成电路。对相移法产生单边带调制信号的原理进行了分析,利用无源电路的3D 电磁仿真分析和ADS 整体电路非线性仿真相结合的方法对调制器进行了优化。设计制造的90°相移电桥网络和同相合成器满足了产生Ka 波段SSB 信号的幅相要求,同时给出了测试结果。调制器在30 ~36GHz 频带内插入损耗臆14dB;载波和对称边带抑制逸15dB;其它边带抑制逸13dB;输入1dB 压缩功率38dBm;外形尺寸18mm×6mm。这种相移法单边带调制器不需要带通滤波器,具有电路简单,载波抑制比高,对相位误差要求不高的优点。     

Broadband dual-polarised antenna with high isolation for wireless communication

A broadband dual-polarised antenna with four end-to-end folded dipoles and a U-shaped ground is presented. Stable and symmetric radiation patterns at slanted ±45° polarisation have been obtained within the band 1.71?2.17 GHz. Measurements show two linear polarisations with an isolation of more than 30 dB over the operating frequency band. A return loss less than 214 dB is achieved and the measured cross-polar level is 23.5 dB below the co-polar level within the above-mentioned band.     

C波段宽带薄膜体声波滤波器设计及验证

介绍了一种适用于三维堆叠的凸点式晶圆级封装的小型化C波段宽带薄膜体声波滤波器的设计方法,并进行了工艺验证。通过对压电层薄膜进行钪掺杂、材料参数提取、结构模型优化实现了相对带宽大于5%的薄膜体声波滤波器设计。通过表面硅基微机电系统(MEMS)工艺制备与凸点式晶圆级封装实现滤波器制备。研制出标称频率5 800 MHz、插入损耗小于2.8 dB、阻带抑制大于40 dBc、体积仅1.0 mm×1.0 mm×0.35 mm的C波段宽带薄膜体声波滤波器。