小型双频Wilkinson功分器的设计与制作

为了简化双频Wilkinson功分器的总体结构,并减小功分器的整体尺寸,在对奇模-偶模理论深入研究的基础上,利用传输线的双频阻抗变换特性,并在输入端口并联开路微带线,设计出了一个尺寸小,工作在900和2 450 MHz两个RFID频段的功分器。对功分器进行ADS仿真与实际测试,测试结果显示:当其在两个中心频率点时,传输损耗分别为3.20和3.23 dB,隔离度小于-28 dB,各个端口的回波损耗小于-30 dB,测试与仿真结果吻合良好。同时,该实测结果也显示出了功分器在两个RFID频率上具有良好的性能指标,验证了设计方案是可行的,也保证了能够很好地应用于双频RFID系统中。     

Two-Section Cascaded Coupled Line Wilkinson Power Divider for Dual-Band Applications

A coupled line based design method is presented for the dual-band operation of the Wilkinson power divider. It is shown that a simple two-section cascaded coupled line structure is capable of the dual-band operation in the Wilkinson power divider. The overall divider structure can be simplified with the small number of transmission line sections and the coupled line using the proposed approach.     

A Dual-Band Wilkinson Power Divider

A new scheme is proposed for the dual-band operation of the Wilkinson power divider/combiner. The dual band operation is achieved by attaching two central transmission line stubs to the conventional Wilkinson divider. It has simple structure and is suitable for distributed circuit implementation.     

A Dual-Band Out-of-Phase Power Divider

This letter proposes a novel out-of-phase power divider that operates at two arbitrary frequencies. Because of the use of the balanced transmission line, namely the double-sided parallel-strip line (DSPSL), the out-of-phase feature between the two output ports can be made frequency-independent. The power divider employs three lumped components (an inductor L, a capacitor C and a resistor R) in serial connection to achieve isolation between the two output ports. The design equations are derived using the odd-mode and even-mode analysis. Experimental results show that good matching, isolation and amplitude balance are simultaneously achievable for both of the two operating frequency bands.     

Compact and Harmonic Suppression Wilkinson Power Divider With Short Circuit Anti-Coupled Line

A compact Wilkinson power divider using a short circuit anti-coupled line for harmonic suppression is presented in this letter. The structure consists of a pair of anti-coupled line short circuited by a capacitive load realized by a low impedance line. It can offer three finite attenuation poles in the stopband, while arbitrary phase shift can be obtained in the passband. Design procedures have been clearly presented. A 1.8-GHz power divider is designed, fabricated and measured for demonstration. It agreed well with the simulated results. The circuit area of the proposed divider is only 40% of that of the conventional one. Furthermore, the proposed divider has spurious pass-band suppression as high as 20dB.     

A Compact UWB Three-Way Power Divider

A three-way power divider with ultra wideband behavior is presented. It has a compact size with an overall dimension of 20 mm times 30 mm. The proposed divider utilizes broadside coupling via multilayer microstrip/slot transitions of elliptical shape. The simulated and measured results show that the proposed device has 4.77 plusmn 1 dB insertion loss, better than 17 dB return loss, and better than 15 dB isolation across the frequency band 3.1 to 10.6 GHz.     

A New Compact Microstrip-Fed Dual-Band Coplanar Antenna for WLAN Applications

A novel compact microstrip fed dual-band coplanar antenna for wireless local area network is presented. The antenna comprises of a rectangular center strip and two lateral strips printed on a dielectric substrate and excited using a 50 Omega microstrip transmission line. The antenna generates two separate resonant modes to cover 2.4/5.2/5.8 GHz WLAN bands. Lower resonant mode of the antenna has an impedance bandwidth (2:1 VSWR) of 330 MHz (2190-2520 MHz), which easily covers the required bandwidth of the 2.4 GHz WLAN, and the upper resonant mode has a bandwidth of 1.23 GHz (4849-6070 MHz), covering 5.2/5.8 GHz WLAN bands. The proposed antenna occupy an area of 217 mm² when printed on FR4 substrate (epsiv_r=4.7). A rigorous experimental study has been conducted to confirm the characteristics of the antenna. Design equations for the proposed antenna are also developed     

新颖双频Wilkinson功率分配器的研究与设计

通过对三端口都加有微带线的新颖结构功率分配器的研究和理论分析,研制了一款适用于900 MHz射频识别(RFID)和2 140 MHz基站系统的双频段功率分配器。首先根据改进的Wilkinson功率分配器结构,通过奇模-偶模分析理论得出其设计电路参数方程;接着对电路参数方程求解获得具体的设计参数;然后根据设计参数搭建电路进行ADS仿真;最后对设计的功率分配器进行测试和分析。结果表明:设计的双频段功率分配器在工作的两个频段内都具有良好的性能,对两种系统具有实际的应用意义,同时表明奇模-偶模分析理论对设计实际的双频功率分配器具有重要价值。     

A Compact Ka-Band Planar Three-Way Power Divider

A Ka-band planar three-way power divider which uses the coupled line instead of the transmission line is proposed to reduce chip size. The proposed planar topology, different from the conventional Wilkinson power divider, is analyzed and can provide not only compact but also dc block characteristics, which are very suitable for monolithic microwave integrated circuit applications. The divider implemented by a pHEMT process shows an insertion loss less than 5.1 dB and an output isolation better than 17 dB. A return loss less than 18 dB and a phase difference of 4.2deg at 30 GHz can be achieved. Finally, good agreements between the simulation and experimental results are shown.     

采用卷积神经网络的双频功分器优化设计

功率分配器(简称功分器)作为微波电路中常用的射频器件,是构建5G系统多输入多输出(MIMO)馈电网络的重要组成单元。为了对已有固定频率的功分器结构进行重新快速地优化设计,以适用于包括5G工作频段在内的任意实际所需的工作频段,该文以预先设计的一种双频功分器作为优化设计目标,提出了一种基于改进后的一维卷积神经网络的深度学习方案。预测功分器在其他任意双谐振频率处拥有良好性能的几何结构参数,运用自组织映射神经网络进行样本的选取,提高卷积神经网络的训练效率。预测出的功分器在电磁仿真软件中进行验证,仿真结果显示功分器在工作频率处的回波损耗高于20 dB,隔离度高于25 dB,插入损耗低于3.4 dB,工作带宽约为450~600 MHz,证明了利用神经网络实现多参数目标功分器的优化设计是一种快速有效的方法。     

A Dual-Band Unequal Wilkinson Power Divider With Arbitrary Frequency Ratios

This letter presents a theoretically rigorous investigation and experimental verification for an asymmetrical, unequal power divider working at dual frequency bands. Through the even- and odd-mode analysis that can be applied to dual-band, unequal power divider by assuming virtual open and short points, analytically exact solutions have been derived for the design parameters values. For verification of this analysis, commercially available software including ADS and CST MWS based on circuit theory and full-EM theory, respectively, and already-established equations have been adopted.      

新型DGS双频Wilkinson功分器的研究与设计

 本文在多节阻抗变换器基础上嵌入螺旋型缺陷地结构(SP-DGS)以满足功分器所需阻抗和相位条件,从而实现了在两个任选的工作频率上同时具有良好功率传输、匹配和隔离特性的新型功分器设计.该设计的突出优点是所需电抗可由SP-DGS结构精确实现,整个设计过程严密而不失灵活性.最后,采用上述方法设计并研制了一个2.4GHz/5.8GHz双频功分器,工作频带内的最大插损分别是0.1dB和0.4dB,回波损耗和隔离度均优于15dB.     

一种新型小型化功分器

文章提出了一种新的功分器分析方法。该方法利用任意两个隔离端口之间的反射和隔离散射参数,严格推导了任意两个隔离端口应该满足的以Y矩阵表示的约束条件。同时提出了先功分电路,后隔离电路的设计流程,为器件的小型化设计指引了方向。与传统的奇/偶模方法相比,该方法对于非对称功分器提供了更严谨的分析过程。该方法也适用于分析任意端口数、任意端接实阻抗、任意功分比的功分器、正交和180°耦合器设计问题。利用该方法,在微带PCB(印刷电路板)上,制作了一款功分器。通过对比理论计算、全波仿真以及测量结果,表明设计的小型化功分器性能良好。     

应用于WCDMA的双频单片SiGe BiCMOS功率放大器

采用0.18μm SiGe BiCMOS工艺设计实现了一款用于3GPP WCDMA 850/2100(band-I/band-V)的双频单芯片功率放大器(PA)。PA采用单端共射级3级级联的结构,具有带模拟开关的片上偏置电路,通过控制偏置电流对两个PA工作状态进行切换。制造的芯片面积为1.82 mm×2.83 mm,片上集成了开关电路、偏置电路和输入匹配、级间匹配电路。在3.3 V电源电压下测试结果表明,对于band-V(CLR)频段,PA的线性输出功率P1 dB为28.6 dBm,5 dBm输入时,功率附加效率PAE,为34%。对于band-I(IMT)频段,PA的P1 dB为26.3 dBm,PAE为31%。     

Design of a Compact UWB Out-of-Phase Power Divider

The design of a compact out-of-phase uniplanar power divider operating over an ultra wide frequency band is presented. To achieve an out-of-phase signal division over a large frequency range, a T-junction formed by a slotline and a microstrip line accompanied by wideband microstrip to slotline transitions is employed. The simulated and experimental results of the developed divider show a low insertion loss and good return loss performance of the three ports across the band 3.1-10.6 GHz     

一种串联式功分器设计

功分器是微波器件中的基本器件,常见的功分器都是用并联电路来实现,由并联电路的特点可知,当功分比较大时,功分器将存在高阻线,这就增加了加工难度,同时也增大功分器的插损,从而限制了并联式功分器在某些领域的使用。文中提出了一种串联式功分器结构设计,给出了等效电路,并对其进行仿真设计,仿真结果表明此方法是有效的。与Wilkinson功分器相比,串联式功分器工程上能够实现较大的功分比,输出相位差为180°,在超宽带巴仑和平面魔T等方面具有潜在的应用价值。     

宽频比双频Wilkinson功分器的研究与设计

为了实现双频Wilkinson功分器的宽频比特性,并简化设计结构,在研究奇模-偶模分析理论的基础上,提出了一种在输出端口并联开路微带线的新型结构.首先通过奇模-偶模分析理论得出设计电路的参数方程,接着利用Matlab对推导方程进行求解,获得具体的设计参数,从而设计出宽频比(2.0～6.0)的双频Wilkinson功分器.为了验证设计方法的正确性,仿真并且加工了一个工作在870MHz和2140MHz两个基站频率的功分器.测试结果表明:双频功分器在两个工作频段内都具有良好的性能,测试与仿真结果吻合良好,验证了该方法是可行的.     

基于复合左右手传输线小型化功分器的设计

传统的一分多路功分器的隔离网络占用的尺寸较大.根据复合左右手传输线的双曲-线性色散关系可以设计出零相移复合左右手传输线,利用这种传输线来改进传统功分器的隔离网络,可以有效减小整个功分器的尺寸.采用零相移复合左右手传输线来改进三等分功分器的隔离网络,整个功分器的面积比传统的减小了70%,实验结果证明了设计方法的正确性.     

Design and Analysis of Equal Power Divider Using 4-Branch Waveguide

A numerical model of an equal power divider based on the 4-branch single-mode waveguide is proposed. This proposed design does not require extra fabrication process and supplementary structure modification compared to other typical multibranch waveguides. The condition of uniform output power distribution can be easily obtained by adjusting the branching angle between the inner and the outer branches without introducing excess scattering loss. Similar design procedures can also be used when other power dividing ratios or operating wavelengths are specified. In our study, all the four output ports' power is uniform for both TE and TM mode within a difference of less than 0.1 dB. The bandwidth with an output power dividing ratio variation value smaller than 0.3 dB is found to be nearly 350 Å, which is sufficient for wavelength division multiplexing systems where erbium-doped fiber amplifiers are used.     

一种复合巴伦功分器电路的设计

为实现多模信号合成输出,设计了一种复合巴伦功分器电路.文中分析了双层带状线结构,推导出了其特性阻抗计算公式和复合电路的传输矩阵.仿真和测试结果表明,电路具有较好的双模平衡合成性能,同时次模的两个输出实现了180°相移,并在塔康相控阵天线中得到了成功应用.