微型LTCC Wilkinson功率分配器的设计＊

本文提出一种基于LTCC技术的高性能微型Wilkinson功率分配器的设计方法。从Wilkinson功分器的奇偶模阻抗理论出发,将功分器设计转化为在偶模下求解阻抗比为2：1的阻抗变换和在奇模下求解阻抗匹配的问题,采用 LC 阻抗变换节取代传统四分之一波长传输线,减小了功分器体积。通过ADS构建原理图并优化,运用HFSS进行拟合,最后通过LTCC工艺加工制造,实测曲线与HFSS仿真曲线吻合较好,在2.7GHz~3.0GHz的带宽内插入损耗小于3.2dB,隔离度大于20 dB,输入端口反射系数小于-20dB,尺寸仅为3.2mm×1.6mm×0.9 mm。     

基于实频技术的小型化Wilkinson 十八路功分器设计

以工作于100MHz 的Wilkinson 十八路等功分器为设计对象,结合宽带匹配设计方法——实频技术法,设计功分 器阻抗变换节,以达到小型化设计的目的。将实频技术引入阻抗变换节设计,采用集总元件构成的网络结构来取代微带 功分器的四分之一波长阻抗变换节,从而大大缩减了Wilkinson 十八功分器的整体尺寸。根据仿真模型制作了十八等功分 器实物,尺寸仅为10?10cm2,其插入损耗小于13.5dB,幅度波动小于0.2dB,隔离度大于18dB。     

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。     

一种通信用宽频带Wilkinson功分器的优化设计

应用多节阻抗变换原理设计超宽频带Wilkinson功分器,考虑多节阻抗变换段中微带线互耦效应的影响,借助高频仿真软件HFSS对多节阻抗变换段各级的长度和宽度进行优化,多节阻抗变换Wilkinson功分器在0.5～3.5GHz内,输出端口间的隔离度大于20dB,驻波比小于1.4,端口输出的幅相一致性较好,满足大容量通信天线系统的要求。     

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。     

任意耦合度集总宽带正交定向耦合器的研究

本文提出了一种任意耦合度集总宽带正交定向耦合器的分析及设计方法。本文首先从定向耦合器的奇偶模阻抗理论分析出发,得到任意耦合度定向耦合器单元的解算公式,然后通过级联单元定向耦合器得到任意耦合度集总宽带定向耦合器的元件解算公式。经ADS 仿真验证,由解算公式得到的网络其耦合度值与计算结果相一致,级联起来的带宽也比单元定向耦合器的带宽要宽很多。为了进一步验证,本文结尾给出了一个中心频率为445MHz,耦合度值为5dB 的设计实例,测试结果与仿真结果非常吻合。该耦合器有小尺寸,带宽大等优点。     

宽带Wilkinson 功分器综合公式的缺陷与改进

首先介绍了3 种宽带Wilkinson 功分器的综合方法,重点阐述了最为常用的Cohn 的设计方法,并指出 随着功分器节数的不断增加,在利用Cohn 的设计公式计算隔离电阻阻值时会产生负数的问题。为此,通过引入一 个调整参数改进Cohn 的设计公式,实现了节数更多情况下隔离电阻阻值的准确计算。在计算功分器各级传输线特 性阻抗的过程中,提出了一种基于MATLAB 程序的多项式化简方法,实现了任意带宽的切比雪夫阻抗变换器参数的 快速计算。此外,还给出了一个8 级到15 级的功分器设计参数表格,作为对Cohn 给出的设计表格的扩展。最后,利 用改进后的设计公式,设计了一个1 ~15GHz 的宽带Wilkinson 功分器。仿真和测试结果证明了这种方法的有效性。     

一种新型双频Wilkinson功分器的设计

为了实现功分器工作在任意两个频率的目的,设计了一种新型功分器.基于奇偶模分析方法,利用微波网络理论推导了电路参数的设计公式,通过求解相应的非线性方程组获取了具体电路参数.制作了一个工作频率为1GHz和2.6 GHz的双频Wilkinson功分器.实物测试结果表明,该功分器在两个中心频率的传输衰减小于3.3dB,端口回波损耗大于21 dB,端口隔离度大于28 dB,在中心频率100 MHz的通带范围内都具有良好性能,验证了设计方法的可靠性.     

紧凑型高性能L波段Wilikinson三路功分器的设计

提出了一种基于LTCC技术的紧凑型L波段Wilkinson三路功率分配器。对三路功分器进行奇偶模分析,在ADS软件中设计电路,然后在HFSS软件中对该电路进行三维仿真优化。该功分器由LC集总元件组成,以实现更高的隔离度;采用对称结构以降低设计复杂度;使用加载电容和外置电阻以降低元件误差和体积;电阻使用跨接方式以实现低反射损耗。功分器实物测试与仿真结果一致,最终设计的三路功分器尺寸为3.2 mm×1.6 mm×0.89 mm。功分器的中心频率为1250 MHz,带宽为100 MHz,通带插入损耗为4.95～5.05 dB,输入端反射损耗小于-25 dB,端口隔离度小于-25 dB。     

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。     

一种基于内匹配器件的功率分配器设计

介绍了一种基于内匹配功率管的Wilkinson微带功率分配器设计新思路。传统Wilkinson微带功率分配器在低频段体积大,用于内匹配功率管时很难在规定的尺寸范围内使用,采用高介电常数陶瓷基片辐射损耗大,直流转换效率低。适当引入不连续性,提高端口阻抗值,端口阻抗引入的虚部参与后续匹配网络的新型Wilkinson微带功率分配器,与传统Wilkinson功率分配器相比,体积更小,效率更高,有很好的实用价值。设计的工作频段在5.2～5.8 GHz的Wilkinson微带功率分配器,在整个频带内输出功率大于50 dBm,饱和功率增益高于7 dB,功率附加效率大于30%。     

Coupled line power divider with compact size and bandpass response

The design and implementation of a new power divider using coupled microstrip lines are presented. The proposed divider can be considered as an integration of a single-stage coupled line bandpass filter and a conventional Wilkinson divider. The area of the divider layout is compact owing to the small width and spacing of the coupled lines. Two-way and three-way equal power dividers are designed for the bandwidth between 3-5 GHz having a measured power division of -3.2 and -5 dB, respectively.     

Bidirectional radiated circularly polarised square-ring antenna for portable RFID reader

A novel single-layer, dual-fed technique for a bidirectional radiated circularly polarised square-ring antenna operated in the UHF band is presented. The two feed ports of the square-ring radiating element are placed in orthogonal directions and connected to a feeding network with a Wilkinson power divider in the same plane. Properly adjusting the size of the capacitive coupling groundplane results in good impedance matching and circularly polarised radiation, and a broad impedance bandwidth (S₁₁ ⩽ -10 dB) of about 45.2% and a 3 dB axial-ratio bandwidth of about 8.7% were obtained.     

A Parallel-Strip Ring Power Divider With High Isolation and Arbitrary Power-Dividing Ratio

In this paper, a new power divider concept, which provides high flexibility of transmission line characteristic impedance and port impedance, is proposed. This power divider is implemented on a parallel-strip line, which is a balanced transmission line. By implementing the advantages and uniqueness of the parallel-strip line, the divider outperforms the conventional divider in terms of isolation bandwidths. A swap structure of the two lines of the parallel-strip line is employed in this design, which is critical for the isolation enhancements. A lumped-circuit model of the parallel-strip swap including all parasitic effects has been analyzed. An equal power divider with center frequency of 2 GHz was designed to demonstrate the idea. The experimental results show that the equal power divider has 96.5% -10-dB impedance bandwidth with more than 25-dB isolation and less than 0.7-dB insertion loss. In order to generalize the concept with an arbitrary power ratio, we also realize unequal power dividers with the same isolation characteristics. The impedance bandwidth of the proposed power divider will increase with the dividing ratio, which is opposite to the conventional Wilkinson power divider. Unequal dividers with dividing ratios of 1 : 2 and 1 : 12 are designed and measured. Additionally, a frequency independent 180 power divider has been realized with less than 2 phase errors.     

一分二十微带Wilkinson功分器的设计

介绍了一种工作在S频段,一分二十的威尔金森功率分配器的设计方法,20个输出端口为1:1的等功率分配,系统阻抗为50 Ω。使用软件Advanced Design System 2009进行仿真,在2.17~2.20 GHz的工作频率内,表现出良好的电气性能,输入端口反射系数在-18 dB,该功分器的20个输出端口的相位和幅度具有良好的一致性,端口幅度平衡度为±0.3 dB,相位平衡度±2°,输出端口的隔离度在-25 dB以下。     

Miniature Four-Way and Two-Way 24 GHz Wilkinson Power Dividers in 0.13 μm CMOS

This letter presents 24 GHz four-way and two-way miniature Wilkinson power dividers (PDs) in a standard CMOS technology. The chip area is significantly reduced using a lumped-element design, and the effective areas of four-way and two-way Wilkinson dividers are 0.33 times 0.33 mm² and 0.12 times 0.29 mm², respectively. The four-way Wilkinson divider results in an insertion loss <2.4 dB, an input/output return loss better 15.5 dB, and a port-to-port isolation >24.7 dB from 22 to 26 GHz. The two-way Wilkinson divider results in an insertion loss <1.4 dB, an input/output return loss better 8.9 dB, and a port-to-port isolation >14.8 dB from 22 to 26 GHz. To the author's knowledge, this is the first demonstration of 24 GHz four-way Wilkinson PD in a standard CMOS technology.     

从S波段到毫米波段的可重构功分器设计研究

为满足毫米波可重构通信系统需要,文中设计了毫米波可重构威尔金森功分器.首先在S波段设计了基于PIN二极管的可重构功分器电路和原型;然后在此基础上把原理外推到K/Ka频段,通过参数提取方法重点研究PIN二极管寄生参数的影响及其最佳匹配方式;最后设计了K/Ka频段的可重构功分器原型,并进行了仿真和测试.实测结果表明,K/Ka频段可重构功分器在工作带宽内,双路导通模式下端口1到传输端口（端口2和端口3）的插入损耗小于4.92 dB,传输端口之间的隔离度大于15.8 dB;单路导通模式下插入损耗小于1.65dB,端口1和隔离端口之间的隔离度大于22.4 dB,实测结果与仿真结果基本一致.使用场路联合仿真的方法基于PIN二极管设计可重构功分器,在K/Ka频段考虑寄生参数的影响,设计的可重构功分器模型准确、结构简单,适合可重构系统应用.     

Miniaturized Wilkinson power dividers utilizing capacitive loading

The authors report the miniaturization of a planar Wilkinson power divider by capacitive loading of the quarter wave transmission lines employed in conventional Wilkinson power dividers. Reduction of the transmission line segments from λ/4 to between λ/5 and λ/12 are reported here. The input and output lines at the three ports and the lines comprising the divider itself are coplanar waveguide (CPW) and asymmetric coplanar stripline (ACPS), respectively. The 10 GHz power dividers are fabricated on high resistivity silicon (HRS) and alumina wafers. These miniaturized dividers are 74% smaller than conventional Wilkinson power dividers, and have a return loss better than +30 dB and an insertion loss less than 0.55 dB. Design equations and a discussion about the effect of parasitic reactance on the isolation are presented for the first time     

Broad-banding technique for in-phase hybrid ring equal powerdivider

A broad-banding technique for in-phase equal power divider is described. Detailed comparisons between the proposed variants of power dividers and the conventional in-phase power divider are also performed. Based on the 15-dB input and output return losses criteria, it is noted that a maximum impedance bandwidth of 44.3% for an amplitude error of ±0.9 dB and a phase error of ±1.8° can be achieved, for the first time, for divider with length more than 3λ/2 ring impedance transformer. A systematic design technique that relaxes some of the conventional constraint in in-phase hybrid ring equal power divider design, is also described