基于遗传算法的N路双频功率分配器设计

提出了采用遗传算法对N路双频功率分配器进行优化设计.N路双频功率分配器的结构由N个两节阻抗变换器和N个隔离电阻组成.首先,对功率分配器电路的理想传输线模型进行偶-奇模分析,并在遗传算法中加入最优保持操作、变概率的交叉和变异操作,解决遗传算法早熟收敛的问题,避免复杂的公式推导,快速、高效地得到优化结果.使用射频仿真软件ADS,对得到的器件结构参数进行仿真分析.结果显示,所有端口均具有良好的匹配,隔离度满足应用要求.     

缺陷地结构在不等分威尔金森功分器中的应用

本文提出了一种基于DGS(Defected Ground structure)的不等功分威尔金森功分器的设计,实现了1GHz-2GHz频段内不等功分比为1：5 。由于加工工艺的限制,微带线的特性阻抗最高只能做到120Ω-130Ω。在接地板上的DGS引入了附加的等效电容和等效电感,这样使得微带线能够实现高于180Ω的特性阻抗。本文针对未加载DGS 和加载DGS 的威尔金森功分器均做了HFSS 仿真,均实现了1：5 的功分比。     

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。     

多端口功率分配器S参数的计算机分析

本文给出复杂网络任意端口连接理论，从而可以方便地进行多端口功率分配器的Ｓ参数计算机分析，理论计算与实测结果作了比较，这一理论也适用于其它多端微波元件的分析。     

多路不等分径向波导功率分配器

根据径向波导传输线理论,提出了一种基于多圈多路功率分配网络匹配级联的多路不等分功率分配器设计方法;并利用径向波导场结构特性和多探针耦合原理,实现了一种多路不等分功率分配器,该结构具有低损耗、高精度性能,且可实现所需的端口相位和幅度一致性.作为验证,文中实现了一个L波段19路不等分功率分配器,电磁仿真和测试结果表明,内圈7路幅相不平衡度分别小于0.1dB和0.4°,外圈12端口幅相不平衡度分别小于0.3dB和1.8°.测试与仿真结果比较吻合,验证了该分析方法的正确性与可行性.     

高分配比不等分功率分配器的设计与仿真

在传统微带线Wilkinson型功分器难以实现大分配比的情况下,通过引入改善因子c的方法降低过大的特性阻抗,并通过T型结构代替特性阻抗过小的四分之一波长传输线,使最终的电路结构用传统的平面微带线结构易于实现。应用这些设计方法计算出功分比为5：1的不等功分器的各段阻抗最大和最小之比仅为2．7：1,较传统结构得出的比值5．5：1有了很大改善。最后,利用ADS软件设计出一个中心频率为1.3GHz的微带5：1不等分功分器,仿真结果证明了这种设计方法的有效性和可行性。     

一种微带混合型功率分配器的设计

介绍了微带任意分配比的混合型功率分配器的设计原理及关键技术，着重描述了研制出的一种微带混合型2路功率分配器的设计和性能，并给出了它的性能测试结果。通过这种方法，可设计出任意比的混合型2路功率分配器，通过级联的方式还可得到任意比的混合型多路功率分配器。     

一种宽带十六路功率分配器的设计方法

本文讨论了一个倍频程的4-8GHz的十六路功率分配器（简称功分器）的设计方法。采用2节四分之一波长阻抗变换线的带状线结构,利用仿真软件建立模型,把2路功分器作为子模型,引入16路功分器模型,进行优化仿真和调整,得到理想参数值,并进行电路布局,大大的提高了设计效率。功分器封装盒体约165mm×48mm×8mm,体积小、重量轻。在整个频带内插入损耗小于1.4dB,驻波比小于1.5,隔离度达到20.5dB,幅度不平衡度小于0.6dB,相位不平衡度小于5°,满足设计需要。该设计方法适用于倍频程带宽的多路功分器的设计制作,有很好的实用性和推广性。     

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.     

Design and analysis of a 3-way unequal split ultra-wideband Wilkinson power divider

In this article, a 3-way ultra-wideband (UWB) unequal split Wilkinson power divider (WPD) using tapered line transformers is presented. Three tapered lines are designed through the even-mode analysis, and used instead of the conventional 3-way WPD arms. In addition to the three main arms, three additional tapered transformers are used to match the output ports to the 50?Ω connectors. To achieve an acceptable output ports matching and isolation, multiple resistors are uniformly distributed and mounted between the three tapered arms of the WPD. An optimisation process is carried out to obtain the values of these resistors considering the odd-mode analysis. The proposed WPD is designed to operate over the frequency band of 2–12?GHz, and simulated using two full-wave EM simulators. Full-wave simulation and experimental results verify the design procedure.     

A 4.1 unequal Wilkinson power divider

This letter presents the design and measured performances of a microstrip 4:1 unequal Wilkinson power divider. The divider is designed using the conventional Wilkinson topology with the defected ground structure (DGS). The DGS on the ground plane provides an additional effective inductive component to the microstrip line. This enables the microstrip line to be realized with very high impedance of over 150 Ω. By employing the DGS to the unequal Wilkinson topology, 4:1 power dividing ratio can be obtained easily without any problem in realization, while it has been impractical to fabricate a 4:1 divider using the conventional microstrip line because of very thin conductor width and extremely low aspect ratio (W/H). As an example, a 4:1 divider has been designed and measured at 1.5 GHz in order to show the validity of the proposed DGS and unequal divider. The measured performances of the 4:1 unequal power divider well agree with the exactly same dividing ratio as that expected     

An ultra wideband Wilkinson power divider

The challenge facing SerDes (Serialiser De-Serialiser) designers is common with all current communications technologies. Industry advances show a trend to increase speed, reduce power and improve efficiency. In this article a novel line driver that can operate at speeds of up to 40 Gbps with a power supply of 1?V and a power consumption of 4.54?mW/Gb/s is presented. Pre-distortion on the front-end is used to maintain signal integrity.     

带状线宽带Wilkinson一分四功分器的设计

研究并设计了一种带状线宽带Wilkinson一分四功分器,实验结果显示,该功分器在6GHz～14GHz的宽频带范围内性能良好,其隔离度在整个频带范围内大于35dB,同时输入与输出端口均实现了良好的匹配且各输出口幅度相位一致性良好。     

集总元件宽带Wilkinson功分器的研究

提出了一种集总元件宽带Wilkinson功分器的分析及设计方法。从功分器的奇偶模阻抗理论分析出发,将功分器设计转化为在偶模下求解阻抗比为2:1的宽带阻抗变换和在奇模下求解宽带阻抗匹配的问题,采用LC阻抗变换节取代传统电路的λ/4传输线,减小功分器体积,并推导出两级功分器的元件解算公式。经ADS仿真验证,由解算公式得到的两级功分器,在760～1240MHz的带宽内功率分配损耗小于0.1dB,隔离度大于20dB,输入输出端口反射系数均小于-20dB,可用带宽fH/fL为1.64,实现了Wilkinson功分器小尺寸、带宽大的优点。     

宽带Wilkinson功分器的设计仿真与制作

利用Ansoft公司的HFSS软件对设计宽带Wilkinson功分器模型进行仿真,制作出了工作频带为0.8～2.5 GHz,尺寸为4.0 cm×3.0 cm×0.5 cm的宽带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<0.8 dB,隔离度>20 dB,该功分器实现了宽带化以及小型化。由于其工作频率处于ISM频段内,因此可广泛应用于GPS、蓝牙等通讯系统中。     

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。     

A production insensitive compact power divider

Power dividers are inevitable components in most microwave systems. Well known topologies like Wilkinson power divider are widely studied in the literature. An “all 50 ohm power divider” is another topology presented in the some works. In this study, an all 50 ohm structure is taken as the basis and a compact-easy to implement modification the power divider is proposed. A sample structure is designed, implemented and measured to prove the topology. The decreased sensitivity to production tolerances is demonstrated by various design modifications. Comparisons with well-known topologies are given for reference.     

A miniaturized dual band Wilkinson power divider using capacitor loaded transmission lines

A miniaturized dual band Wilkinson power divider (WPD) with an ultra wideband harmonic suppression is proposed, in this paper. Capacitor loaded transmission lines (CLTL) are used in the proposed circuit. The proposed WPD has a significant size reduction more than 80% compared to a primary power divider. In the design procedure, values of the impedances and electrical length for all of the applied transmission lines and also applied lumped capacitors are analytically obtained. Results of fabricated power divider have a good agreement with simulated and show that, the insertion loss at two operating frequencies of 0.9 and 1.8 GHz are less than 0.1 dB and also a wide range of unwanted harmonics (3.1–10.6 GHz) has been achieved.