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。     

基于微印多层技术的小型化功分网络设计

论述了基于微波多层印刷技术的小型化功分网络设计。微波多层印刷技术是一种较新的工艺技术,该技术能兼顾微波电路性能和小型化设计。本文以一分八小型化功分网络设计为例,介绍其仿真设计方法,并给出实测结果。该功分网络在4层微波板基础上,设计实现一分八功分器,在大大缩小电路体积基础上,获得良好的微波性能。     

新型微带三路功分器及其散射特性分析

提出了一种微带三路功分器结构,由12段1/4波长微带线和两个隔离电阻组成,通过调整各传输线特征阻抗可实现不同功率分配比.应用多端口网络级联方法对其散射参数进行分析并得到了近似表达式,采用数值优化方法结合电磁软件仿真设计了工作于2.4GHz,具有不同功分比的三路功分器.仿真及实测结果表明:该新型功分器可在超过25%相对带宽内实现各端口回波损耗-16dB,功分端口间隔离度20dB,功分比误差±0.5dB.功分器结构简单紧凑,适用于微波混合电路和微波集成电路.     

一种Ka波段三路波导功率分配/合成器的设计

提出了一种波导三路功分器结构,该功分器采用E面T型缝隙耦合结构来实现功分比的调节。通过调节耦合缝隙以及感性膜片,使输入阻抗匹配并且实现等功率同相位的三路功分输出。为了实现功率合成,采用对称的两个三路功分器进行背靠背级联实现功率合成网络,仿真结果显示出良好的驻波效果和极低的插损。最终对加工出的实物进行测量,在32.5~36 GHz频段内实现了输出功率幅度不平衡度小于0.5 dB的良好效果。通过背靠背连接两个功分器实现了在33.3~35.3 GHz带宽内插损小于0.3 dB的功率分配/合成网络。     

X波段相控阵天线馈电网络的功分器设计

本文介绍了用耦合器来实现累进制功分网络的设计方法．试制了一个工作于x波段的带状线功分器,并给出了实验结果。     

1～18 GHz超宽带功分器的设计

分析了1~18GHz超宽带一分二功分器的制作难点,设计了两种不同结构的威尔逊功分器。通过ADS和HFSS的共同仿真,选择了性能较好的功分器进行加工制作,最后所设计的1~18GHz超宽带一分二功分器的测试结果表明,在1~18GHz的整个频带内,功分器的回波损耗都在-15dB以下,两端口的隔离度大于20dB,性能良好,可以应用于超宽带系统中。     

MEMS微同轴宽带功分器

随着微波系统大功率、超宽带的发展,对功率分配/合成结构的性能提出了更高的要求,超宽带、低损耗、小尺寸、易于集成的功分器成为研究热点.基于微电子机械系统(MEMS)工艺的微同轴射频传输线具有超宽带、无色散、低损耗和高隔离度等特点,使用微同轴工艺制备的功分器具有超宽带、低损耗、易于集成、小型化和可移植性好等特点.仿真并制作...     

基于平面埋阻工艺的Wilkinson功分网络设计

针对低剖面易集成的功分网络需求,介绍了一种基于平面埋阻工艺的K频段(19.5～21.5 GHz)的Wilkinson功分器的设计与测试方法。设计中采用埋入式Ni-P电阻材料,通过电阻层与带状线中间层集成,减小功分网络厚度。通过优化仿真,加工了一款1分16平面埋阻Wilkinson功分网络。测试夹具与功分网络的互联采用毛纽扣弹性压接方式,实现射频信号垂直互联。经测试验证,此网络的幅相均方根误差分别控制在0.4 dB和5°以内,实际插入损耗可控制在14 dB以内。     

一种微带结构的新型不等分功分器设计

为了满足天线阵波束赋形对各单元天线输入功率不等分配的要求,基于Wilkinson功率分配器设计理论,详细推导并给出了任意功分比情况下隔离电阻的计算公式,补充了目前参考资料中对于直接多路输出功分器的设计指导。通过引入二分之一波长微带传输线,提出了一种微带结构的新型不等分功率分配器的设计方法。基于此方法,实现了一款应用于海事卫星通信天线阵馈电网络的功分比为1∶2∶1的三路不等分功分器。仿真和实测结果表明,功分器在工作频带范围内具有良好的性能指标。     

一种小型化电调功分器设计

该文提出了一种等功分电调功分器。该功分器基于传输线变换技术进行设计,利用变容二极管调节功分器的中心频率,实现了从900～1050MHz的中心频率调节范围,在可调范围内实现S11小于-20dB。S21、S31大于-3．2dB,S23小于-22dB。该功分器具有尺寸小,偏置电路简单的优点。     

Ultra-wideband (UWB) power divider with filtering response using shorted-end coupled lines and open/short-circuit slotlines

A novel ultra-wideband (UWB) power divider with bandpass-filtering frequency response has been presented. The shorted-end coupled lines and the open/short-circuit slotlines are introduced to this presented power divider. An isolation resistor R is located across the slotline for improving the isolation between the output ports of the power divider. Based on even and odd mode analysis, an analytical model of the presented power divider structure has also been proposed. An UWB power divider with passband response has been designed, fabricated, and measured. The measured results verify the predicted attractive features. It can be seen that the presented UWB power divider can not only divide/combine the power of microwave signals, but also reject unwanted frequency signals to better regulate the UWB performance.     

Low-power wide-locking-range injection-locked frequency divider for OFDM UWB systems

This paper describes a divide-by-two injection-locked frequency divider (ILFD) for frequency synthesizers as used in multiband orthogonal frequency division multiplexing (OFDM) ultra-wideband (UWB) systems. By means of dual-injection technique and other conventional tuning techniques, such as DCCA and varactor tuning, the divider demonstrates a wide locking range while consuming much less power. The chip was fabricated in the Jazz 0.18 μm RF CMOS process. The measurement results show that the divider achieves a locking range of 4.85 GHz (6.23 to 11.08 GHz) at an input power of 8 dBm. The core circuit without the test buffer consumes only 3.7 mA from a 1.8 V power supply and has a die area of 0.38 × 0.28 mm2. The wide locking range combined with low power consumption makes the ILFD suitable for its application in UWB systems.     

Novel Ultra-Wideband (UWB) Multilayer Slotline Power Divider With Bandpass Response

A novel ultra-wideband (UWB) multilayer slotline power divider with bandpass filtering response is presented. In the proposed structure, a single isolation resistor is properly placed between the two output ports. Based on the transmission-line equivalent-circuit method, the design equations of the proposed UWB power divider has been derived with the even and odd mode analyses. Experimental results show that excellent impedance matching at all three ports, amplitude and phase balance at the two output ports, isolation between the two output ports, and out-of-band rejection are observed at the UWB band.      

一种基于天牛须算法的新型超宽带功分器研究

根据对马刺线的原理分析,该文提出一种新型马刺线结构,并在此基础上设计出一种新颖的超宽带功分器(频率范围为2.5～13.2 GHz)。该超宽带功分器尺寸较小,制作结构简单,带内传输特性好,输入与输出端口的回波损耗均小于–12 dB,带内插入损耗小于3.5 dB。在设计过程中,根据理想传输线模型,利用奇偶模分析方法,推导出设计的目标函数,并利用天牛须算法对其进行优化设计,有效提高了功分器的设计准确性和灵活性。为了验证设计的准确性,采用材料RO4003C作为基板设计超宽带功分器。实验结果表明,采用新型马刺线结构的超宽带功分器结合天牛须算法有效缩短了计算时间,提高了设计精度,可以广泛运用于超宽带功分器设计。     

Ultra-Wideband Power Divider With Good In-Band Splitting and Isolation Performances

An ultra-wideband (UWB) power divider on microstrip line is proposed, analyzed and designed. This divider is formed by installing a pair of stepped-impedance open-circuited stubs and parallel-coupled lines to two symmetrical output ports. In addition, a single resistor is properly placed between two output ports. After simple transmission line theory analysis, it is demonstrated that 3 dB power splitting from one input to two output ports, good impedance matching at all the three ports and excellent isolation between two output ports are achieved over the specified 3.1–10.6 GHz UWB range. Finally, a prototype divider is fabricated and measured to provide an experimental verification on the predicted attractive features.      

Compact Dual-Band Equal Power Divider Circuit for Large Frequency-Ratio Applications

A novel design of compact dual-band equal power divider circuit for large frequency-ratio (greater than 3) applications is proposed in this paper. Topology of the circuit consists of two-section transmission-line transformers and a series RLC network for isolation. This power divider provides an equal power-dividing at two arbitrary frequencies which feature high center frequency-ratio. Besides, this power divider achieves good port matching and isolation. Theoretical derivations are presented and verified by measuring a 3-dB microstrip power divider operating at both 1 GHz and 4 GHz.     

High-performance filtering power divider based on air-filled substrate integrated waveguide technology

A filtering power divider based on air-filled substrate-integrated waveguide (AFSIW) technology is proposed in this study. The AFSIW structure is used in the proposed filtering power divider for substantially reducing the transmission losses. This structure occupies a large area because of the use of air as a dielectric instead of typical dielectric materials. A filtering power divider provides power division and frequency selectivity simultaneously in a single device. The proposed filtering power divider comprises three AFSIW cavities. The filtering function is achieved using symmetrical inductive posts. The input and output ports of the proposed circuit are realized by directly connecting coaxial lines to the AFSIW cavities. This transition from the coaxial line to the AFSIW cavity eliminates the additional transitions, such as AFSIW-SIW and SIW-conductor-backed coplanar waveguide, applied in existing AFSIW circuits. The proposed power divider with a second-order bandpass filtering response is fabricated and measured at 5.5 GHz. The measurement results show that this circuit has a minimum insertion loss of 1 dB, 3-dB fractional bandwidth of 11.2%, and return loss exceeding 11 dB.     

The Traveling-Wave Divider/Combiner

A new kind of distributed power divider/combiner circuit for use in octave (or more) bandwidth microstrip power transistor amplifiers is presented. The design, characteristics and advantages are discussed. Experimental results on a four-way divider and divider/combiner are presented and compared with theory. First experimental results on a six-way traveling-wave divider (TWD) are also presented.     

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.