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.     

新型小型化超宽带功率分配器

利用长为四分之一波长、两端交叉短路的对称耦合微带线和长为四分之三波长折叠微带线并联结构,提出一种新型小型化超宽带功率分配器.在等效传输线模型的基础上,采用奇偶模分解方法对其进行了理论分析,给出了参数设计方程.利用HFSS仿真优化一个微带结构的超宽带功率分配器.仿真和测量结果表明,通带内插入损耗小于2 dB,输入输出端口...     

一种高选择性的宽带滤波功分器

为了实现无线通信系统的小型化,设计了一种同时具有滤波和功分功能的器件.将传统Wilkinson功分器中的两个四分之一波长传输线替换为两个具有带通响应的滤波器.同时,为了实现两个端口之间良好的隔离,将一个电阻安放在两个输出端口之间.利用奇偶模的分析方法,推导出了该滤波功分器的设计公式.实验结果表明,该器件的3 dB带宽达到了62%,在低频段和高频段的抑制度分别达到了38.4 dB和31.4 dB（2.67f₀）,该器件非常适用于小型化无线通信系统.     

功耗低、结构紧凑的吞吐脉冲式分频器

本文设计了一个功耗低、结构紧凑的吞吐脉冲式多模分频器电路。为了节省功耗,除2/3双模预分频器中的一个D触发器受模式控制信号MC的控制,在特定模式下能自动关闭。可编程计数器和吞吐脉冲计数器中的D触发器共享以构成紧凑的结构进一步减小功耗。所设计的多模分频器采用标准65nmCMOS工艺实现,面积为28umX22um.当工作频率为988MHz时,1.2V电源电压下的分频器功耗为0.6mW。     

Waveguide to microstrip line transition and power divider

A novel waveguide to microstrip line transition and power divider with a planar structure is presented. The transition and power divider is designed on both sides of a single layer dielectric substrate, and can be used as a feed of an array antenna with a waveguide feed structure or as a complete integration of waveguide components with active components such as MMIC. Experimental results are shown and compared with simulations; it is shown that good return and insertion loss characteristics are obtained for the K-band     

Electric-magnetic-electric slow-wave microstrip line and bandpass filter of compressed size

This paper presents a novel integrated microstrip low-loss slow-wave line. The new microstrip replaces the conventional metal strip by composite metals paralleling the electric surface and magnetic surface (MS). The MS made of an array of coupled inductors shows a high-impedance state in the stopband, below which the propagation properties can be well controlled by varying the dimensions of the electric surface and MS. The dispersion curves obtained by matrix-pencil analyses closely correspond to those obtained by scattering-parameter extraction. Theoretical results, as confirmed experimentally, indicate that an increase of over 60% in the slow-wave factor can be achieved without sacrificing propagation losses, using the proposed structure. This electric-magnetic-electric (EME) microstrip is insensitive to the alignment position of the periodical structure, and can be constructed using conventional printed-circuit-board fabrication processes and integrated with other microwave components in a multilayered circuit. A compact EME bandpass filter (BPF) with suppressed harmonic responses is presented. The length of the filter is reduced by 26%, and the measured insertion loss and fractional bandwidth is comparable to that of a conventional microstrip BPF on the same substrate.     

Taper transmission line UWB Wilkinson power divider analysis and design

This paper proposed, analysed and fabricated an ultra-wideband Wilkinson power divider. This proposed power divider contains two parts, namely the transmission lines with fixed characteristic impedance and the tapered transmission line.

The power divider has a fixed architecture with the ability to broaden for different bandwidths by changing its circuit parameters including resistors and impedances. It also can create a bandwidth of about 40 GHz with a smaller physical dimension and fewer numbers of resistors.

The proposed power divider is investigated using the even/odd analysis method in order to compute equations required for designing power divider.

The proposed power divider was designed and fabricated for the 3-11 GHz ultra-wideband range. Then, the results are compared with the simulated results and a good agreement is obtained consequently. Furthermore, input return loss better than 12dB, output return loss better than 15dB, insertion loss better than 4.8dB and output ports isolation less than 12 dB are achieved by measured results. The overall size of the proposed power divider is 14.2 × 4.8 mm².     

Dual-frequency power divider with isolation stubs

A novel dual-frequency power divider with isolation stubs is presented. To reduce the parasitic effects between the two stubs that are connected by the isolation resistor in traditional Wilkinson power dividers, a structure consisting of isolation stubs is proposed. The corresponding design equations are obtained to calculate the design parameters of the desired dual-frequency power divider. Finally, this design concept is validated by experimental results on a 0.95/2.09 GHz dual-frequency power divider.     

Novel compact parallel-coupled microstrip bandpass filters with lumped-element K-inverters

Novel compact parallel-coupled microstrip bandpass filters are proposed by using additional lumped inductors to realize K-inverters between coupled-line sections to achieve an equivalent to the quarter-wavelength (/spl lambda//4) resonator filters. As a result, the filter order can be doubled without increasing the circuit area, and no repeated passband is observed at twice the center frequency. In addition, by introducing the cross-coupling effect, two transmission zeros at upper and lower stopbands may be created. Simple equivalent-circuit models are also established as effective design tools. Specifically, several compact fourth-order microstrip bandpass filters with good stopband rejection are implemented and carefully examined.     

A novel microstrip square-loop dual-mode bandpass filter with simultaneous size reduction and spurious response suppression

In this paper, a new capacitively stepped-impedance resonator(CSIR) is proposed to develop the microstrip square-loop dual-mode bandpass filter. Using this new design, simultaneous size reduction and spurious response suppression for the dual-mode bandpass filter can be achieved. An analytical formulation of this novel resonator is given in order to elucidate the spurious frequencies relocation design. Together with this formulation, a generalized dual-mode bandpass filter model is developed so as to ease the analysis of transmission zero and insertion loss. A prototype filter is designed at 900MHz with 1.5% fractional bandwidth. Significant spurious suppressions up to 33 and 35 dB are measured at 1.8 and at 2.7 GHz, respectively. A circuitry size reduction of 54% is achieved when compared with that of the conventional structure. Moreover, the CSIR allows frequency tuning and, thus, a varactor-tuned filter is designed and a measured tunable center frequency between 1.5-1.62GHz is demonstrated. Utilizing the proposed structure, not only size reduction,as well as spurious response suppression, but also center frequency tuning can be achieved.     

Improved and compact 0.7 GHz tune-all bandpass filter

A compact tune-all bandpass filter is presented. This electronically tuned filter is based on series-coupled slow-wave resonators. It allows wide simultaneous and continuous tunings of centre frequency (+/-15% around 0.7 GHz) and bandwidth (from 50 to 100 MHz) with insertion loss IL<5.4 dB and return loss RL>11 dB. This two-pole bandpass filter exhibits also a very small surface of only 7.3times10^-3 lambda₀ ² and a -20 dB stop-band that extends up to 10 GHz     

A wideband compact parallel-strip 180/spl deg/ Wilkinson power divider for push-pull circuitries

A Wilkinson power divider with a differential output implemented in parallel-strip-line (PSL) is proposed. Taking full advantages of the PSL technology and a three-stage cascaded design, more than 170% impedance and isolation bandwidths are obtained. Inherent to the PSL structure, the 180/spl deg/ differential output is frequency-independent. A class-B push-pull power amplifier employing the devised concept is designed, showing a peak efficiency of 44% over a 4-GHz bandwidth. Without exploiting any extra and external low-pass filters, the proposed design can produce startling second-harmonic suppressions (more than 50dB) over the whole working dynamics and operated bandwidth.     

A novel couple-type power divider with large-angle low-losscharacteristics

A novel large-angle low-loss direction-coupler type power divider with designed ratio between output waveguides is proposed. The radiation loss is greatly reduced by using a micro-prism at the bend corner to compensate the phase mismatch due to bending. A normalized transmitted power of the power divider with a bend angle of 10° simulated by the semivectorial beam propagation method is about 93%, which is much larger than those were reported for single-mode waveguides. Application of more micro-prisms is also shown. The calculated loss of a symmetric large-angle 3-dB directional coupler with eight micro-prisms is less than 0.953 dB     

Low-loss and compact V-band MEMS-based analog tunable bandpass filters

This paper presents compact V-band MEMS-based analog tunable bandpass filters with improved tuning ranges and low losses. For compact size and wide tuning range, the two-pole filters are designed using the lumped-elements topology with metal-air-metal (MAM) bridge-type capacitors as tuning elements. Capacitive inter-resonator coupling has been employed to minimize the radiation loss, which is the main loss contributor at high frequencies. Two filters have been demonstrated at 50 and 65 GHz. The 65-GHz analog tunable filter showed a frequency tuning bandwidth of 10% (6.5 GHz) with low and flat insertion losses of 3.3 /spl plusmn/ 0.2 dB over the entire tuning range.     

Spurious harmonic suppression in compact coupled-line bandpass filter with asymmetric perturbations

ABSTRACT

Present article exhibits the design of a third-order compact parallel-coupled line bandpass filter at 5.25 GHz having asymmetric perturbations to suppress the second harmonic. Initially, the effects of compactness on filter characteristics have been studied by synthesising the distributed filter network into its equivalent circuit model. The design has been initiated by computing the unit cell model, which leads to the first-order and third-order design instances with an improvement in compactness over the traditional parallel-coupled line filter. In contrary, compactness in the filter characteristics degrades the second harmonic level subject to enhanced imbalances among the odd- and even-mode velocities at the coupled lines. Subsequently, the improvement in the harmonic suppression of 53 dB and 58 dB has been achieved by incorporating different non-uniform perturbations to the outer and coupled edges of the compact filters. Accordingly, compactness of 58% and 71% have been obtained subject to the folded and in-line designs over the conventional layout.     

高功率低损耗六路功分器的设计与分析

针对高功率微波对功率放大器轻重量和小体积的要求,采用基于功率分配合成技术中的同相叠加原理,设计了一种C波段的结构紧凑型窄带6路功率分配器。该分配器通过射频同轴N型连接器输入射频信号,通过环形无氧铜窄带线等相均分为6路。利用CST软件对该器件进行了初步结构优化设计和S-parameter模拟仿真,理论传输系数为-7.78 dB。结果表明,该器件能承受5.0~5.3 GHz的工作频率,功率容量达到1 000 W,各端口的功率传输效率达到97.5%以上,插入损耗为0.2 dB以内,完全可以满足使用要求。     

220kV电网紧凑型线路的带电作业

进入21世纪,我国工业的发展取得了辉煌的发展成就,但是工业的发展要得到电力的保障,尤其是为了不影响正常的工业生产就要求在保障输电线路正常工作的情况下完成带电作业。本文正是对220KV电网紧凑型线路的发展背景以及研究分析了传统进入电场作业的方法,并且根据220KV紧凑型电网线路进入电场的难点研究出了新的进入电场带电作业的方法,对于在这种线路上带电作业有一定的帮助。     

Miniaturized Gysel power divider with nth harmonics suppression

In this paper, a miniaturized Gysel power divider with n^th harmonic suppression has been presented. The Gysel power divider retains its capability of high-power handling, while extreme size reduction makes it suitable for application in small-sized circuits with higher order harmonics rejection. A lowpass filter with high performance and appropriate characteristic has been placed instead of the conventional transmission lines a quarter wavelength. It results in the size reduction and harmonics rejection of the Gysel power divider, effectively. The presented Gysel power divider operated at center frequency of 0.764 GHz with fractional bandwidth of 36%. To substantiate the validity and efficiency of the proposed circuits, the designed power divider was fabricated and measured. It is seen that the results of the measurements and simulations are highly consistent together. The main frequency; the return loss of the port 1, the return loss of the port 2, isolation, and insertion loss are 28, 29, 32 and 1.3 dB, respectively. The overall circuit size is 22.1 mm × 65.7 mm.     

幅度固定唯相位实现波束控制的功分器设计

针对传统阵列天线设计流程中功分器繁琐的设计过程, 基于满足-3 dB范围为0°~12°, -10 dB波束宽度为65°, 波束覆盖为65°, 中心频率为9.05 GHz的余割平方扩展波束赋形要求, 设计了一种幅度固定唯相位实现波束控制的新型串馈结构Gysel功分器.该功分器幅度为固定值, 此幅度分布满足余割平方赋形阵列天线幅度的分布特征, 在遗传算法计算出理想赋形激励后只需调整该功分器的输出相位值就能实现高拟合度的余割平方扩展波束赋形, 大为减少了传统设计中功分器所需的设计时间.     

Microwave photonic filter with single bandpass response

A new microwave photonic filter that solves the problem of realising a single bandpass RF response is presented. The filter is based on using phase modulation together with a pair of gratings, and eliminates the baseband response and periodic spectral response of typical FIR filters. Experimental results demonstrate a single passband square-type bandpass filter response, and operation to high frequencies.