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 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.     

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.     

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 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     

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.     

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 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.      

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.     

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     

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.     

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.     

Ka-band Wide-Isolation-Bandwidth Waveguide Power Divider Using Microstrip-Probe Isolation Circuit

Journal of Infrared, Millimeter, and Terahertz Waves - A Ka-band wide-isolation-bandwidth waveguide power divider using a microstrip-probe isolation circuit is proposed in this paper. A novel...     

Design of the Compact Dual-Band Bandpass Filter With High Isolation for GPS/WLAN Applications

In this letter, a novel compact dual-band bandpass filter (BPF) is designed to achieve the characteristic of low insertion loss and high isolation for global position system (GPS)/wireless local area network (WLAN) applications. This BPF is implemented by properly selecting the impedance ratio (R) and physical length ratio $(alpha)$ of the asymmetric stepped-impedance resonator (SIR) with one step discontinuity. The coupling coefficient between the coupled asymmetric SIRs is calculated by using full-wave simulator IE3D. The proposed filter has very good measured characteristics including a low insertion loss of 1.1 dB for both passbands, a high isolation insertion loss of 55 dB between the two passbands and a wide stopband rejection of 38 dB from 2.7 to 5.3 GHz. Good agreement with responses of electromagnetic (EM) simulation and measurement is compared.      

Compact Waveguide-Based Power Divider Feeding Independently Any Number of Coaxial Lines

The device described in this paper has been designed to enable the feeding of many individual plasma sources from a single microwave generator, providing a noninterfering and constant supply of power to each coaxial line driving these plasma sources. The power coming from the generator flows through a waveguide under standing-wave conditions provided by the presence of a conducting plane located at the waveguide end opposite that linked to the generator. Power is extracted from the waveguide, at the maximum of intensity of the E-field standing wave, by a waveguide-to-coaxial-line transition designated as a probe. One or two probes can be set at each such maximum of field intensity (and this on both sides of the waveguide wide wall), yielding a compact power divider. Each coaxial line feeds a microwave field applicator, sustaining plasma, through a matching circuit comprising a tuning means and a ferrite isolator (circulator with a matched load), the latter ensuring that whatever happens to the plasma source, the other feeding lines are not affected. The conditions required for a perfect match of the microwave generator to the power divider are elaborated and examples of actual designs are presented     

Dual-Band Wilkinson Divider With Coupled Output Port Extensions

A new Wilkinson power divider structure is proposed for the dual-band operation. The proposed divider has two output ports extended and coupled through a coupled line section. The use of coupled output port extensions eliminates the need of the input port extension for the dual-band operation and simplifies the overall divider structure. It also provides the improved frequency performance over a wide range of band ratios with practical design parameters and has some potential for the broadband operation for small band ratios.     

Design of Novel Compact Coupled Microstrip Power Divider With Harmonic Suppression

A new microstrip power divider (PD) is proposed which consists of a pair of parallel coupled-lines (PCLs) on a defected ground, and its two outputs are connected by a resistor and a capacitor. The even/odd-mode analysis shows that the defected ground structure (DGS) etched on the ground plane of PCL is equivalent to a strong parallel resonance circuit in the case of even-mode, and a weak inductance in the case of odd-mode. So, this kind of additional reactance effect is used intentionally to design compact coupled microstrip PD with harmonic suppression. Also, the phase-delay through the PD is discussed, which is different from conventional one. A 0.9 GHz PD is developed and experimental results verify it has low insertion loss, good impedance matching and isolation. Furthermore, the third harmonic suppression of this PD is better than ${-}35$ dB and the overall area of divider is only 34% of the conventional case.      

A Compact Two-dimensional Power Divider for a Dielectric Rod Antenna Array Based on Multimode Interference

In this work, multimode interference is investigated for the design of a two-dimensional fully dielectric power divider, well suited for the usage of dielectric waveguides. Most important, power division is achieved in a single device without the need of cascading multiple dividers. This allows to design a very compact and lightweight power divider, well applicable for dielectric rod antenna arrays. As a proof of concept for the used technique, a 16-way power divider with 4 × 4 output ports, made out of Rexolite, is realized, working in a frequency range between 90 and 105 GHz. For the S-parameter measurements, a special measurement setup, including a modular pin probe technique as well as radiation taper for waveguide termination, is proposed. The measurements are in good agreement with the simulations with a power split of ??15 dB for all output ports within the desired frequency range. This is equal to an additional insertion loss of 3 dB. To demonstrate the usability for antenna arrays, a fully dielectric rod antenna array is realized based on the proposed power divider. With this array, a gain of 22.5 dBi at 97.5 GHz was achieved.