微带四路可重构滤波功率分配器：中心频率与带宽可调

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"这篇研究论文提出了一种新型的微带四路可重构滤波功率分配器，该设备具有可调中心频率（CF）、带宽（BW）和功率分配比（PDR）。通过采用创新的耦合方案，结合四个短路加载的四模谐振器（SL-QMRs）、两个三线耦合结构和两个四分之一波长变换器，能够实现频率、带宽和功率分配的灵活调整，并提供宽隔离带。通过控制SL-QMRs开路端的变容二极管，可以调整双带滤波功率分配器的中心频率和带宽。同时，通过改变三线耦合结构中心线与侧线之间的耦合强度，可以控制功率分配比。相比传统宽带滤波功率分配器，论文中提出的方案在两个输出的并联耦合线上加载电容，以增强耦合，改善回波损耗（RL），从而缓解线路空间的限制。基于耦合谐振器理论，论文详细分析了谐振器和耦合部分的参数设计。" 这篇研究论文的核心知识点包括： 1. **可调中心频率与带宽的滤波功率分配器**：设计的微带四路可重构滤波功率分配器允许通过控制变容二极管来改变其中心频率和带宽，适应不同的信号处理需求。 2. **四模谐振器（SL-QMRs）与新型耦合方案**：论文提出了一种新的耦合策略，利用四个SL-QMRs，两个三线耦合结构和四分之一波长变换器，实现了频率、带宽和功率分配的可调性，同时提供了宽隔离带，增强了系统性能。 3. **功率分配比的控制**：通过调整三线耦合结构中心线与侧线之间的耦合程度，可以精确控制功率分配比，这对于多路功率分配网络的设计至关重要。 4. **回波损耗的优化**：通过在并联耦合线上加载电容，论文提高了回波损耗，这有助于减少信号反射，改善系统整体的信号质量。 5. **理论分析与参数设计**：基于耦合谐振器理论，论文深入分析了谐振器和耦合部分的参数，提供了设计这种复杂可重构滤波功率分配器的理论依据。 6. **实际应用潜力**：这样的可重构滤波功率分配器在无线通信、射频前端、多频段系统等领域具有广泛应用前景，因为它可以灵活适应不同频率和带宽的需求，提高系统灵活性。 7. **技术优势**：与传统方法相比，此设计能更好地平衡带宽、隔离度和功率分配比，同时减小了对线路空间的限制，降低了系统设计的复杂度和成本。这篇论文在微波和射频工程领域提出了一个创新的设计，对于推动可重构滤波功率分配器技术的发展具有重要意义。

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS



Abstract—In this paper, a microstrip reconfigurable four-way

filtering power divider (FPD) with tunable center frequency (CF),

bandwidth (BW), and power division ratio (PDR) is presented. A

novel coupling scheme is proposed based on four stub-loaded

quad-mode resonators (SL-QMRs), two three-line coupled

structures, and two quarter-wavelength transformers, which can

achieve tunable CF, BW, PDR and wide isolation BW. Switchable

single/dual/wide-band filtering response and the CF and BW of

dual-band FPD can be tuned by controlling the varactor diodes

loaded onto the open-ends of SL-QMRs. Meanwhile, the PDR is

controlled by varying the coupling strength between the center

line and sidelines of three-line coupled structure. Compared with

the conventional wideband FPDs, the capacitor loaded onto the

parallel coupled line of two outputs is to enlarge the coupling,

which can improve the return loss (RL) and thus relieve the

limitation of the line space. Based on the coupled-resonator theory,

the parameters of the resonators and coupling sections are

analytically determined. For dual-band FPD, the measured

results show that the 3-dB fractional bandwidth (FBW) of lower

passband can be tuned from 23.4% to 30.9%, while the one of

upper passband is tuned from 12.3% to 18.5%. The measured CF

for upper passband can be tuned independently from 1.98 to 2.21

GHz while the lower one maintains fixed. Then the measured PDR

is controlled from 1:1:1:1 to 1:2:1:2. The proposed four-way

reconfigurable FPD exhibits switchless single/dual/wide-band

filtering responses, high isolation level, wide isolation BW, and the

control of CF, BW, and PDR.

Index Terms—Four-way, filtering power divider (FPD),

single/dual/wide-band filtering response, tunable center

frequency, bandwidth and power divider ratio.

Manuscript received Sep 22, 2017; revised Nov 03, 2017; accepted

Dec 12, 2017. This work was supported in part by the State Key

Laboratory of Millimeter Waves open research program under Grant

K201614, the National Natural Science Foundation of China under

Grant 61401358, the Young Talent Fund of University Association for

Science and Technology in Shaanxi under Grant 20160202, and Natural

Science Basic Research Plan in Shaanxi Province of China under Grant

2017JM6034.

C. Zhu, and W. Wu are with the Ministerial Key Laboratory, JGMT,

Nanjing University of Science and Technology, Nanjing 210094, China

(email: zcmmzr@163.com).

J. Xu is with the School of Electronics and Information, Northwestern

Polytechnical University, 710072, Xi'an, China, and also with the State

Key Laboratory of Millimeter Waves, Southeast University, 210096,

Nanjing, P.R. China.

I. INTRODUCTION

ICRSTRIP four-way power dividers (PDs) with

high-selectivity, high isolation, and reconfigurability are

in great demand in RF/Microwave circuits and modern phased

antenna arrays. Many planar microstrip four-way PDs are

explored on the wide bandwidth [1], compact size [2], equal

ripple [3], dual-band performance [4], and arbitrary power

division [5]. However, the passband selectivity in [1]-[5] is

relatively poor. The passband selectivity of four-way PDs can

be improved by cascading a four-way PD and a bandpass filter

(BPF), which will lead to large circuit sizes. To reduce the

circuit sizes and the mismatching loss, extensive examples of

four-way filtering power dividers (FPDs) with various

advantages are conducted, such as the abilities to achieve single

/ triple-band [6], to obtain narrow BW [7], and to achieve wide

BW [8]-[10]. Nevertheless, the isolation [6] is relatively poor

since no isolation resistor is found in the circuit. In [7], a

four-way FPD is achieved by substituting a BPF for a

conventional quarter-wavelength transformer, leading to the

increased size. In [8]-[10], four-way wideband FPDs are

realized by adding multiple shunt stubs onto a conventional

four-way Wilkinson PD, which can realize multiple

transmission zeros (TZs) out of passband. However, the input

return losses in [8]-[10] are relatively poor. Moreover,

above-mentioned four-way FPDs [6]-[10] are designed at fixed

frequency and power division ratio (PDR), and some four-way

FPDs [7]-[10] are limited to single-band application.

Then several tunable FPDs are reported to realize tunable

single frequency [11]-[13], reconfigurable dual frequency

[14]-[16], and tunable frequency and BW [17]. Nevertheless,

most reported FPDs [11]-[17] are focused on two-way and

fixed PDR applications. Subsequently, a two-way

ultra-wideband PD with tunable PDR is realized in [18].

However, the passband selectivity is relatively poor and the

work is also designed at fixed frequency. Moreover, in those

reported multi-way PDs [1]-[10] and [18], the isolation

bandwidth (BW) for the output ports, especially for two

neighbor output ports (i.e., port 2 and 3, or 4 and 5), is relatively

narrow. So far, a microstrip four-way reconfigurable FPD

having wide isolation BW and simultaneous control of

frequency, BW, and PDR is less explored.

In this paper, a microstrip four-way reconfigurable

single/dual/wide-band FPD with tunable frequency, BW, and

Chuanming Zhu, Jin Xu, and Wen Wu, Senior Member, IEEE

Microstrip Four-Way Reconfigurable

Single/Dual/Wide-Band Filtering Power Divider

With Tunable Frequency, Bandwidth, and PDR

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