非对称短线加载谐振器：独立调控双频带滤波器

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"该文发表在IET Microwaves, Antennas & Propagation期刊，由Qing-Xin Chu和Zhi-Hui Li共同撰写，他们来自华南理工大学电子与信息工程学院。文章于2012年3月20日提交，2013年2月1日修订，同年4月24日被接受，DOI为10.1049/iet-map.2012.0356，ISSN号为1751-8725。" 本文提出了一种新颖的非对称短线加载谐振器，用于设计一种具有独立可控频率和带宽的双频带带通滤波器（BPF）。在传统的通信系统中，滤波器通常用于筛选特定频率范围内的信号，以消除干扰或提高信号质量。这种新型非对称结构相比于对称短线谐振器，其性能更优，具有更高的设计灵活性。研究的关键创新在于，通过调整谐振器负载短线的长度，可以独立地调节滤波器的前两个谐振频率，而不会互相影响。这意味着设计者可以精确控制滤波器的工作频段，无需担心一个频段的调整会影响到另一个。此外，通过改变耦合参数，可以独立地控制使用非对称短线加载谐振器的双频带滤波器的每个通带的带宽，这在多频段通信系统中尤为重要，因为它允许对不同频段的信号处理进行精细化调整。为了证明这一理论，作者设计、制作并测试了一个基于这种非对称短线加载谐振器的微带双频BPF，其中心频率为2.4 GHz和5.2 GHz。实验结果显示，仿真结果与实际测量结果一致，验证了该设计的有效性和准确性。这种滤波器的应用不仅限于无线通信，还可以在雷达系统、卫星通信和物联网等领域发挥重要作用，提供更加灵活、高效的频率选择方案。这篇研究论文提出了一个革命性的方法，使用非对称短线加载谐振器来实现双频带滤波器的设计，它具有独立可控的频率和带宽特性。这项工作对于微波和射频工程领域的进步有着显著的贡献，为未来的通信系统提供了更多可能性和设计自由度。

Published in IET Microwaves, Antennas & Propagation

Received on 20th March 2012

Revised on 1st February 2013

Accepted on 24th April 2013

doi: 10.1049/iet-map.2012.0356

ISSN 1751-8725

Dual-band filter using asymmetrical stub-loaded

resonator with independently controllable

frequencies and bandwidths

Qing-Xin Chu, Zhi-Hui Li

School of Electronic and Information Engineering, South China University of Technology, Guangzhou,

Guangdong 510640, People’s Republic of China

E-mail: qxchu@scut.edu.cn

Abstract: A new kind of asymmetrical stub-loaded resonator is proposed and applied to design a dual-band bandpass ﬁlter (BPF)

with independently controllable frequencies and bandwidths. The asymmetrical stub-loaded resonator presented in this study has

more superior performance than the conventional symmetrical stub-loaded resonator. By appropriately selecting the lengths of the

loaded stubs of the resonator, the ﬁrst two resonant frequencies can be tuned independently without having inﬂuence on each

other. The bandwidth of each passband of the proposed dual-band ﬁlter using asymmetrical stub-loaded resonators can be

controlled independently by adjusting the coupling parameters. To validate the concept, one microstrip dual-band BPF

centred at 2.4 GHz/5.2 GHz is designed, fabricated and measured. It is found that the simulated and measured results are in

good agreement.

1 Introduction

Recently, the development of multi-service mobile wireless

communication systems has become attractive for

commercial product, especially in the combination of global

position system (GPS), wireless local area network

(WLAN) and global system for mobile communications

(GSM). For example, Samsung Corporation provides the

latest commercial product of I-series cell phones with three

function services, including GPS, WLAN and GSM. Thus

it can be seen that dual- or multi-bandpass ﬁlters (BPFs) are

highly desired. To meet the needs, much research regarding

them has been carried out and various design approaches

have been proposed.

Among them, one straightforward method was that

two BPFs with individual passbands using additional

impedance-matching networks were combined to be a

dual-band ﬁlter in [1]. There were still other ways to

achieve dual-band BPFs. For instance, stepped impedance

resonators (SIRs) had been widely implemented to realise

dual-band BPFs. Theoretical analysis and practical

applications revealed that the fundamental and the second

resonant frequencies of a SIR were easily controlled by the

impedance ratio. The dual-band BPFs using SIRs had

attractive features such as, simple and compact structure in

[2], low insertion loss in [3] and high isolation in [4].

However, both passband frequencies and bandwidths of

these aforementioned ﬁlters were dependent. Stub-loaded

resonators were adopted in dual- or tri-band BPFs design.

The dual- or tri-band ﬁlters were designed by using

centrally symmetrical stub-loaded resonators proposed in

[5, 6]. Theoretical analysis showed that the even-mode

resonant frequencies of centrally symmetrical stub-loaded

resonators could be conveniently tuned without affecting

the odd-mode resonant frequencies in [5]. There were four

kinds of centrally symmetrical stub-loaded resonators,

which were short stub-loaded resonators proposed in [7],

open stub-loaded resonators proposed in [8], crossed

resonators proposed in [9] and active component loaded

resonators proposed in [6], respectively. All of those ﬁlters

designed using symmetrical stub-loaded resonators had a

characteristic of independently controllable frequencies.

However, only Chen et al. [ 7] presented detailed discussion

on adjusting the bandwidth of each passband independently.

Some researchers put forward a new topology of N-band

resonator together with its associated synthesis in [10]. This

kind of topology allowed the independent control of

different transmission zeros and resonances.

In this paper, an asymmetrical stub-loaded resonator

with an open-circuit terminated stub on one side and a

short-circuit terminated stub on the other side is proposed.

Based on our investigation, the passband frequencies of the

dual-band BPF using asymmetrical stub-loaded resonators

are independently adjusted by the lengths of the loaded

stubs. The designed dual-band ﬁlter has two independent

coupling paths. One delivers only the signals of the lower

passband and the other only passes the signals of the upper

passband. By properly controlling the coupling strength at

each path, the desired coupling coefﬁcients of each

passband can be obtained independently. Thus the

bandwidths can be controlled without affecting each other,

when the external quality factors keep ﬁxed. Consequently,

www.ietdl.org

IET Microw. Antennas Propag., 2013, Vol. 7, Iss. 9, pp. 729–734 729

doi: 10.1049/iet-map.2012.0356

The Institution of Engineering and Technology 2013

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