IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, VOL. 23, NO. 3, JUNE 2013 1300304
Dual-Band Superconducting Bandpass Filter Using
Embedded Split Ring Resonator
Haiwen Liu, Member, IEEE, Yichao Fan, Zhichong Zhang, Yulong Zhao, Wenyuan Xu,
Xuehui Guan, Member, IEEE, Liang Sun, and Yusheng He, Member, IEEE
Abstract— In this paper, a superconducting YBa
2
Cu
3
O
y
(YBCO) filter employs two sets of octagonal half-wavelength split
ring resonators, which are designed to generate two passbands
with compact size. The center frequency of the lower passband
can be tuned by the outer resonators with loading spirals, and the
center frequency of the upper passband can be adjusted by the
inner resonators with interdigital structure. Both of them provide
sufficient degrees of freedom to control the center frequencies
and fractional bandwidths of the two passbands, independently.
In addition, a pair of side-coupled stubs is applied to control
the bandwidth of the lower passband whereas the interdigital
structure is used to adjust the coupling strength between the
inner split ring resonator (SRR). Based on the above-mentioned
design methodology, a dual-band superconducting elliptic-func-
tion-response bandpass filter operating at 2.45 and 3.5 GHz is
proposed in this paper. Simulated results show that the insertion
losses in both passbands are less than 0.05 dB. Four transmission
zeros are created close to the passband edges, resulting in high
skirt selectivity. For fabrication, high-T
c
superconducting YBCO
films are deposited on double-side-polished 0.5-mm-thick MgO
substrates. The overall size of this filter is 12.1 × 8.4 mm (about
0.25 × 0.17 λ
g
,whereλ
g
is the guided wavelength at the center
frequency of the first passband).
Index Terms—Bandpass filter (BPF), dual-band, split-ring res-
onator (SRR), superconductor.
I. INTRODUCTION
I
N MULTI-BAND wireless communication systems, dual-
band bandpass filter (BPF) becomes one of the most im-
portant circuit components. Many efforts have been reported
for designing dual-band BPF with compact size and good
performance. For example, stepped-impedance resonators(SIR)
have been widely applied for dual-band BPF design. By con-
trolling the impedance ratio and electrical lengths of SIR, it
has a dual-band behavior that can easily control the second
resonant frequency [1]. Dual-band filters can also be realized
by combining two sets of resonators with common input and
Manuscript received October 5, 2012; accepted November 26, 2012. Date of
publication November 29, 2012; date of current version December 26, 2012.
This work was supported by the National Science Foundation of China under
Grant 61061001 and Grant 61161005, and by the 555 Talent Program of the
Jiangxi Province of China.
H. Liu, Y. Fan, Y. Zhao, W. Xu, and X. Guan are with East China of
Jiaotong University, NanChang 330013, China (e-mail: liuhaiwen@gmail.com;
xuehuiguan@yahoo.com.cn).
Z. Zhang is with South China University of Technology, Guangzhou 510006,
China.
L. Sun and Y. He are with the Beijing National Laboratory for Condensed
Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing
100190, China.
Color versions of one or more of the figures in this paper are available online
at http://ieeexplore.ieee.org.
Digital Object Identifier 10.1109/TASC.2012.2230674
Fig. 1. Schematic view of the proposed HTS filter.
output [2], which leads to a relatively large size. In [3], a
resonator is embedded in another one to obtain two passbands.
However, the miniaturization design for this dual-band BPF
circuit remains a challenging problem.
High-temperature superconducting (HTS) microwave device
has lower loss and excellent performances than a normal con-
ducting one. A HTS BPF using SIR with computed insertion
losses better than 0.03 dB is proposed in [4] while a microwave
superconducting reaction-type filter with high-Q performance
is presented in [5]. Instead of the conventional single-band HTS
filters, high-performance dual-band HTS BPF design attracts
more attentions currently.
Based on our previous work about the octagonal resonator
[6], a compact HTS BPF using embedded octagonal resonators
is proposed in this paper. In the proposed filter, the center
frequency of each passband and the coupling between each
resonator can be controlled independently. Small size and high
performance filter for dual-band application is realized. Simu-
lated results are verified by the measured results.
II. F
ILTER DESIGN
A compact dual-band HTS BPF using embedded split ring
resonators (SRRs) and side-coupled stubs is proposed and its
schematic view is depicted in Fig. 1. This BPF includes two
sets of embedded octagonal SRRs, two side coupled stubs, and
an interdigital coupling structure between the two inner res-
onators. The outer resonators of the SRR structure, resonator 1
and resonator 4 with long perimeters, are used to generate the
lower passband at f
1
whereas the inner resonators, embedded
resonator 2 and resonator 3 with short perimeters, are utilized
for producing the upper passband at f
2
. Resonator 1 and
resonator 4 are connected with two 50 Ω I/O lines, respectively.
1051-8223/$31.00 © 2012 IEEE
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