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Int. J. Electron. Commun. (AEÜ) 66 (2012) 1021–1025

Contents lists available at SciVerse ScienceDirect

International Journal of Electronics and
Communications (AEÜ)
journal homepage: 

New compact ultra wideband bandpass filter using modified
multi-mode resonator
Hung-Wei Wu ∗ , Yu-Fu Chen
Department of Computer and Communication, Kun Shan University, Taiwan

a r t i c l e

i n f o

Article history:
Received 4 October 2011
Accepted 20 May 2012
Keywords:
UWB
Bandpass filter
Spur-line
Dual notch bands
Stepped impedance structure

a b s t r a c t
A new compact ultra wideband (UWB) bandpass filter (BPF) using modified multi-mode resonator (MMR)
is presented. The filter consists of a multi-mode resonator with dual spur-lines for providing the dual
notch bands at 5.2 and 5.8 GHz and connected with a stepped impedance structure for controlling the
transmission zeros at lower and higher passband edge. The interdigital coupling input/output (I/O) lines
are used for coupling enhancement. The |S21 |-magnitude and the frequencies of notch bands can be well
determined by tuning the dimensions of the dual spur-lines. The designed procedures are discussed and
good agreement between the measurement and EM simulation are compared.
© 2012 Elsevier GmbH. All rights reserved.

1. Introduction
In the front-end of the UWB system, a small circuit size, high
selectivity and wide stopband microwave bandpass filter (BPF) is
essential to provide better frequency response. In the U.S. Federal
Communications Commission (FCC)-defined UWB in-door specification (3.1–10.6 GHz) [1], the 5.2–5.8 GHz wireless local area
network (WLAN) is existed and interfered with UWB system
operations. In order to meet the UWB specifications, the filter characteristics with low loss, high passband selectivity, compact size
and notch bands become more important. Besides, simple design
method and easily implemented structure are also demanded.
Some methods are proposed to introduce the single- or multinotch bands to suppress the interferences [2–4]. In [2], the UWB
filter using the multilayer nonuniform periodical structure is
deployed to improve the selectivity and upper stopband performance. In [3], the UWB filter with a controllable notch band using
the short-circuited-stub-loaded multi-mode resonator (MMR) is
proposed to create an ultra-wide passband, within which a narrow notch band is introduced by an external coupled stepped
impedance resonator (SIR). In [4], the UWB filter with multiple
notch...
Int.
J.
Electron.
Commun.
(AEÜ)
66 (2012) 1021–
1025
Contents
lists
available
at
SciVerse
ScienceDirect
International
Journal
of
Electronics
and
Communications
(AEÜ)
jou
rn
al
h
omepage:
www.elsevier.de/aeue
New
compact
ultra
wideband
bandpass
filter
using
modified
multi-mode
resonator
Hung-Wei
Wu
,
Yu-Fu
Chen
Department
of
Computer
and
Communication,
Kun
Shan
University,
Taiwan
a
r
t
i
c
l
e
i
n
f
o
Article
history:
Received
4
October
2011
Accepted
20
May
2012
Keywords:
UWB
Bandpass
filter
Spur-line
Dual
notch
bands
Stepped
impedance
structure
a
b
s
t
r
a
c
t
A
new
compact
ultra
wideband
(UWB)
bandpass
filter
(BPF)
using
modified
multi-mode
resonator
(MMR)
is
presented.
The
filter
consists
of
a
multi-mode
resonator
with
dual
spur-lines
for
providing
the
dual
notch
bands
at
5.2
and
5.8
GHz
and
connected
with
a
stepped
impedance
structure
for
controlling
the
transmission
zeros
at
lower
and
higher
passband
edge.
The
interdigital
coupling
input/output
(I/O)
lines
are
used
for
coupling
enhancement.
The
|S
21
|-magnitude
and
the
frequencies
of
notch
bands
can
be
well
determined
by
tuning
the
dimensions
of
the
dual
spur-lines.
The
designed
procedures
are
discussed
and
good
agreement
between
the
measurement
and
EM
simulation
are
compared.
© 2012 Elsevier GmbH. All rights reserved.
1.
Introduction
In
the
front-end
of
the
UWB
system,
a
small
circuit
size,
high
selectivity
and
wide
stopband
microwave
bandpass
filter
(BPF)
is
essential
to
provide
better
frequency
response.
In
the
U.S.
Federal
Communications
Commission
(FCC)-defined
UWB
in-door
spec-
ification
(3.1–10.6
GHz)
[1],
the
5.2–5.8
GHz
wireless
local
area
network
(WLAN)
is
existed
and
interfered
with
UWB
system
operations.
In
order
to
meet
the
UWB
specifications,
the
filter
char-
acteristics
with
low
loss,
high
passband
selectivity,
compact
size
and
notch
bands
become
more
important.
Besides,
simple
design
method
and
easily
implemented
structure
are
also
demanded.
Some
methods
are
proposed
to
introduce
the
single-
or
multi-
notch
bands
to
suppress
the
interferences
[2–4].
In
[2],
the
UWB
filter
using
the
multilayer
nonuniform
periodical
structure
is
deployed
to
improve
the
selectivity
and
upper
stopband
perfor-
mance.
In
[3],
the
UWB
filter
with
a
controllable
notch
band
using
the
short-circuited-stub-loaded
multi-mode
resonator
(MMR)
is
proposed
to
create
an
ultra-wide
passband,
within
which
a
nar-
row
notch
band
is
introduced
by
an
external
coupled
stepped
impedance
resonator
(SIR).
In
[4],
the
UWB
filter
with
multiple
notch
bands
by
using
the
asymmetric
coupling
strips
is
proposed.
The
structure
can
provide
two
main
paths
for
the
signals,
which
makes
it
possible
to
generate
multiple
transmission
zeroes.
The
center
frequencies
and
bandwidths
of
the
notched
bands
can
be
Corresponding
author.
E-mail
address:
hwwu@mail.ksu.edu.tw
(H.-W.
Wu).
controlled
by
tuning
the
structural
parameters.
These
works
can
effectively
provide
multiple
notch
bands
in
the
design
of
UWB
fil-
ters.
However,
the
design
methods
and
fabrication
processes
are
hard
to
follow
and
difficult
to
realize.
In
[5],
the
proposed
stepped-
impedance
stub-loaded
resonator
(SISLR)
has
the
advantage
of
providing
more
degrees
of
freedom
to
adjust
the
resonant
frequen-
cies
at
which
the
two
transmission
zeros
can
be
created
at
both
lower
and
upper
sides
of
the
passband.
The
method
can
be
applied
to
develop
a
high
passband
selectivity
UWB
filter.
In
this
paper,
the
compact
UWB
filter
with
dual
notch
bands
using
modified
multi-mode
resonator
is
proposed.
The
dual
notch
bands
characteristics
at
5.2/5.8
GHz
are
determined
by
the
dimen-
sions
of
the
dual
spur-lines.
The
stepped
impedance
structure
is
designed
and
placed
at
the
symmetric
plane
of
the
filter
for
improv-
ing
the
passband
selectivity.
The
purpose
of
this
study
is
to
provide
a
simple
method
to
design
the
compact
UWB
filter
with
high
pass-
band
selectivity
and
dual
notch
bands.
The
theory
and
guideline
for
designing
the
geometric
parameters
of
the
proposed
filter
are
clearly
described.
The
measured
results
of
the
fabricated
filter
are
in
good
agreement
with
the
full-wave
electromagnetic
(EM)
simu-
lation
results
[6].
2.
Circuit
design
Fig.
1(a)
shows
the
structure
of
the
proposed
UWB
filter.
The
fil-
ter
consists
of
a
multi-mode
resonator
(MMR)
with
dual
spur-lines
for
providing
the
dual
notch
bands
at
5.2
and
5.8
GHz
and
connected
with
a
stepped
impedance
structure
for
controlling
the
transmis-
sion
zeros
at
lower
and
higher
passband
edge.
The
lengths
of
the
1434-8411/$
see
front
matter ©
2012 Elsevier GmbH. All rights reserved.
http://dx.doi.org/10.1016/j.aeue.2012.05.007
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