Int
ern
at
i
onal
Journ
al of Ele
ctrical
an
d
C
om
put
er
En
gin
eeri
ng
(IJ
E
C
E)
Vo
l.
8
, No
.
6
,
Decem
ber
201
8
, p
p.
526
0
~
5267
IS
S
N:
20
88
-
8708
,
DOI: 10
.11
591/
ijece
.
v
8
i
6
.
pp
526
0
-
52
67
5260
Journ
al h
om
e
page
:
http:
//
ia
es
core
.c
om/
journa
ls
/i
ndex.
ph
p/IJECE
Enh
anced Bandw
idth
of
B
and
Pass
Filte
r U
sing a D
efected
Mic
ro
s
trip
Structu
re
fo
r Wid
eban
d App
lic
ations
Sa
n
ae Az
iz
i
1
, M
us
taph
a
El
Ha
la
ou
i
2
,
Abd
el
mou
men
K
aab
al
3
, Said
a
A
hyoud
4
,
A
del
Asselma
n
5
1
,2,3,
5
Depa
rtment
of
Ph
y
si
cs,
Optic a
nd
Photon
ic T
e
am,
Facu
lty
of
Scie
n
ce,
Abdelma
le
k
Essaa
di
Univ
ersity
,
Morocc
o
4
Depa
rtment
of P
h
y
sics,
Inform
a
ti
on
Te
chno
log
y
and
S
y
stems
Modeli
ng
Team
,
F
ac
ul
t
y
of
Scie
n
c
e,
Abdelmale
k
Essaa
di
Univer
sit
y
,
Morocc
o
Art
ic
le
In
f
o
ABSTR
A
CT
Art
ic
le
history:
Re
cei
ved
J
a
n
9
, 201
8
Re
vised
Ju
l
2
,
201
8
Accepte
d
J
ul
29
, 2
01
8
In
thi
s
pape
r
,
the
bandwid
th
enha
nc
ement
of
bandpa
ss
fil
t
er
(BPF
)
i
s
proposed
b
y
ut
ilizi
ng
def
e
cted
m
ic
rostrip
struct
ur
e
(DM
S).
Th
e
in
it
ial
m
ic
r
o
strip
BP
F
which
is
design
ed
to
have
the
b
andw
idt
h
1GH
z
wi
th
the
ce
n
te
r
fre
quency
of
3
.
5GH
z
is
depl
o
y
ed
on
FR
4
Epox
y
di
el
e
ct
r
ic
su
bstrat
e
wi
th
over
all
siz
e
and
thi
ckn
ess
of
14
m
m
x
24mm
and
1.
6m
m
,
respe
ct
iv
ely
.
The
proposed
fil
te
r
c
onsists
of
two
p
ara
l
le
l
coupl
ed
l
i
nes
ce
ntr
ed
b
y
ri
ng
-
shape
d,
to
enha
n
ce
the
bandwidt
h
respo
nse,
an
at
t
empt
is
ca
rri
ed
out
b
y
apply
ing
D
MS
on
the
ligne
c
ent
er
with
a
ring
-
shap
ed
of
ini
t
ia
l
filter
.
Here
,
the
proposed
DM
S
i
s
construc
te
d
of
the
arr
owhe
ad
d
um
bbel
l.
Som
e
par
ametr
i
cal
studie
s
to
the
D
MS
such
as
changing
to
ob
ta
in
the
op
ti
m
um
geometr
y
o
f
DM
S
with
the
desire
d
bandwid
t
h
response.
F
rom
the
cha
ra
cteri
za
t
ion
result,
it
show
s
tha
t
th
e
uti
l
izati
on
of
DM
S
on
to
the
m
ic
rostrip
li
gn
e
of
fil
t
er
has
widene
d
3dB
bandwidt
h
response
up
to
1.
8G
Hz
ran
ges
from
2.
55GH
z
to
4.
35GH
z
y
i
el
di
ng
an
enha
nc
ed
wideba
nd
response
for
var
ious
wideba
nd
wire
le
ss
a
pp
lications.
Ke
yw
or
d:
Ba
ndpass
f
il
te
r
Ba
ndwidt
h
e
nhancem
ent
DMS
Ri
ng
-
sh
a
pe
d
W
i
de
band
a
ppl
ic
at
ion
s
Copyright
©
201
8
Instit
ut
e
o
f Ad
vanc
ed
Engi
n
ee
r
ing
and
S
cienc
e
.
Al
l
rights re
serv
ed
.
Corres
pond
in
g
Aut
h
or
:
Sanae
Azizi
,
Dep
a
rtem
ent o
f
P
hysic
s,
O
ptics an
d Ph
otoni
cs Team
,
Abdelm
al
ek
Essaadi
Un
i
ver
sit
y,
Faculty
of S
ci
e
nce,
P.
O.
B
ox
2121, T
et
ouan
,
Morocc
o
.
Em
a
il
:
sanae.aziz
i5@g
m
ai
l.c
om
1.
INTROD
U
CTION
The
de
velo
pme
nt
of
wi
reless
com
m
un
ic
ation
te
chnolo
gy
ha
s
been
rem
arkably
increasin
g
du
ri
ng
the
la
st
decad
e.
Ba
sic
al
ly
the
dev
el
opm
ent
is
addresse
d
to
f
ul
fill
the
dem
and
f
or
hi
gh
sp
e
ed
c
omm
un
ic
a
ti
on
s
[1,2
]
.
N
um
ero
us
i
nv
est
igati
on
e
ffor
ts
ha
ve
al
so
been
co
nd
ucted
t
o
sat
isf
y
the
dem
and
by
up
gr
a
ding
e
xisti
ng
te
chnolo
gies
a
pp
li
ed
in
so
m
e
de
vices
with
t
he
new
ones
.
Howe
ver,
the
im
pr
ov
em
ent
so
m
eti
m
es
arises
so
m
e
ob
sta
cl
es
r
ega
r
ding
the
li
m
it
e
d
capa
bili
ty
of
relat
ed
de
vices
includi
ng
am
plifie
r,
powe
r
c
om
bin
er/split
te
r,
an
d
filt
er [3,
4].
Ba
ndpass
filt
ers
a
re
pr
im
e
com
ponen
ts
in
c
omm
un
ic
at
ion
syst
em
s
as
t
hey
he
lp
to
in
hib
it
interfe
ren
ce
a
nd
pr
ov
i
de
the nee
ded
selec
ti
on
of
the
si
gn
al
b
an
d.
Ba
ndpas
s
filt
ers
that
po
ssess
hi
gh
sel
e
ct
ivit
y
in the pass
ba
nd a
re
need
e
d
t
o s
uit m
od
er
n
c
omm
un
ic
at
ion
app
li
cat
io
ns
. [
5].
Pr
inte
d
m
ic
ro
s
trip
filt
er
is
widely
us
ed
du
e
to
their
num
ero
us
a
dvanta
ge
s
su
ch
as
lo
w
prof
il
e,
lo
w
cost,
easy
fa
bri
cat
ion
,
an
d
s
m
al
l
s
iz
e.
Ma
j
or
op
e
rati
onal
disad
van
ta
ge
of
m
ic
ro
strip
f
il
te
r
is
ver
y
nar
r
ow
fr
e
qu
e
ncy
ba
ndwi
dth
.
I
n
som
e
app
li
cat
ions
na
rro
w
band
widths
ar
e
des
irable
[6
]
-
[
9].
By
con
se
que
nt,
the
needs
of
wi
de
band
ba
ndpass
filt
er
hav
e
be
en
pro
po
se
d
a
nd
in
vestigat
e
d
of
ne
w
te
c
hnol
og
ie
s
to
ov
erco
m
e
these s
hortcom
ing
s
.
Evaluation Warning : The document was created with Spire.PDF for Python.
In
t J
Elec
&
C
om
p
En
g
IS
S
N:
20
88
-
8708
En
hance
d
B
andwidth
o
f B
and p
as
s Fil
te
r
Us
ing
a Defe
ct
ed
Mi
crostrip
Str
ucture
for…
(
Sanae
Azizi
)
5261
Seve
ral
diff
e
re
nt
te
chn
i
qu
e
s
ha
ve
b
ee
n
pr
opos
e
d
an
d
re
por
te
d
in
li
te
rature
to
increase
th
e
band
widt
h
of
m
ic
ro
strip
s
uch
as
De
fecte
d
G
r
ound
Str
uc
ture
[10
]
-
[
13]
,
asy
m
m
et
ric
c
ouple
-
li
ne
filt
er
with
a
nnula
r
rin
g
EBG
str
uctu
re
[14],
Stu
b
-
L
oad
e
d
Re
s
on
at
or
[15],
P
IN
diode
[
16
]
,
uniplana
r
c
om
pact
P
BG
(
UC
-
PBG
)
[17],qua
dru
ple
-
m
od
e stu
b
-
l
oa
ded res
onat
or [18
]
a
nd m
ulti
-
sh
ort
-
st
ub m
ulti
-
m
od
e res
onat
or [19
]
.
Def
ect
e
d
Mi
cr
os
trip
Str
uctu
r
e
(D
MS
)
is
one
of
t
he
m
eth
ods,
w
hich
a
re
use
d
to
im
pro
ve
the
band
width
of
the
m
ic
ro
strip
filt
er
an
d
very
us
ef
ul
in
m
ic
rowav
e
beca
us
e
th
e
dist
urban
ce
occ
urs
at
the
m
ic
ro
strip
li
ne
.
DMS
is
reali
zed
by
inserte
d
a
si
m
ple
sh
ape
in
the
m
ic
ro
strip
li
gne.
T
he
i
m
ple
m
entat
ion
of
DMS
in
the
m
i
cro
st
rip
surfac
e
can
increase the
band
width
o
f
the o
rigi
nal
m
ic
ro
strip
filt
er.
Als
o
DMS
is
m
or
e
easi
ly
integrated
with
ot
her
m
ic
ro
wa
ve
ci
r
cuits
and
has
an
eff
ect
i
vely
reduce
d
ci
rcu
it
siz
e,
com
par
ed
with
DGS.
Finall
y
the
DMS
do
e
s
no
t
c
ha
ng
e
the
geo
m
et
ry
of
t
he
gro
und
pla
ne
an
d
helps
to
a
vo
i
d
le
aka
ge
of
ra
dio
fr
e
qu
e
ncy si
gnal
s [
20
]
-
[
21]
.
The
m
a
in
ob
j
e
ct
ive
of
this
w
ork
is
to
enh
a
nc
e
the
per
f
or
m
ance
of
a
ba
nd
pass
filt
er
in
te
rm
s
of
bette
r
return
l
os
s
a
nd
increase
d
bandw
i
dth
t
he
ba
ndpa
ss
filt
er
r
es
on
at
in
g
at
3.5
GH
z
by
em
plo
yi
ng
DM
S
el
em
ent
in
m
ic
ro
strip
filt
er.
T
he
pro
pose
d
DMS
is
placed
on
the
li
gne
center
of
init
ia
l
filt
er
w
hich
is
dep
l
oyed
on
FR4
Ep
ox
y
diele
ct
r
ic
substrat
e
is
desi
gn
e
d
to
ha
ve
w
orkin
g
ba
ndwidt
h
wide
r
tha
n
1GH
z
a
s
the
im
pr
ov
e
m
ent
eff
ect
from
the original
ba
ndwidth res
ponse
.
The
arti
cl
e
is
orga
nized
as
f
ollows.
Sect
io
n
2
prese
nts
a
br
ie
f
desc
ripti
on
of
the
init
ia
l
ban
d
pass
filt
er.
Sect
io
n
3
is
devote
d
to
the
DMS
c
on
c
ept
that
is
i
ntrodu
ce
d
i
n
the
in
it
ia
l
filt
er
and
we
will
see
it
s
eff
e
c
t
on
t
he
s
-
par
am
et
ers.
Com
par
ison
of
the
res
ul
ts
between
the
band
pass
filt
er
with
ou
t
DMS
an
d
with
D
MS
ar
e
sh
ow
n
in
secti
on 4. Fi
nally
, se
ct
ion
5
is
de
vote
d
t
o
c
on
cl
usi
on
.
2.
MICRO
STRI
P
BA
ND PA
S
S FILTE
R
The
pr
opos
e
d
f
il
te
r
is
giv
en
in
Figure
1
(a)
. I
t
is
a
ban
d
pass
filt
er
base
d
on the
struct
ur
e o
f
a
par
al
le
l
coupled
m
ic
ro
strip
li
ne.
Am
ong
the
ad
va
nt
age
s
of
this
el
e
m
ent
include
com
pact
siz
e,
si
m
ple
structure,
and
wide
sto
pb
a
nd.
The
pro
po
se
d
desig
n
co
ns
ist
s
of
two
par
al
le
l
cou
ple
d
li
nes
with
a
ring
-
sha
ped.
The
de
sign
e
d
filt
er
has
tw
o
identic
al
pa
rall
el
li
nes
wit
h
a
n
el
ect
rical
le
ngth
of
a
bout
a
quarte
r
wa
vel
eng
t
h
at
t
he
de
sire
d
center
fr
e
quen
cy
.
The
t
hir
d
l
ine
is
cent
red
betwee
n
the
two
extrem
e
li
nes
with
dif
fer
e
nt
le
ngths
a
nd
widths.
The
wi
dth
of
the
m
idd
le
li
ne
is
W3
,
a
nd
W
2
is
the
widt
h
of
the
tw
o
othe
r
extrem
e
li
ne
s.
The
le
ngths
of
t
he
m
idd
le
li
ne
at
t
he
le
ft
-
an
d
ri
gh
t
-
ha
nd
sid
es
are
L3
an
d
L
2,
res
pecti
vely
.
T
he
a
bove
el
e
m
ents
are
s
pa
ced
by
gap s
pacin
g
S
.
As
il
lustrate
d
in
Fig
ur
e
1,
th
e
geo
m
et
ry
an
d
co
nfi
gurati
on
of
the
pro
po
sed
filt
er
is
de
sign
e
d
a
nd
op
ti
m
iz
ed
us
ing
CST
Mi
crowav
e
St
ud
i
o
s
of
t
war
e
sim
u
lator
on
FR4
s
ubstrat
e
of
diele
ct
ric
con
sta
nt
=
4.4
,
su
bst
rates
thic
kn
e
ss
h
=
1.6m
m
,
copper
thic
kn
e
ss
t=
35μm
,
and
ta
nge
nt
loss
ta
n
δ
=
0.0
25,
the
c
har
act
erist
ic
i
m
ped
ance
of t
he
m
ic
ro
strip li
ne was ta
ken a
s 50Ω.
(a)
(b)
Figure
1. (a
) G
eom
et
ry o
f
the
pro
po
se
d ba
ndpass fil
te
r
(
b)
P
ho
t
ogra
ph of t
he fab
ricat
ed b
andpass
f
il
te
r
The
desi
gned
ba
ndpass
filt
er
structu
re
is
m
an
uf
act
ur
e
d
an
d
te
ste
d
in
the
la
borat
or
y,
a
nd
th
e
pr
act
ic
al
resu
lt
s
a
re
we
ll
com
patible
with
th
os
e
si
m
ula
te
d.
T
he
m
easur
em
ents
of
the
dif
fu
si
on
pa
ram
et
ers
of
the
Evaluation Warning : The document was created with Spire.PDF for Python.
IS
S
N
:
2088
-
8708
In
t J
Elec
&
C
om
p
En
g,
V
ol.
8
, N
o.
6
,
Dece
m
ber
201
8
:
5260
-
52
67
5262
pro
po
se
d
filt
er w
ere
m
ade
by a
Ro
hd
e
an
d
S
chw
a
rz
Z
V
B v
ect
or
n
et
w
ork
analy
zer 2
0, w
ho
s
e
f
re
qu
e
ncy
ra
ng
e
is
lim
it
ed
to
20
GH
z.
A
phot
ogra
ph
of
the
m
anufactu
red
filt
er
is
sh
own
in
Figure
1
(
b).
The
oute
r
dim
ensi
on
of
t
he
prot
otyp
e
was
14
m
m
×
25
m
m
.
The
relat
ed
dim
ension
s
of
t
he
BP
F
as
in
dicat
ed
in
Fig
ur
e
1
.
T
hey
are
in
m
m
Ls
=
14
,
L
0
=
5,
L
1
=
1,
L
2
=
13.2,
L
3
=
19,
L
4
=
2
.
45,
WS=
24,
W0
=
3,
W
1
=
1.9,
W
2
=
0
.
4,
W
3
=
1.
9,
S
=
0
.
4
and R=0
.44.
Figure
2
s
how
s
the
res
ults
of
the
va
riat
ion
of
the
S
-
pa
ra
m
et
ers
as
a
functi
on
of
t
he
f
reque
ncies
si
m
ulate
d
an
d
m
easur
ed
as
well
as
th
os
e
of
t
he
gro
up
de
la
y
of
t
he
propose
d
filt
er.
Ther
e
is
a
rea
so
na
bl
e
agr
eem
ent
bet
ween
the
res
ults
of
the
sim
ulati
on
an
d
t
hose
m
easur
ed,
al
tho
ug
h
the
re
sh
ift
i
n
the
r
eso
nate
fr
e
qu
e
ncy
j
ust
ifie
d
by
m
anu
f
act
ur
in
g
e
rrors
.
The
res
onanc
e
fr
e
quency
is
centere
d
at
3.5
G
Hz,
with
a
r
et
urn
loss,
S
11,
bette
r
tha
n
-
20
dB
an
d
inse
rtio
n
loss,
S
21,
a
r
ound
-
0.1
dB
ha
ve
been
obta
in
ed
par
ti
cularly
in
the
pass
band
from
3.1
to
4.1
G
H
z
and
t
he
3
-
dB
fr
act
io
nal
ba
ndwi
dth
of
t
he
filt
er
is
fou
nd
to
be
27.77
%
.
The
gro
up
delay
va
ries
f
ro
m
0.3
0
to
0.4
5
ns.
In
ot
her
w
ords,
the
m
axi
m
u
m
var
ia
ti
on
in
gr
oup
delay
ac
hieve
s
0.4
5
ns
, i
ndic
at
ing
a
good linea
rity
p
ha
se li
near
it
y
and b
et
te
r
p
e
rfor
m
ance in
ti
m
e dom
ai
n.
(a)
(b)
Figure
2. Com
par
is
on of sim
ulate
d
a
nd e
xperim
ental
r
esults for t
he ban
dpass
filt
er (
a
)
s
i
m
ulate
d
S
-
par
am
et
er,
(
b)
Group Del
ay
3.
BAN
D
P
ASS
FILT
ER WIT
H DMS
To
im
pr
ove
t
he
band
widt
h
of
the
propo
sed
filt
er
we
introd
ucin
g
de
fected
m
ic
ro
strip
st
ru
ct
ur
e
(D
MS
).
Fig
ur
e
3
il
lustrate
s
th
e u
ti
li
zat
ion
of
the ar
row
head
-
slot o
f DMS
over t
he
m
ic
ro
strip li
gne.it
s
how
tha
t
the pr
opos
e
d D
MS is place
d o
n
the
li
gn
e
ce
nter wit
h
a
rin
g
-
s
hap
e
d o
f
init
ia
l fil
te
r.
Figure.
3. Ge
om
et
ry o
f
the
ba
nd p
a
ss f
il
te
r w
it
h
DMS
3.1.
Par
amet
ri
c
Study
The
pe
rfor
m
ance
of
the
filt
er
is
aff
ect
ed
by
these
ge
om
e
tric
par
am
et
ers.
To
optim
iz
e
the
filt
er
and
t
o
hav
e
m
or
e
inf
or
m
at
ion
on
th
e
eff
ect
s
of
th
e
design
par
a
m
et
ers
a
par
am
et
ric
stud
y
of
the
DMS
str
uctu
re
is
carried o
ut.
Si
m
ula
te
d
S
-
par
a
m
et
er p
erfor
m
ance w
it
h varia
ti
on
in param
eter
(
a) is
dep
ic
t
ed
in Fi
gure 4.
Be
tt
er
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En
hance
d
B
andwidth
o
f B
and p
as
s Fil
te
r
Us
ing
a Defe
ct
ed
Mi
crostrip
Str
ucture
for…
(
Sanae
Azizi
)
5263
return
-
loss
a
nd
insertio
n
loss
char
act
e
risti
cs
hav
e
bee
n
observ
e
d
for
a
=
13.
2
m
m
.
Fo
r
higher
value
of
(a
)
,
insertio
n
-
l
os
s
i
n
the
pass
ba
nd
is
increase
d.
Also
,
dec
rease
in
-
10
dB
return
-
l
os
s
band
width
is
obser
ved
f
or
lowe
r
value
of
a.
In
the
stopba
nd,
sli
ght
va
riat
ion
in
in
serti
on
-
l
oss
is
f
ound
w
it
h
good
retu
rn
-
los
s
perform
ance.
(a)
(b)
Figure
4. The
e
ff
ect
of a (
le
ng
th of t
he
ar
r
owhead
-
slot
) on t
he pr
opos
e
d fil
te
r
res
pons
e
. (a
)
E
ff
ect
on r
et
urn
loss|S1
1|. (b
)
E
ff
ect
on inse
rtion l
os
s|S
21|
The
ef
fect
of
va
riat
ion
of
pa
r
a
m
et
er
(b
)
on
S
-
pa
ram
et
er
char
act
erist
ic
s
is
plo
tt
ed
in
Fi
gure.
5.
From
Figure
5,
it
is
seen
that
ins
erti
on
-
loss
a
nd
return
-
loss
pe
rfor
m
ance
are
bette
r
f
or
(b)
=
1.1
m
m
.
W
he
n
(
b)
increases
from
0.5m
m
to
1.1m
m
,
the
retu
rn
lo
sse
s
bec
om
e
m
or
e
m
a
tc
hed
a
nd
ce
nt
red
at
the
de
sired
fr
e
qu
e
ncy
of
3.5GHz,
from
the
gr
a
phs,
we
can
cl
earl
y
see
that
the
insertio
n
-
lo
ss
increases
when
(
b)
is
increase
d.
(a)
(b)
Figure
5. The
e
ff
ect
of b (len
gt
h
of t
he
ar
r
owhead
-
slot
) on t
he pr
opos
e
d
filt
er r
es
pons
e
. (a
)
E
ff
ect
on r
et
urn
loss|S1
1|. (b
)
E
ff
ect
on inse
rtion l
os
s|S
21|
The
relat
ed
di
m
ension
s
of
t
he
final
BPF
wi
th
DMS
as
s
hown
i
n
F
ig
ur
e
3
are
determ
ined
as
f
ollows
(all
in
m
m
),
Ls
=
14,
L
0
=
5,
L
1
=
1,
L
2
=
13.
2,
L
3
=
19,
L
4
=
2
.
45,
WS=
24,
W0
=
3,
W
1
=
0.
9,
W
2
=
0
.
4,
W
3
=
1.9
,
S
=
0
.
4
a
nd R=
0.4
4,
a=
13.2,b=
1.1.
(
With a
size
of
14 ×
24 m
m
2
).
Nex
t
we
pres
ent
ou
r
filt
er
ba
nd
pass
with
DMS
fa
br
ic
at
io
n
a
nd
com
par
e
si
m
ula
ti
on
with
m
easur
em
ent r
esults.
3.2.
Measurem
en
t Results
and
D
isc
ussion
Arrow
head
-
slo
t
DMS
pr
ese
nts
a
gr
eat
er
slow
wa
ve
ef
fect,
since
it
has
m
or
e
discon
ti
nuit
ie
s
,
pro
vid
in
g
a
lo
ng
e
r
tra
j
ect
ory
to
the
el
ect
rom
agn
et
ic
wave.
To
validat
e
the
perform
a
nce,
a
pr
oto
ty
pe
of
pro
po
se
d
BPF
with
DMS
is
fabrica
te
d
ba
sed
on
opti
m
i
zed
dim
ensional
par
am
et
ers
and
m
easur
e
d.
The
Evaluation Warning : The document was created with Spire.PDF for Python.
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:
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8708
In
t J
Elec
&
C
om
p
En
g,
V
ol.
8
, N
o.
6
,
Dece
m
ber
201
8
:
5260
-
52
67
5264
photog
raph
of
top
fabrica
te
d
prototype
is
r
epr
ese
nted
i
n
Figure
6.
T
o
validat
e
the
si
m
ula
ti
on
res
ul
ts
the
perform
ance param
et
ers
of
B
PF wit
h DMS
are m
easur
ed
a
nd co
m
par
e
d wit
h
sim
ulate
d
res
ults.
Figure
6. P
ho
t
ogra
ph of the
fa
br
ic
at
ed
w
i
de
band
pass
filt
er
with
DMS
The
c
om
par
ison
betwe
en
si
m
ula
te
d
an
d
m
easur
ed
retu
rn
-
loss
a
nd
in
serti
on
-
los
s
pe
rfor
m
ance
is
plo
tt
ed
in
Fig
ure
7
(a),
an
d
they
are
fou
nd
to
be
in
good
agr
eem
ent
with
each
ot
her.
I
t
can
be
seen
that
the
m
easur
ed
inse
r
ti
on
-
l
os
s,
|S2
1|
is
bette
r
tha
n
0.6
dB
within
the
entire
-
10
dB
ret
urn
l
os
s
pass
band
from
2.
55
GH
z
to
4.3
5
G
Hz
irres
pecti
ve
of
sim
ulate
d
|
S21|
wh
ic
h
is
bette
r
tha
n
0.4
dB
w
her
eas
return
-
l
os
s
is
m
or
e
tha
n
20 d
B
.
The
m
easur
ed
return
-
loss
in
uppe
r
-
st
opba
nd
is
alm
os
t
fla
t
a
nd
agr
ees
w
it
h
si
m
ulate
d
respon
se
a
nd
perform
ance
bette
r
than
0.4
dB
exten
de
d
up
from
4.
8
to
8
G
Hz.
Als
o
the
m
easur
ed
and
sim
ulate
d
i
ns
erti
on
-
loss
in
this
fr
e
qu
e
ncy
ba
nd
of
interest
is
fo
und
to
be
bette
r
than
15
dB.
S
o
the
pr
op
os
e
d
pass
ba
nd
filt
er
with
D
MS
has wel
l
ou
t
of
band rej
ect
ion
perform
ance
with
ver
y
wide u
pp
e
r
-
st
opba
nd ch
a
ract
erist
ic
.
The
gro
up
delay
perform
ance
f
or
pro
pose
d
band
pass
filt
er
with
DM
S
is
pl
otted
i
n
Figure
7(b
)
sh
owin
g
a
good
a
gr
eem
ent
be
tween
sim
ulated
a
nd
m
easur
ed
resu
lt
.
It
is
o
bse
r
ved
that
t
he
gro
up
delay
va
ries
betwee
n
0.2
to
0.3
5
ns
with
in
the
desire
d
U
W
B
f
reque
nc
y
ban
d.
The
li
ttle
discrep
an
cy
in
si
m
ula
ted
an
d
m
easur
ed
r
es
ul
ts m
a
y be due t
o fab
ricat
ion t
ol
eran
ces a
nd i
m
pr
op
er
s
old
er
ing
of SM
A
c
onnect
or.
(a)
Evaluation Warning : The document was created with Spire.PDF for Python.
In
t J
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&
C
om
p
En
g
IS
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N:
20
88
-
8708
En
hance
d
B
andwidth
o
f B
and p
as
s Fil
te
r
Us
ing
a Defe
ct
ed
Mi
crostrip
Str
ucture
for…
(
Sanae
Azizi
)
5265
(b)
Figure
7.
Com
par
is
on of sim
ulate
d
a
nd e
xperim
ental
r
esults for t
he ban
dpass
filt
er w
it
h DMS
(a) si
m
ulate
d
-
param
et
er,
(b
)
Grou
p Dela
y
4.
COMP
AR
I
S
ON
CON
VEN
TION
AL
BA
ND PA
SS FIL
TE
R
A
N
D
BA
ND PA
SS FIL
TE
R
WITH
DMS
To
s
how
the
ba
ndwidt
h
en
ha
ncem
ent
of
ini
ti
al
UW
B
m
icr
os
t
rip
BPF
,
the
sim
ulati
on
Tech
no
l
og
y
Mi
cro
wa
ve
Stud
i
o
(CST
M
WS)
is
us
e
d
to
cha
racteri
ze
t
he
e
ff
ect
of
D
MS
inc
orporat
ion
i
nto
the
m
i
cro
st
ri
p
li
gn
e.
Fi
gure
8
plo
ts
the
cha
r
act
erizat
ion
re
su
lt
of
pro
po
se
d
U
WB
m
ic
ro
strip
BPF
wit
h
DMS
in
com
par
iso
n
wit
h
the
init
ia
l
filt
er
desig
n
.
I
t
see
m
s
that
the
propose
d
BP
F
has
the
ba
ndwidth
res
pons
e
bette
r
tha
n
ot
her
s
,
wh
il
st
the
init
ia
l
m
ic
ro
strip
BPF
an
d
oth
e
r
ty
pes
of
BP
F
pro
vid
e
res
ults
w
hich
a
re
not
su
it
a
ble
wit
h
the
desire
d
crit
eria
.H
e
nce,
by
inc
orp
or
at
in
g
DM
S
into
the
m
ic
ro
strip
li
gne
,
t
he
pa
ssb
a
nd
ba
ndwidt
h
res
po
ns
e
of
U
W
B
m
ic
ro
strip
BPF
co
uld
be
e
nhance
d
with
t
he
band
width
ac
hieve
m
ent
up
to
1.
8GHz
ra
ng
es
f
ro
m
the
fr
e
qu
e
ncy
of
2.
55G
Hz
to
4.35GH
z
.
Ta
ble
1
s
hows
the
c
om
par
iso
n
t
he
perf
or
m
ance
of
t
he
inti
al
fil
te
r
a
nd
the
filt
er w
it
h DM
S.
Table
1.
Per
for
m
ance Com
pari
so
n o
f
the
Ban
dp
a
ss Filt
er
wi
thout DM
S a
nd Ba
ndpass
Filt
er w
it
h A
rro
w
head
-
slot DMS
Filter
p
ar
a
m
e
ter
BPF with
o
u
t DM
S
BPF with
D
MS
Fc (
G
Hz)
3
.5
3
.45
Retu
rn lo
ss
(
d
B)
0
.1
0
.4
Ins
ertion
los
s (dB
)
>
-
20
>
-
30
Ban
d
pas
s (GHz)
3
.1
-
4
.1
2
.55
-
4
.35
FBW%
2
7
.77
5
2
.17
Figure
8. The
c
om
par
ison bet
ween t
he ba
nd
pass fil
te
r
with
ou
t a
nd
with
D
MS
Evaluation Warning : The document was created with Spire.PDF for Python.
IS
S
N
:
2088
-
8708
In
t J
Elec
&
C
om
p
En
g,
V
ol.
8
, N
o.
6
,
Dece
m
ber
201
8
:
5260
-
52
67
5266
To
furthe
r
de
m
on
strat
e
the
perform
ance
of
the
filt
er,
Ta
ble
2
is
pro
vid
ed
f
or
c
om
par
iso
n
of
this
work
with
oth
e
rs
w
orks
w
hich
are
al
l
base
d
on
wi
de
-
ba
nd
ba
ndpass
filt
er
c
at
egory.
As
il
lustrate
d
in
this
ta
ble
the
po
rop
os
ed
m
e
tho
d
DMS
ha
d
the
best
perform
anc
e
in
te
rm
s
of
ba
ndwith
i
n
c
omparais
on
with
sever
a
l
te
chn
iq
ues
pr
opose
d
in
li
te
rat
ur
e
,
24.4
%
re
ponse
up
f
or
ou
r
te
ch
nique
an
d
9.42%
a
nd
5.6%
f
or
an
nula
r
ri
ng
EBG str
uctu
re
and D
e
fecet
Groun
d
St
ru
ct
ur
e
r
es
pecti
vely
.
Table
2.
C
om
par
iso
n wit
h
S
om
e Repo
rte
d
S
i
m
i
la
r
Ba
ndpas
s Filt
ers
Ref
(GHz
)
FBW
(%
)
,B
W
(M
Hz)
BW
Enh
an
ce
m
en
t
Ty
p
es o
f
Res
o
n
ato
r
W
ith
o
u
t techn
iq
u
e
W
ith
techn
iq
u
e
Ou
r
p
rop
o
sed
3
.5
2
7
.77
%
5
2
.17
%
2
4
.4%
Def
ecet M
i
cros
trip
Str
u
ctu
re
[
1
9
]
1
5
.86
1
8
.9%
36%
1
7
.4%
Multi
-
Sh
o
rt
-
Stu
b
Multi
-
m
o
d
e
reso
n
ato
r
[
1
8
]
2
22%
34%
12%
q
u
ad
rup
le
-
m
o
d
e st
u
b
-
lo
ad
ed
reso
n
ato
r
[
1
6
]
1
.5
29%
50%
21%
PIN
d
io
d
e
[
1
4
]
-
3
9
.39
%
4
8
.81
%
9
.42
%
An
n
u
lar
ring
E
BG
stru
ctu
re
[
1
3
]
2
.4
1
7
1
M
Hz
1
8
0
MHz
5
.6%
Def
ecet G
rou
n
d
St
ructu
re
5.
CONCL
US
I
O
N
The
ba
ndwi
dth
enh
a
ncem
ent
of
m
ic
ro
strip
BPF
has
bee
n
inv
est
igate
d
by
util
iz
ing
arro
wh
ea
d
-
slot
structu
re
DMS
in
li
gne
ce
nter
with
rin
g
-
s
ha
pe
d.
The
pa
ram
et
ric
analy
sis
of
di
ff
e
ren
t
va
riable
of
t
he
str
uc
ture
DMS
was
ca
rri
ed
out
t
o
ob
ta
in
the
opti
m
ized
dim
ension
s.
He
nce,
from
the
c
om
par
i
son
of
c
har
act
eriz
at
ion
resu
lt
s
betwee
n
the
i
niti
al
filt
er
and
t
he
pro
po
se
d
filt
er
with
DMS,
i
t
has
been
de
m
on
strat
ed
th
at
the
util
iz
at
ion
of
D
MS
has
s
ucces
sfu
ll
y
en
ha
nce
d
the
band
widt
h
respo
ns
e
up
t
o
24.4%
from
t
he
init
ia
l.
How
ever,
the
propose
d
f
il
te
r
wi
th
DMS
has
show
n
an
i
m
pr
oved
a
nd
acce
ptable
pe
rfor
m
ance
whic
h
can
be
ap
pl
ie
d
to
var
i
ou
s
WI
MA
X
a
nd w
i
deb
a
nd
wireless a
ppli
cat
ion
s.
ACKN
OWLE
DGE
MENTS
The
a
uthors
w
ou
l
d
li
ke
to
e
xpress
t
heir
dee
pest
grat
it
ud
e
to
Naim
a
A.
To
uh
am
i
fr
om
Ele
ct
ro
nics
In
st
ru
m
entat
ion
an
d
m
ic
ro
w
ave
Lab
or
at
ory
,
Faculty
of
Scie
nces.
Ab
e
dlm
a
le
k
Essaadi
Un
i
ver
sit
y,
for
th
e
m
easur
em
ent an
d t
he
te
c
hn
ic
a
l su
ppor
t
REFERE
NCE
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m
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rowave
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arr
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g
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m
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t
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t
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n
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bl
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at
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te
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h
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r
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e
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ral
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el
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pl
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ine
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h
enha
nc
ement
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ult
ra
-
w
ide
band
m
ic
rost
rip
bandpa
ss
fil
t
er
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def
ec
t
e
d
ground
struct
ure
,
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n
gs
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13th
Int
ernati
onal
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er
enc
e
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Quality
in
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s
earc
h
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QiR)
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i,
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A.
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tr
a
ch,
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p
Rec
t
angul
ar
Mo
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Antennas
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c
te
d
Ground
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UW
B
Applic
at
io
ns,”
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ernati
on
al
Journal
of
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e
ct
ronics
and
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unic
ati
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In
t J
Elec
&
C
om
p
En
g
IS
S
N:
20
88
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8708
En
hance
d
B
andwidth
o
f B
and p
as
s Fil
te
r
Us
ing
a Defe
ct
ed
Mi
crostrip
Str
ucture
for…
(
Sanae
Azizi
)
5267
[12]
Shita
Fitria
Nur
ji
han
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Achm
ad
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“
Eff
e
ct
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DG
S
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o
rpora
ti
on
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Ba
ndwidth
Enha
n
c
ement
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UW
B
Microstri
p
BP
F,
”
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te
rn
ati
onal
Con
fe
re
nce
on
Wire
le
ss
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mat
ic
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2017
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2017
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“
Bandwidt
h
E
nhanc
ement
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ec
t
angul
ar
Mic
rostrip
Pat
ch
An
te
nna
using
Defe
cted
Groun
d
Struct
ur
e,”
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n
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l of E
l
ec
tr
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r
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B
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h
enh
an
ce
m
ent
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m
ic
r
ostrip
as
y
m
m
et
r
ic
coupl
e
-
li
ne
b
an
dpass
fil
te
r
wi
t
h
superior
m
at
c
h
ing
and
lower
insert
ion
loss,”
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le
c
tric
al
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unic
ati
on
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EICT)
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nte
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n
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W
en
quan
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Ji
an
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W
enj
ie
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“
High
Sele
ctivity
Bal
an
ce
d
Band
pass
Filt
er
with
Tuna
bl
e
Bandw
idt
h
Us
ing
Stub
-
Loa
ded
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”
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nte
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