Indonesi
an
Journa
l
of El
ect
ri
cal Engineer
ing
an
d
Comp
ut
er
Scie
nce
Vo
l.
12
,
No.
3
,
Decem
ber
201
8
, p
p.
1020~
1029
IS
S
N: 25
02
-
4752, DO
I: 10
.11
591/ijeecs
.v1
2
.i
3
.pp
1020
-
1029
1020
Journ
al h
om
e
page
:
http:
//
ia
es
core.c
om/j
ourn
als/i
ndex.
ph
p/ij
eecs
Ellip
tical BandP
assThre
e Dimensi
onal Fr
eq
uency
Selectiv
e
Su
rface
with Mu
ltip
le Transmissi
on Zer
os
Bi
mal Raj D
u
tta
1
,
Bi
n
od
Ku
mar
Kana
uj
ia
2
,
Chha
ya
Da
l
el
a
3
1
Depa
rtment of
El
e
ct
roni
cs
&
C
om
m
unic
at
ion,
A.N.A
Coll
ege o
f
Engi
n
ee
ring
&
Mana
gement
Stu
die
s,
Ind
i
a
2
School
of
Com
puta
ti
on
al a
nd
In
te
gra
ti
ve
sci
enc
e
s
,
Jawaha
r
la
l
Ne
hru
Univer
sit
y
,
I
ndia
3
Depa
rtment of
El
e
ct
roni
cs
&
C
om
m
unic
at
ion
,
J
SS
Aca
dem
y
o
f Tec
hn
ic
a
l Educ
a
ti
on,
India
Art
ic
le
In
f
o
ABSTR
A
CT
Art
ic
le
history:
Re
cei
ved
J
un
3
, 201
8
Re
vised
Ju
l
1
5
,
201
8
Acce
pte
d
Aug
2
7
, 201
8
An
el
li
ptic
ban
d
pass
respons
e
thre
e
-
d
imensional
Freque
nc
y
Sele
ctiv
e
Surfac
e
(3D
FS
S)
is
designe
d
f
rom
a
single
un
it
c
el
l
of
2D
a
r
ra
y
of
tw
o
shiel
ded
m
ic
rost
rip
li
nes.
The
d
esigne
d
FS
S
pro
vide
s
pseudo
-
el
l
ipt
ic
band
-
pass
fre
quency
r
espon
se
(5.
4
–
9.
6)
GH
z
with
i
ts
appl
i
ca
t
ion
in
lo
ng
-
dista
nc
e
rad
io
tele
comm
unic
at
ions
an
d
spac
e
com
m
unic
at
ions
etc.
Th
e
four
tra
nsm
ission
ze
ros
at
5.
4GH
z,
9.
6GH
z,
12.
4GH
z
and
15GH
z
provide
s
wid
e
out
-
of
-
band
fre
q
uency
rejec
t
ion.
The
3D
FSS
is
i
ndepe
nden
t
of
the
var
iations
in
the
in
ci
den
t
angl
e
of
th
e
p
l
ane
wav
e
up
to
60
degr
ee.
E
a
ch
unit
c
el
l
is
a
combinat
io
n
of
two
shiel
ded
m
ic
rostrip
lines
with
one
havi
ng
an
a
i
r
gap
and
the
oth
e
r
one
hav
ing
in
bet
wee
n
recta
ng
ula
r
m
et
a
ll
i
c
pl
a
te
.
W
hen
a
TE
pola
r
ized
p
la
ne
wav
e
inci
dent
s
per
pend
icular
to
th
e
per
fec
t
el
e
ct
ri
c
conduc
tor
(PEC
)
boundar
y
wa
lls
shiel
ded
m
ic
ro
strip
li
nes,
it
res
ult
s
in
two
quasi
-
TE
M
m
odes
namel
y
ai
r
a
nd
subs
tra
te
m
o
de.
The
3D
FS
S
consists
of
m
ult
ipl
e
resona
t
ors
with
a
m
ult
imode
ca
vity
ha
ving
num
ber
of
propa
gating
m
odes.
The
se
resona
ti
ng
m
ode
s
in
phase
prov
ide
tra
nsm
ission
pole
s
and
when
out
of
p
hase
giv
e
t
ran
s
m
ission
ze
ros.
The
3D
FS
S
struct
ur
e
is
sim
ula
te
d
using
Ans
y
s
HF
SS
software
with
i
m
prove
d
per
for
m
anc
e
over
2DF
S
S,
for
m
a
n
y
pr
actical
ap
pli
c
at
ions
such
as
an
te
nna
sub
-
ref
lector
,
rad
om
es
and
spa
ti
al fi
lt
ers
.
Ke
yw
or
d
s
:
Ell
ipti
c
Fil
te
rs
Fr
e
qu
e
ncy Sel
ect
ive
Surfa
ce
Ra
dio
wa
ve pr
op
a
gatio
n
R
eson
at
or
s
Transm
issi
on
li
ne
the
or
y
Copyright
©
201
8
Instit
ut
e
o
f Ad
vanc
ed
Engi
n
ee
r
ing
and
S
cienc
e
.
Al
l
rights
reserv
ed
.
Corres
pond
in
g
Aut
h
or
:
Bim
al
Raj
Du
tt
a
,
Dep
a
rtm
ent o
f El
ect
ro
nics
& C
omm
un
ic
at
io
n,
A.N.
A
Coll
e
ge
of E
ng
i
neer
i
ng &Ma
na
gem
e
nt Studie
s,
I
nd
i
a
.
Em
a
il
:
br
aj
du
tt
a@g
m
ai
l.co
m
I.
INTROD
U
CTION
The
el
ect
r
om
a
gn
et
ic
wav
e
s
a
pp
ea
r
li
ke
Fr
e
qu
e
ncy
sel
ect
ive
s
urface
s
pat
ia
l
filt
ers
with
band
pass
or
band
st
op
c
harac
te
risti
cs.
The
y
hav
e
bee
n
t
he
top
ic
of
re
se
arch
f
or
the
previo
us
few
de
cades
a
nd
have
bee
n
us
e
d
in m
any p
ract
ic
al
ap
plica
ti
on
s su
c
h
as s
patia
l fil
te
rs,
r
ado
m
es, p
olari
z
er,
ante
nn
a s
ub
-
re
flect
or
s etc
[1
-
3].
Trad
it
io
nal
tw
o
-
dim
ension
al
per
i
od
ic
2D
F
SS
str
uctu
res
wer
e
desi
gn
e
d
by
the
per
i
od
ic
arr
ay
c
om
bin
at
ion
of
un
it
cel
ls
wh
ic
h
wer
e
c
onstruc
te
d
by
ei
ther
et
ching
t
he
sl
ot
s
fr
om
the
con
duct
in
g
plate
s
or
by
pri
ntin
g
the
cond
ucting
pa
tc
hes
over
t
he
diele
ct
ric
la
yer
[
4
-
5].
T
hes
e
trad
it
ion
al
t
wo
-
dim
ensional
per
io
dic
2D
FS
S
structu
re’s
sin
gle
la
ye
r
suffe
rs
f
ro
m
poor
fi
lt
ering
respo
nse
,
poor
sel
ect
ivit
y,
unsta
ble
angular
r
es
ponse
an
d
narrow
ba
ndwi
dth
.
W
it
h
the
ad
va
nc
e
m
ent
in
the fi
el
d
of
a
nten
na
s
an
d
c
omm
un
ic
at
ion
it
becam
e
desira
ble
to
r
eal
iz
e
thin
FSS
st
ru
ct
ur
es
to
ac
hieve
hi
gh
sel
ect
ivit
y
a
nd
sta
ble
fr
e
qu
ency
res
ponse
unde
r
diff
e
re
nt
an
gles
of
inci
den
ce
.
Re
qu
irem
ent
of
s
uc
h
a
dv
a
nce
d
FS
S
str
uctu
r
es
le
ad
the
r
es
earch
t
ow
a
rds
a
new
cl
ass
of
FSS
str
uctu
res
cal
led
three
-
dim
ension
al
FSS
f
ro
m
the
tra
diti
on
al
2D
FSS
[
6
-
7].
The
3D
FSS
c
on
ce
pt
giv
es
r
eal
iz
at
ion
of
c
om
pac
t
and
high
pe
rfo
rm
ance
FSS
struct
ur
es
.
O
n
casca
ding
num
ber
of
2D
FS
S
la
ye
rs
with
in
betwee
n
die
le
ct
ric
sp
aci
ng
res
ults
to
a
sign
ific
a
nt
i
m
pr
oved
filt
ering
res
pons
e
[8
-
9].
T
he
casca
de
d
2D
F
SS
does
not
obta
in
Evaluation Warning : The document was created with Spire.PDF for Python.
Ind
on
esi
a
n
J
E
le
c Eng &
Co
m
p
Sci
IS
S
N:
25
02
-
4752
Ell
ipti
cal BandPassT
hr
ee
D
i
men
si
onal F
re
qu
e
ncy
Select
iv
e Surface
wi
th M
ulti
ple
…
(
Bimal R
aj
Du
tt
a
)
1021
el
li
ptic
respon
s
e;
it
prov
i
des
t
he
filt
ering
res
pons
e
that
fo
ll
ow
s
Butt
er
w
ort
h
or
C
he
bysh
e
v
functi
on
du
e
to
the
form
ation
of
di
rect
-
co
up
le
d
r
eso
nators
[
10
]
.
Pr
act
ic
al
app
li
cat
ion
s
of
the
FSS
str
uctu
res
dem
and
s
sta
bi
li
ty
in
the
var
ia
ti
ons
of
an
gula
r
res
pons
e
,
wh
e
re
2D
F
SS
struct
ur
es
s
howe
d
unsta
ble
f
reque
ncy
respo
ns
e
f
or
the
var
ia
ti
ons i
n
th
e incide
nce a
ngle
.
The
3D
FSS
struct
ur
es
ha
ve
s
how
n
fa
r
m
or
e
sta
bili
ty
in
the
fr
e
quency
r
e
sp
onse
unde
r
va
riat
ion
s
i
n
the
incide
nce
a
ng
le
.
In
C
om
par
iso
n
to
co
nv
entional
m
ulti
l
ay
er
2D
FSS
s
tructu
res,
3D
F
SS
struc
ture
s
can
be
desig
ne
d
to
obt
ai
n
br
oad out
-
of
-
band fre
quen
cy
r
ejecti
on
w
i
th the m
ulti
ple trans
m
issi
on
z
ero
s
.
(a)
(b)
Figure
1
.
(a
) 3
D
F
SS u
nit cel
l sh
ow
i
ng cr
os
s
-
co
upli
ng and
couplin
g betwe
en
the
tw
o port
s v
ia
m
ulti
ple
resonato
rs
t
o o
btain tra
ns
m
iss
ion
ze
r
os
/p
oles
and
ps
e
udo
-
el
l
ipti
c respo
ns
e
,
(b)
.
Eq
uiv
al
e
nt m
od
el
o
f
an
y
3D
FSS wit
h
m
ultip
le
r
es
onat
ors
Ell
ipti
c
filt
ering
res
ponse
in
3D
FSS
is
ach
ie
ved
with
the
increase
of
th
e
le
vel
of
cr
oss
-
co
upli
ng
betwee
n
the
re
so
na
tor
s
as
show
n
in
Fi
g
ure
1(
a
)
w
hich
we
re
abse
nt
in
ca
scade
d
previ
ous
m
ulti
layer
2D
FSS
desig
ns
.
Ell
i
ptic
filt
ering
res
ponse
in
3D
F
S
S
desi
gn
can
be
achieve
d
with
the
hel
p
of
t
wo
ports
of
th
e
unit
cel
l
coupled
w
it
h
m
or
e
than
on
e
res
onat
or
as
sho
wn
in
F
ig
ure
1
(a)
[
11
-
12]
.
T
he
c
onc
ept
of
3D
F
SS
will
pro
du
ce
m
ultip
le
transm
issio
n
po
le
s/z
er
os
through
m
ult
i
m
o
de
resonat
or
s
.
Re
cent
r
esearch
in
3D
FSS
te
chnolo
gy
ha
ve
bee
n
ar
ound
the
band
-
pass
or
ba
nd
-
re
j
ect
structu
res,
they
are
desig
ned
with
the
unit
cel
l
of
a
sing
le
s
hielded
m
ic
ro
strip
wit
h
a
short
via
hole
betwee
n
m
ic
ro
stri
p
li
ne
and
gro
und
[
12
-
13]
.
The
desi
gn
e
d
un
it
cel
l
of
th
r
ee
-
dim
ension
al
FSS
was
t
he
n
ge
om
et
rically
m
od
ifie
d
to
a
dd
on
a
n
e
xtra
transm
issi
on
zero
i
n
each
m
od
ific
at
ion
.
T
hus
m
ax
i
m
u
m
three
transm
issi
on
zeros
hav
e
bee
n
obta
ined
for
the
band
-
pass
3D
FSS
structu
re
with
ps
e
udo
-
el
li
ptic
response
[
14
-
15
]
.
I
n
this
des
ign
of
3D
F
SS
four
tra
ns
m
iss
ion
zer
os
with
band
-
pass
el
li
ptic re
sp
onse
, a
nd br
oad f
reque
ncy
band re
j
ect
ion
has bee
n
stu
die
d.
Un
li
ke
the
pre
vious
3D
F
SS
structu
res,
the
un
it
cel
l
of
the
3D
F
SS
str
uctur
e
is
desig
ned
an
d
st
ud
ie
d
with
tw
o
sh
ie
l
de
d
m
ic
ro
strip
s
li
nes
placed
par
al
le
l
to
eac
h
oth
e
r.
B
oth
t
he
m
ic
ro
strip
l
ines
are
co
nne
ct
ed
to
their
res
pecti
ve
gr
ou
nd
th
r
ough
sho
rt
via
and
a
recta
ngular
m
et
a
ll
ic
plate
being
pla
ced
one
over
ano
t
her
m
ic
ro
strip
li
ne
.
The
de
sig
ned thr
ee
-
dim
ension
al
FS
S w
it
h
a
2
D
ar
ray
ar
ra
ngem
ent
of
double
s
hield
m
ic
ro
strip
li
nes
place
d
perpe
nd
ic
ular,
to
s
upport
t
wo
quasi
-
TE
M
m
od
es
na
m
el
y
ai
r
and
substrat
e
m
od
es
[16].
Transm
issi
on
zero
s
a
re
intr
oduce
d
at
the
desired
fi
nite
fr
eq
ue
ncies
of
a
pass
-
ba
nd
of
3.3
GH
z
i
n
the
C
fr
e
qu
e
n
cy
ba
nd
(
4
-
8)
G
Hz
and
X
f
re
qu
e
nc
y
band
(
8
-
12
)
G
Hz
with
broa
d
f
reque
nc
y
band
re
j
ect
ion.T
his
i
m
pr
oves the
s
el
ect
ivit
y of
th
e operati
ng
ba
ndwidt
h.
2.
RESEA
R
CH MET
HO
D
An
y
3D
FS
S
st
ru
ct
ur
e
is
re
pr
e
sented
by
a
n
e
qu
i
valent
m
odel
of
Fig
ur
e
1(
b)
w
hich
has
a
n
e
qu
i
val
ent
m
od
el
of
t
otal
ei
gh
t
resonat
ors.
H
ere
f
our
re
so
na
tor
s
R
1
,
R
2
,
R
3
an
d
R
4
reso
na
tor
s
are
us
ed
to
co
nnect
i
nput
port
an
d
outp
ut
port,
res
on
at
ors
R
a
an
d
R
b
are
c
onnected
t
o
the
input
port
only
and
res
onat
ors
R
c
and
R
d
are
connecte
d
to
the
outp
ut
port
only
.
Ever
y
Re
s
on
at
or
def
i
nes
their
pr
op
a
ga
ti
ng
m
od
e.
R
1
,
R
2
,
R
3
and
R
4
res
on
at
or
s
will
pro
vid
e
transm
issi
on
zeros/
pole
s
at
their
res
pe
ct
ive
res
on
a
nt
fr
e
quencies.
The
add
it
io
nal
tran
sm
issi
on
zer
os
will
be
pro
vid
ed
by
res
onat
or
s
R
a
,
R
b
,
R
c
and
R
d
at
the
desire
d
f
requen
ci
e
s
.
These
ad
diti
onal
transm
issi
on
zer
os
i
ncr
ease
s
oper
at
ing
ba
nd
wi
dth
of
a
band
-
sto
p
FSS
,
w
hic
h
im
pr
oves
t
he
sel
ect
ivit
y
of
a
band
-
pas
s
FS
S.
T
he
pro
duc
ti
on
of
the
des
ired
nu
m
ber
of
tran
sm
issi
on
zero
s/
po
le
s
at
finite
fr
e
qu
e
ncies
ca
n
be
res
ulted
by
co
ntr
olli
ng
the
num
ber
of
res
on
at
or
s
and
their
res
on
a
nces
t
hat
m
akes
Evaluation Warning : The document was created with Spire.PDF for Python.
IS
S
N
:
2502
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Ind
on
esi
a
n
J
E
le
c Eng &
Co
m
p
Sci,
Vo
l.
12
, N
o.
3
,
Dece
m
ber
2
01
8
:
1020
–
1029
1022
transm
issi
on
z
ero
s
3D
FSS
structu
res
m
ore
ad
van
ta
geou
s
than
2D
FS
S
str
uctures
[
14
]
.
2D
F
SS
can
be
consi
der
e
d
a
sp
eci
al
case
of
this
equ
i
va
le
nt
m
od
el
of
three
-
dim
ension
al
F
SS
with
one
re
so
na
tor
or
m
od
e
that
resu
lt
s i
n
a si
ngle
tra
ns
m
issi
o
n
ze
ro
/
po
le
w
hi
ch
pr
ov
i
des p
oor fil
te
ring p
e
rfor
m
ance.
Figure
2(
a
). Ba
sic
unit
cell
o
f
a 3D F
SS
Figure
2(b
).
P
r
op
a
gatin
g
m
odes o
f
a
basic
unit
cel
l
of
a
3D
FS
S
The
w
orkin
g
pri
nciple
of
3D
FSS
can
be
re
viewe
d
by
sho
wing
that
how
the
resonato
rs
are
form
ed.
As
s
how
n
i
n
F
ig
ure
2(
a
)
we
hav
e
a
basic
unit
cel
l
that
is
us
e
d
as
a
bu
il
di
ng
bl
ock
f
or
three
-
dim
ensio
nal
FS
S
structu
res.
Her
e
a
plane
wav
e
with
TE
po
la
rizat
io
n
(
el
ect
ric
fiel
d)
or
ie
nted
perpe
nd
ic
ular
to
t
he
sh
ie
lde
d
m
ic
ro
strip
pat
ch
incide
nts
at
the
disco
ntinui
ty
of
ai
r
-
to
-
m
ic
ro
stri
p
li
ne,
two
pro
pag
at
in
g
m
od
es
nam
e
ly
ai
r
and
s
ubstrat
e
m
od
es
are
cre
at
ed.
The
se
m
od
e
s
li
nk
the
input
and
ou
tpu
t
ports
[
6].
Du
e
to
th
e
wav
e
pro
pag
at
io
n
within
tw
o
guide
d
m
edia
(air
and
s
ubstrat
e)
,
m
ic
ro
strip
li
ne
su
pp
or
ts
quasi
-
TEM
wa
ves
i
ns
te
a
d
of
pure
T
EM
wav
e
[
16
]
.
In
qu
a
si
-
TEM
m
od
e
s
the
l
ongitud
i
nal
wa
ves
of
t
he
fiel
d
f
or
the
ai
r
a
nd
substrat
e
m
od
es o
f
a m
icr
os
t
rip
li
ne
exi
st an
d
these
are
m
uch
sm
aller th
an
t
he
tra
nsv
erse
wav
e
s [1
7]
.
E
l
≠
0
,
H
l
≠
0
(1
a
)
|
E
l
|
≪
|
E
t
|
,
|
H
l
|
≪
|
H
t
|
(1b)
The
si
gn
al
s
a
r
e
travell
in
g
th
r
ough
the
ai
r
pa
th
f
ro
m
p1
po
rt
to
the
ot
her
p2
port
at
l
ow
fr
e
qu
e
ncies.
They p
r
ovide l
ow
-
pa
ss r
es
po
ns
e, as th
e f
re
quency o
f
ope
ra
ti
on
incr
ea
ses these sig
nal travel throug
h
tw
o
path
s
(air
a
nd
substr
at
e).
T
he
s
ub
st
rate
path
res
on
at
or
will
al
ways
res
on
at
e
first
than
t
he
ai
r
pat
h
res
onat
or
sin
ce
the
gu
i
ded
wa
vele
ng
t
h
(
λ
g
)
of
the
su
bst
rate
path
is
le
ss
than
the
ai
r
pat
h
(
λ
0
)
[
14,
17]
.
In
Fig
ure
2(b
)
of
ai
r
a
nd
su
bst
rate
pr
opagati
ng
m
od
es
of
the
basic
un
it
cel
l,
the
t
wo
possibil
it
ie
s
are
resu
lt
e
d
(a)
t
he
ge
ne
rati
on
of
transm
issi
on
pole
s
w
hen
the
el
ect
rical
le
ngth
of
a
re
s
onat
or
bec
om
es
eq
ual
to
π
,
(
b)
the
gen
e
rati
on
of
transm
issi
on
zero
s
due
to
th
e
ph
a
se
dif
fer
e
nc
e
of
1800
between
t
he
sig
na
ls
in
the
ai
r
a
nd
subst
rate
pat
h.
T
hus
for
a
3D
FSS
basic
unit
cel
l
structu
re
as
s
how
n
in
Fi
g
ure
3,
w
e
obta
in
two
tra
ns
m
issi
on
pole
s
a
nd
a
sing
le
transm
issi
on
z
ero.
By
intr
oduc
ing
a
s
hort
via
ho
le
betwee
n
the
m
ic
ro
strip
li
ne
an
d
the
groun
d
in
t
he
de
s
ign
e
d
un
it
cel
l
of
F
ig
ur
e
3(a)
an
inc
rem
ent
in
num
ber
of
res
on
at
or
(t
hr
ee
res
ona
tors)
was
obse
rv
e
d
[14].
Furt
her
a
rectan
gu
la
r
m
et
al
li
c
plat
e
a
bove
the
m
ic
ro
strip
li
ne
i
n
ai
r
m
edium
w
as
inducte
d
in
the
pr
e
vious
desig
n
resu
lt
ed
i
n
m
or
e
num
ber
of
resonato
rs
(
f
our
resonato
rs
)
as
sh
ow
n
in
Fig
ure
3(
b)
.
T
his
increm
ent
in
the
nu
m
ber
of
res
onat
ors
re
su
lt
ed
in
the
i
ncr
em
e
nt
of
nu
m
ber
of
tra
ns
m
issi
on
ze
ro
s
.
W
it
h
the
ad
diti
on
of
T
sh
a
pe
m
et
al
l
ic
plate
al
ong
with
sm
al
l
ai
r
gap
ab
ov
e
the
m
ic
ro
strip
li
ne
as
di
scusse
d
in
[14],
m
axi
m
u
m
three
transm
issi
on
z
ero
s
we
re
a
ch
ie
ved
,
on
e
be
low
t
he
pass
-
band
an
d
t
wo
ab
ove
the
pa
ss
-
ba
nd.
T
hus
the
geo
m
et
rical
m
od
i
ficat
ion
s
i
n
the
basic
unit
cel
l
resu
lt
ed
i
n
3D
FSS
str
uctur
e
t
hat
sho
we
d
im
pr
ov
em
ent
in
the
sel
ect
ivit
y, filter
re
spo
ns
e
(p
s
eudo
-
el
li
ptic re
sp
onse
)
a
nd sta
ble ang
ular res
pons
e
.
Evaluation Warning : The document was created with Spire.PDF for Python.
Ind
on
esi
a
n
J
E
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c Eng &
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Sci
IS
S
N:
25
02
-
4752
Ell
ipti
cal BandPassT
hr
ee
D
i
men
si
onal F
re
qu
e
ncy
Select
iv
e Surface
wi
th M
ulti
ple
…
(
Bimal R
aj
Du
tt
a
)
1023
Figure
3(
a
)
.
U
nit cel
l of a
3D FSS st
r
uctu
re
structu
re
with
sh
ort
via hole
Figu
re
3(b
)
.
U
nit cel
l of a
3D FSS st
r
uctu
re
with s
hort
via hole
with
only
shor
t
via
hole
and Rect
a
ngula
r
m
et
al
l
ic
p
la
te
2.1
St
ru
cture
Descripti
on
A
3D
view
of
a
three
dim
ension
al
band
-
pas
s
FSS
is
sho
w
n
in
Fig
ure
4
(
a)
an
d
Fig
ure
4(b).
U
nlike
the
tradit
io
na
l 3D
FSS
str
uctu
res
the unit
cel
l
of
t
he
3D
FSS
desi
gn
e
d
i
n
t
his
pa
pe
r
c
on
si
sts
of
dual
m
icr
os
t
rip
li
ne
placed
pa
r
al
le
l
to
each
oth
er
,
each
place
d
over
thei
r
re
sp
ect
ive
substr
at
e.
The
unit
cel
ls
sh
own
ab
ove
in
Fig
ure
3(a
)
,
(
b)
an
d
discusse
d
in
[14]
ha
ve
be
en
us
e
d
in
the
de
sig
ning
of
the
un
it
cel
l
for
the
ba
nd
-
pa
ss
3D
FSS
str
uctu
re
discusse
d
i
n
th
is
pap
e
r.
T
he
de
sign
e
d
3D
FS
S
struct
ur
e
is
a
2D
pe
rio
dic
arr
ay
com
bin
at
ion
of
du
al
sh
ie
lde
d m
ic
ro
strip li
ne
s p
la
ce
d
in
z
directi
on v
e
rtic
al
ly
.
The
a
rr
ay
of
F
ig
ure
4
is
a
c
om
bin
at
ion
of
4x4
unit
cel
ls.
Her
e
the
unit
c
el
ls
of
Fig
ure
3
a
re
placed
on
e
a
bove
the
oth
er
to
desi
gn
the
un
it
ce
ll
of
Fig
ure
3.
The
unit
cel
l
le
ng
th
in
the
y
directi
on
is
2*h=
7.048m
m
,
wh
ic
h
is
a
c
om
bin
at
ion
of
tw
o
su
bst
rate
re
gions
with
m
ic
ro
stri
p
li
ne
place
d
ov
e
r
them
,
on
e
ai
r
reg
i
on
an
d
t
he
oth
e
r
ai
r
re
gion
with
a
recta
ngula
r
m
et
al
l
ic
plate
.
T
he
le
ngth
of
eac
h
subs
trat
e
in
y
direc
ti
on
is
d=
1.5
24m
m
.
Un
it
cel
l/m
ic
r
os
trip
li
ne
le
ngth
in
z
direct
ion
is
L=
10.
5m
m
.
Un
it
cel
l/su
bst
rate
le
ngth
in
x
dir
ect
io
n
is
b
=
5
m
m
.
The
su
bs
trat
e
m
ater
ia
l
us
ed
in
this
desig
n
is
Rog
ers
RO
3003
with
a
di
el
ect
ric
const
ant
3.
(a)
(b)
Figure
4(
a
)
-
(
b).
3D
view
of t
he
Three
-
dim
ension
al
ba
nd
-
pa
ss FSS str
uctu
r
e
The
m
ic
ro
strip
li
ne
width
in
x
directi
on
is
w
=
3mm
.
Tw
o
s
hortin
g
via
of
diam
et
er
D
=
0.5m
m
are
al
so
incl
ud
e
d
i
n
the
unit
cel
l
to
c
onnect
t
he
c
entre o
f
b
ot
h
t
he
m
ic
ro
strip
li
nes
t
o
thei
r
re
s
pecti
ve
gro
unds.
T
he
un
it
cel
l
rea
pp
ear
afte
r
a
dist
ance
of
“b”
in
x
directi
on
a
nd
“
2*h”
i
n
y
di
recti
on
i
n
this
f
or
m
a
ti
on
of
three
dim
ension
al
F
SS
ar
ray.
The
rectan
gu
la
r
m
e
ta
ll
ic
plate
is
placed
in
a
way
to
def
i
ne
the
distance
betwe
en
the
m
et
al
l
ic
plate
and
the
t
wo
en
ds
of
the
m
ic
ro
strip
li
ne.
Th
ey
are
l3
=
5m
m
and
l4
=
4mm
.
Each
un
it
cel
l
is
hav
i
ng
a
P
EC
bounda
ry
wall
i
n
x
-
z
pla
ne.
The
T
E
po
la
rized
plane
wa
ve
in
z
directi
on
will
be
i
ncid
ent
at
incom
ing
po
rt
1 (air to
m
ic
ro
strip li
ne disc
onti
nu
it
y) as
per
Fig
ure
3(b
).
Evaluation Warning : The document was created with Spire.PDF for Python.
IS
S
N
:
2502
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4752
Ind
on
esi
a
n
J
E
le
c Eng &
Co
m
p
Sci,
Vo
l.
12
, N
o.
3
,
Dece
m
ber
2
01
8
:
1020
–
1029
1024
(a)
(b)
Figure
5. Th
re
e
-
dim
ension
al
view o
f
a
unit
cell
o
f (a)
to
p view
(
b)
,
(
c
)
si
de view
2.2
Eq
uiv
alen
t
ci
rcui
t mo
de
l
The
desig
ne
d
t
hr
ee
dim
ensio
nal
ba
nd
-
pass
FSS
unit
cel
l
equ
i
valent
ci
rc
ui
t
m
od
el
is
sho
wn
in
belo
w
Fig
ure
6.
C
a
&
C
s
repr
esent
e
quivale
nt
ca
pacit
or
s
f
or
the
ai
r
to
m
ic
ro
strip
li
ne
disc
onti
nu
it
y
in
the
ai
r
a
n
d
su
bst
rate
re
gions
of
t
he
desi
gned
un
it
cel
l
re
sp
ect
ively
.
L
s
is
use
d
f
or
the
e
qu
ivale
nt
i
nducto
r
of
s
hort
via.
The
ai
r
re
gion
with
the
re
ct
an
gu
la
r
m
et
allic
plate
betwee
n
t
he
m
ic
ro
strip
pat
ch
a
nd
gro
und
is
div
i
de
d
int
o
tw
o
ref
le
ct
in
g
pat
hs,
they
are
re
presente
d
by
tw
o
s
horted
tra
nsm
issi
on
li
nes
(
Z
a
,
Θ
l3
)
and
(
Z
a
,
Θ
l4
)
.
T
he
ot
her
ai
r
reg
i
on
is
re
pre
sented
by
a
n
open
-
ci
rc
uited
t
ran
sm
issi
on
li
ne
(
Z
a
,
Θ
a
)
.Both
the
sub
strat
e
re
gions
of
the
unit
cel
l
are r
e
presente
d by tw
o path
s
of sam
e ele
ct
ric
al
leng
th
Θ
s
/
2
and s
a
m
e char
act
eri
sti
c i
m
ped
ance
Z
s
.
Figure
6.
Eq
ui
valent circ
uit
m
od
el
o
f
t
he u
nit cel
l for
3D
band
-
pas
s FSS
w
it
h five
r
es
onat
ors a
nd fo
ur
transm
issi
on
z
ero
s
Upper r
eg
io
n
Bo
tt
o
m
regi
o
n
Evaluation Warning : The document was created with Spire.PDF for Python.
Ind
on
esi
a
n
J
E
le
c Eng &
Co
m
p
Sci
IS
S
N:
25
02
-
4752
Ell
ipti
cal BandPassT
hr
ee
D
i
men
si
onal F
re
qu
e
ncy
Select
iv
e Surface
wi
th M
ulti
ple
…
(
Bimal R
aj
Du
tt
a
)
1025
The
c
har
act
e
ris
ti
c
i
m
ped
ance f
or
the
guide
d
reg
i
on
outsi
de
the
unit
cel
l
wi
th
ai
r
is
Z
o
.
T
her
e are
total
five
res
on
at
o
rs
obta
ined
as
c
om
par
ed
to
t
he
m
axi
m
u
m
fo
ur
res
on
at
or
s
obt
ai
ned
i
n
t
he
previo
us
desig
ns
[
14
]
.
These
res
onat
or
s
are
ob
ta
ine
d
when
a
plan
e
wav
e
(TE
pola
rizat
ion)
in
ci
den
ts
on
the
ai
r
to
m
ic
ro
strip
li
ne
disco
ntin
uity
an
d t
he fie
ld
pro
pag
at
es
thro
ugh diff
e
re
nt
re
gi
on
s
of t
he un
it
cel
l.
2.3
Resul
t an
d D
isc
u
ssion
The
S
catte
rin
g
par
am
et
ers
si
m
ula
te
d
res
ults
are
s
how
n
in
Fig
ure
7.
T
hes
e
res
ults
are
use
d
to
a
naly
se
the b
a
nd
-
pass
char
act
e
risti
cs o
f
the
desig
ne
d
3D
F
SS
st
ru
ct
ur
e
.
Figure
7.
S
par
a
m
et
er r
esults
us
ing HF
SS so
ftwar
e
for t
he
t
hree
dim
ension
a
l band
-
pas
s
Figure
7
re
sul
ts
con
sist
s
of
S1
1
(Reflect
ion
Coe
ff
ic
ie
nt
)
and
S
21
(
Transm
issi
on
Coef
fici
ent)
par
am
et
ers
for
the
desig
ne
d
three
dim
ension
al
FSS
str
uct
ur
e
.
The
gr
a
ph
sh
ows
four
t
r
ansm
issi
on
zer
os
a
t
5.4
G
Hz,
9.6
G
Hz,
12.
4GHz
and
15
GH
z
f
re
qu
e
ncies.
The
s
e
transm
issi
on
zer
os
c
on
sist
of
S21
(T
ran
s
m
issi
on
Coef
fici
ent)
at
-
41dB,
-
29.
4d
B,
29
.
8dB
an
d
52dB.
This
f
ourt
h
transm
issio
n
ze
ro
in
the
op
er
at
ing
f
re
quency
band
pro
vid
e
s
wide
out
of
ba
nd
re
j
ect
io
n
[14].
T
he
gr
ap
h
sh
ows
one
tra
ns
m
issi
on
pole
at
f
reque
ncy
8GHz
with
S
11
(Refl
ect
ion
C
oeffici
ent)
of
-
25dB
wh
ic
h
pro
vid
e
s
hi
gh
sel
ect
iv
it
y.
The
Fi
gure
8
sho
ws
in
(a
),
(b),
(c)
a
nd
(d)
pa
r
ts,
the
si
m
ulate
d
f
reque
ncy
r
esp
on
ses
f
or
T
E
po
la
risat
ion
incident
wav
e
at
var
io
us
a
ng
l
es
of
incidenc
e.
It
c
an
be
see
n
that
S1
1
(Reflect
ion
C
oeffici
ent)
and
S
21
(Tr
a
nsm
issi
on
Coef
f
ic
ie
nt)
par
am
eter
s
at
diff
e
re
nt
res
on
ance
fr
e
quenci
es
are
dec
reasi
ng
with
the
in
crease
of
an
gl
e
of
inci
den
c
e
at
200,
400,
a
nd
60
0
resp
ect
ively
.
T
he
Fi
gure
8(d)
sh
ows
t
hat
f
re
qu
e
ncy
re
spo
nse
is
not
ha
ving
a
ny
transm
issi
on
ze
r
o
an
d
po
le
of
desig
ne
d
FSS
.
These
ty
pes
of
3D
FSS
ca
n
be
us
e
d
as
pass
band
s
pat
ia
l
filt
ers
al
lowing
the
desir
ed
ba
nd
sign
al
s
with
re
du
ce
d ra
dar
c
r
os
s secti
on of a
nten
na desig
n wh
ic
h
is
ver
y i
m
po
rtant in ste
al
th tech
no
l
ogy.
A
3D
F
SS
is
de
sign
a
nd
anal
yse
d
with
dual
m
ic
ro
strip
pa
tc
h
with
s
ubstr
at
e
and
rectan
gu
la
r
m
et
a
l
plate
with
via
ho
le
sho
rted
in
side
bo
t
h
the
su
bs
t
rates.
The
wav
el
e
ng
t
h
of
sign
al
s
in
the
s
ub
st
rate
path
is
lower
than
that
in
a
ir
[14,
17
]
.
T
he
structu
re
is
an
al
yse
d
us
in
g
e
qu
i
valent
ci
rc
ui
t
app
r
oac
h
an
d
desi
gn
e
d
in
HF
S
S
so
ft
war
e
.
2.4
Derivin
g t
he S par
ame
te
rs for
th
e
3D
ba
n
d
-
p
as
s
FS
S
The desig
ne
d u
nit cel
l FSS o
f 3D
ba
nd
-
pass
i
n
Fi
gure
5(
a
)
is
obtai
ned b
y
c
om
bin
ing
tw
o u
nit cel
ls i
n
Figure
3(a,
b).
The
desi
gn
e
d
un
it
cel
l
equ
i
va
le
nt
ci
rcu
it
is
sh
ow
n
in
Fig
ure
6.
We
can
obser
ve
f
our
se
ct
ion
s
from
this
equ
i
valent
m
od
el
,
t
wo
ai
r
sect
io
ns
an
d
tw
o
s
ubs
trat
e
sect
ion
s
.
Each
sect
io
n
c
an
be
re
presen
te
d
by
the
trans
fer
m
at
rix
w
hich
w
hen
ca
sca
de
d
would
represe
nt
the
trans
fer
m
at
rix
of
the
entire
unit
cel
l
of
the
desig
ne
d
3D
F
SS
struct
ur
e
.
T
he
Scat
te
rin
g
pa
ram
et
ers
S
11
a
nd
S
21
ar
e
o
btai
ne
d
by
A,
B,
C,
D
para
m
et
ers
of
the
trans
fer
m
at
rix
[
14
]
.
T
he
t
ran
s
fer
m
at
rix
of
t
he
dif
fer
e
nt
sect
ion
s
is
s
how
n
th
r
ough
th
e
bl
ock
dia
gra
m
as
sh
ow
n
in
Fig
ure
9.
Bl
oc
k
1
s
hows
the
tra
nsfer
m
at
rix
fo
r
the
ai
r
sect
ion
with
no
m
e
ta
llic
plate
,
Bl
ock
2
and
Bl
ock
4
s
hows
the
tra
ns
fe
r
m
at
rix
f
or
the
s
ubstrat
e
sect
io
ns
that
are
i
den
t
ic
al
and
Bl
oc
k
3
s
hows
t
he
tr
ans
fe
r
m
at
rix
for
t
he a
ir
sect
ion h
avi
ng m
et
a
ll
ic
p
la
te
.
Evaluation Warning : The document was created with Spire.PDF for Python.
IS
S
N
:
2502
-
4752
Ind
on
esi
a
n
J
E
le
c Eng &
Co
m
p
Sci,
Vo
l.
12
, N
o.
3
,
Dece
m
ber
2
01
8
:
1020
–
1029
1026
(a)
(b)
(c)
(d)
Figure
8.
Sim
ulate
d
S
par
am
et
ers
res
ults f
or
var
i
ou
s
angles
of incide
nce
of
TE
po
la
rized
plane wa
ve.
Th
e
ang
le
s
of inci
de
nce a
re (a)
20
0 (b)40
0 (c)
600 (d)80
0
Fig
ure
9.
Bl
oc
k diag
ram
h
aving the t
ran
s
fer
m
at
rix
of the
four secti
ons
of
the equivale
nt
ci
rcu
it
m
od
el
of the
desig
ne
d un
it
c
el
l
These
par
am
et
ers
A
, B,
C
, D
of
t
he
tra
ns
fe
r m
at
rix
for
the
diff
e
re
nt secti
ons
dep
e
nd
on
C
a
,
C
s
,
L
s
,
Θ
a
,
Θ
s
,
Θ
l3
,
Θ
l4
,
Z
a
,
Z
s
an
d
Z
o
.
F
rom
the
m
at
rix
equ
at
io
ns
1
an
d7
as
gi
ven
in
[
14
]
the
tra
ns
fe
r
m
at
rix
of
eac
h
sect
ion
ca
n
be
ob
ta
ine
d.
The
each
sect
io
n
tr
ansf
e
r
m
at
rix
can
be
ob
ta
i
ned
by
casca
ding
t
he
tran
sfe
r
m
atr
ix
of
each
of it
s sub
-
sect
ion
w
hich
i
s sho
wn th
r
ough a
blo
c
k dia
gra
m
in
Fig
ur
e
10.
[
]
[
]
[
]
[
]
Evaluation Warning : The document was created with Spire.PDF for Python.
Ind
on
esi
a
n
J
E
le
c Eng &
Co
m
p
Sci
IS
S
N:
25
02
-
4752
Ell
ipti
cal BandPassT
hr
ee
D
i
men
si
onal F
re
qu
e
ncy
Select
iv
e Surface
wi
th M
ulti
ple
…
(
Bimal R
aj
Du
tt
a
)
1027
(a)
(b)
(c)
Figure
10.
Bl
oc
k diag
ram
sh
owin
g
the
tra
ns
f
er m
at
rix
of th
e f
our
sect
io
ns
and their
sub
-
s
ect
ion
s
with t
he
equ
i
valent circ
uit m
od
el
o
f
th
e unit
cell
. (
a
) a
ir secti
on w
it
h no m
et
a
ll
i
c p
la
te
, (
b) air
sec
ti
on
with m
et
allic
plate
, (
c
)
t
w
o
i
den
ti
cal
s
ub
st
r
at
e sect
ion
s
Transfe
r
m
a
trix
of
Bl
oc
k
1
and
Bl
oc
k
2
i
n
Fig
ur
e
9
are
casca
ded
to
ge
ther
to
obta
in
the
Tra
ns
fe
r
m
at
rix
of
the
uppe
r
sect
ion
of
the
un
it
cel
l
a
nd
T
ransfe
r
m
at
rix
of
Bl
oc
k
3
an
d
Bl
ock
4
are
casca
de
d
tog
et
he
r
to
obta
in
the
Transfe
r
m
at
ri
x
of
the
bo
tt
om
sect
ion
of
t
he
desi
gned
unit
cel
l
in
Figu
re
10.
T
her
ea
fter
the
trans
fer
m
at
rix
for
t
he
e
ntire
eq
uiv
al
ent
ci
r
cuit
m
od
el
sho
wn
in
Fig
ur
e
6
f
or
the
desi
gned
unit
cel
l
can
be
ob
ta
in
e
d
as
s
how
n
i
n
Fi
gure
11,
w
hich
is
a
casca
de
com
bin
at
io
n
of
th
e
trans
fer
m
atr
ix
of
the
up
pe
r
a
nd
bo
tt
om
r
egi
on
of the e
quivale
nt circ
uit m
od
el
.
Figure
11.
Bl
oc
k diag
ram
h
avin
g
the
tra
ns
f
er m
at
rix
of th
e upp
e
r regi
on
and bott
om
r
eg
ion
of the
equ
i
valent
ci
rcu
it
m
od
el
of the
d
esi
gn
e
d un
it
cell
. T
heir
cascade
co
m
bin
at
ion gi
ves
t
he
equivale
nt tr
ansf
e
r
m
at
rix
The
scat
te
rin
g
par
am
et
ers
(refle
ct
ion
a
nd
t
ran
sm
issi
on
co
eff
ic
ie
nt)
for
the
entire
e
qu
i
valent
ci
rc
uit
m
od
el
are
obta
ined
a
s [1
4]:
S
11
=
A
e
+
B
e
Z
0
⁄
−
C
e
Z
0
−
D
e
A
e
+
B
e
Z
0
⁄
+
C
e
Z
0
+
D
e
(2
a
)
[
]
[
]
[
]
[
]
[
]
Evaluation Warning : The document was created with Spire.PDF for Python.
IS
S
N
:
2502
-
4752
Ind
on
esi
a
n
J
E
le
c Eng &
Co
m
p
Sci,
Vo
l.
12
, N
o.
3
,
Dece
m
ber
2
01
8
:
1020
–
1029
1028
S
21
=
2
A
e
+
B
e
Z
0
⁄
+
C
e
Z
0
+
D
e
(2b)
The
eq
uiv
al
e
nt
ci
rc
uit
pa
ram
et
ers
C
a
,
C
s
a
nd
L
s
ar
e
cal
culat
ed
by
the
physi
cal
dim
ension
s
of
t
he
desig
ne
d un
it
c
el
l s
tructu
re as
fo
ll
ows
[
13, 11]
:
C
a
≈
w
b
h
ω
(
h
−
d
)
Z
0
tan
∆
Θ
(3
a
)
C
s
≈
ε
r
w
b
h
ω
d
Z
0
tan
∆
Θ
(3b)
L
s
=
μ
0
2π
[
d
ln2
d
+
√
(
D
2
)
2
+
d
2
D
+
1
.
5
(
D
2
−
√
(
D
2
)
2
+
d
2
)
]
(3
c
)
The
cha
racteri
sti
c
i
m
ped
ance
o
f
t
he
pa
rall
el
plate
wav
e
gu
ide
Z
0
re
pr
e
sents
the
f
ree
sp
ac
e
re
gion
ou
tsi
de
the
des
ign
e
d
un
it
cel
l
wh
e
n
ca
rr
yi
ng
the
TE
pola
riz
ed
plane
wa
ve.
The
tan
∆
Θ
is
evaluat
ed
from
[1
4]
as foll
ows
;
tan
∆
Θ
=
2h
λ
(
h
−
d
h
ln
h
h
−
d
+
d
h
ln
h
d
)
+
S
1
(
2h
λ
;
0
,
0
)
−
S
1
(
2
(
h
−
d
)
λ
;
0
,
0
)
−
S
1
(
2d
λ
;
0
,
0
)
(3d)
Wh
e
re
S
1
(
x
;
0
,
0
)
=
∑
(
sin
−
1
(
x
n
)
−
(
x
n
)
)
∞
n
=
1
(3
e
)
The
pro
pa
gatio
n
c
onsta
nts
of
the
ai
r
m
od
e
β
a
a
nd
the
s
ubstrat
e
m
od
e
β
s
are
ev
al
uated
from
[
12
]
,
s
o
the ele
ct
rical
leng
t
hs
of air m
od
e a
nd s
ub
st
rate m
od
e are
real
iz
ed
as
fo
ll
ows
Air
m
od
e:
Θ
a
=
β
a
l
(4
a
)
Θ
l3
=
β
a
l
3
(4b)
Θ
l4
=
β
a
l
4
(4
c
)
Substrate
m
ode:
=
(4d)
2.5
Desi
gn
M
eth
od
ol
ogy
The
el
em
entary
design
gu
i
de
li
nes
for
d
es
ign
in
g
the
th
r
ee
dim
ension
al
band
-
pass
F
SS
are
as
per [
1
]
,
[
16
]
,
[
12
]
.
a)
The widt
h
b
a
nd the
h
ei
gh
t
2*
h
of the
unit
cell
sh
ould
b
e
sm
al
le
r
than
the c
enter
fr
e
quenc
y
wav
el
e
ng
t
h
.
b)
The
m
ic
ro
strip
le
ng
t
h
is
cal
c
ul
at
ed
as
L
=
λ
g
2
=
λ
0
2
√
ε
re
(5
a
)
:
G
uid
e
d wav
el
eng
t
h
at
th
e re
qu
i
red cente
r
f
reque
ncy of th
e FSS.
:
Eff
ect
ive
d
ie
le
ct
ric co
ns
ta
nt.
c)
Fo
r
the
m
ic
ro
strip
patch
of t
hickn
e
ss
t
→
0
a
nd
w/d
≥ 1,
is eva
luate
d [10] as
f
ollows
ε
re
=
ε
r
+
1
2
+
ε
r
−
1
2
{
(
1
+
12
d
w
)
−
0
.
5
}
(5b)
Is
a
f
un
ct
io
n of fr
e
quency a
nd
it
s v
al
ue
li
es be
tween
1
<
ε
re
<
ε
r
(5
c)
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Ind
on
esi
a
n
J
E
le
c Eng &
Co
m
p
Sci
IS
S
N:
25
02
-
4752
Ell
ipti
cal BandPassT
hr
ee
D
i
men
si
onal F
re
qu
e
ncy
Select
iv
e Surface
wi
th M
ulti
ple
…
(
Bimal R
aj
Du
tt
a
)
1029
As
t
he
f
re
qu
en
cy
of
opera
t
io
n
in
creas
es
=
.
The
s
hort
via
di
a
m
et
er
D
aff
e
ct
s
the
first
r
es
on
a
nt
f
reque
nc
y,
wh
ic
h
go
es
dow
n
to
l
ow
e
r
value
as
t
he
diam
e
te
r
D dec
reases
due to
the
dep
e
ndency
of the
in
du
ct
a
nce Ls
on dia
m
et
er D.
3.
CONCL
US
I
O
N
A
3D
ba
nd
-
pa
ss
FSS
str
uctu
re
has
been
de
sign
e
d
by
a
2D
per
i
od
ic
a
rr
ay
arra
ngem
ent
of
du
al
su
r
rou
nded
m
ic
ro
st
rip
li
nes
.
Each
m
ic
ro
strip
li
ne
i
n
a
unit
cel
l
is
connec
te
d
to
it
s
resp
e
ct
ive
gro
und
t
hro
ugh
sh
ort
via
hole
.
Tw
o
ai
r
re
gions
a
re
pr
ese
nt
above
t
he
m
ic
ro
strip
li
nes
with
on
e
ha
ving
no
m
et
allic
plate
an
d
the
oth
e
r
ha
vi
ng
a
recta
ngular
m
et
allic
plate
.
Ma
xim
u
m
fo
ur
transm
issi
on
zero
s
a
re
obta
i
ned
as
c
om
pared
to
three
transm
issi
on
zer
os
obta
ined
in
[
14]
.
Thu
s
the
desig
ne
d
three
dim
ension
al
ba
nd
-
pa
ss
FSS
ex
hib
it
s
hig
h
sel
ect
ivit
y,
elli
ptica
l
fr
eq
uency
resp
on
se,
broa
d
fr
e
que
nc
y
ban
d
re
j
ect
i
on
a
nd
sta
ble
fr
eq
ue
ncy
res
ult
fo
r
diff
e
re
nt angle
s of inci
den
ce
.
REFERE
NCE
S
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A.Munk,
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Fre
quency
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lecti
v
e
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eor
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esign”
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,
US
A:
W
il
e
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horba
ni,
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ir
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Zhon
gxia
ng
Shen
“
An
El
l
ipt
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ca
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B
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nc
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Sel
ce
t
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base
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ct
ri
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Loa
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ur
-
Ta
m
ij
an
i,
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m
al
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“
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of
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y
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r
b
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EE
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c
rowave
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S
hen,
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t
y
a,
“
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ide
band
m
ic
rowave
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r
base
d
on
a
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-
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iod
ar
ra
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f
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ic
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ang
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ave
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.
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ec
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ult
ipl
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ansm
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Evaluation Warning : The document was created with Spire.PDF for Python.