uwb Antenna with notched characterstics

1. Compact Planner
Notc
Ali S Abbas
Electrical Engineering Departmen
University of Jordan
Amman 11942, Jordan
a_sameeh@asu.edu.jo
Abstract— A novel and compact planar monopo
(UWB) antenna with dual band-notched c
presented. To achieve an UWB, four circled con
employed into a U-shaped radiation patch cor
modifications in antenna ground plane. The
modified to create two notches for WLAN an
antenna bandwidth covering the range 2.85 to 5
omnidirectional radiation pattern. The
characteristics, total gain, and radiation efficien
are studied using HFSS.
Index Terms— UWB antenna, band-no
antenna.
I. INTRODUCTION
Recently, UWB technology has become
promising technologies for increasing data
communication systems. Such systems have m
including low transmitted power, short rang
transceiver. Federal Communications Com
allocated the bandwidth (BW) 3.1 to 10.6 G
commercial application of UWB systems [1].
the interference of UWB spectrum and ot
technologies like WLAN (5.15-5.825) GHz an
3.7) GHz, UWB antennas with band-notched c
needed. Consequently, many structural con
been designed and implemented to increase
BW. This is including the use of feeding struc
shaped strip and tapered impedance transforme
modified ground plane with Mickey Mouse
patch for SWB applications [3]. Furthermo
antennas with band-notched features has bee
investigated and reported with different geome
a rectangular coupling strip [4], [5] and by us
shaped parasitic structures [6]. In this pape
compact monopole antenna with increased ban
GHz with dual band-notched characteristics i
antenna geometry and design guidelines are fi
Sec. II. Simulated results including return los
pattern, gain, and radiation efficiency are disc
The paper is concluded in Sec. VI.
II. ANTENNA CONFIGURATIO
The proposed ultra-wideband monopol
dimensions are depicted in Fig.1. The antenn
mm thick FR4 epoxy with a permittivity con
r UWB Antenna with Du
ched Characteristics
nt
Mohamed K Abd
Communication Engineerin
German Jordan Uni
Amman, Jorda
Mohamed.Abdelazeez@
ole ultra wideband
characteristics is
ncave profiles are
rners with several
antenna is also
nd WiMAX. The
50 GHz with good
e band-notched
ncy of the antenna
tched, monopole
one of the most
rate in wireless
many advantages
ge, and low cost
mmission (FCC)
GHz spectrum for
However, due to
ther narrowband
nd WiMAX (3.3-
characteristics are
nfigurations have
e the impedance
cture of a trident-
er [2] and using a
shaped radiation
ore, many UWB
n experimentally
etries. By etching
sing U- and fork-
er, a new novel
ndwidth up to 50
is proposed. The
first introduced in
ss (RL), radiation
cussed in Sec. III.
ON
le antenna and
na printed on 1.6
nstant of 4.4 and
loss tangent of 0.02. The radiating
microstrip transmission line with
overall dimensions of the propose
(ground plane size is 30×13
modifications have been done on the
achieve ultra-wide bandwidth. First
patch sharp edges have been sm
circled curves on its four corners. T
modified by clipping the top-corner
smooth the transition from one reso
Also, a slot in a rectangular form in
below the radiating patch was vertic
the impedance matching over the en
horizontally rectangular slots are e
vertical slot. In order to prevent inte
a rectangular strip with an area of (L
the U-shaped radiation patch arm
parasitic element is placed on the b
reject the WiMAX band.
Fig. 1. Geometry of the proposed U
with the dimensions given in mm:
L3= 2, L4= 13, L5= 5, L6= 10, L7=
W1= 10.8, W2= 3.6, W3= 7, W4= 2
WF= 3.4, R= 6.5, R1= 2.3, D1= 6.5
III. SIMULATED RESULT
In this section, Ansoft high fre
(HFSS) electromagnetic software
analyze the optimal proposed anten
the RL for the proposed antenna is
BW (RL < 10 dB) covers the range
two stop bands 3.3-3.7 GHz and 4.9
only confined to 50 GHz but it can
ual Band-
elazeez
ng Department
iversity
an
@gju.edu.jo
g patch is fed by a 50 Ω
a width of 3.4 mm. The
ed antenna is 35×30 mm2
mm2
). Many structural
e patch and ground plane to
tly, the U-shaped radiating
moothed by using concave
Then, the ground plane was
r edges in rounded form to
onant mode to another [3].
the middle of ground plane
cally designed. To guarantee
ntire ultra wide band a two
etched on both sides of the
erference caused by WLAN,
L8 × W7) is placed between
ms. Besides, an M-shaped
back side of the substrate to
UWB band-notched antenna
L = 35, L1= 18, L2= 1.7,
= 9, L8= 5, LF= 14, W= 30,
2, W5= 5, W6= 7, W7= 10,
5, D2 = 6.5, G= 0.7, h= 1.6.
TS AND DISCUSSION
equency structure simulator
is used to simulate and
nna. The simulated result of
s shown in Fig.2; simulated
e from 2.85 to 50 GHz with
9-6 GHz. However, it is not
reach more than 100 GHz.
2393
978-1-4799-7815-1/15/$31.00 ©2015 IEEE AP-S 2015

2. The first design (antenna A) is constructed to
wide band range for UWB applications. Th
developed to produce single band-notched
antenna C is designed which is a dual band-
For comparison, the simulated results of r
shown in Fig.3 for antennas A, B, and C.
Fig. 2 Simulated return loss of the proposed
Fig. 3 Simulated RL of the three antenna (A, B, and
The simulated gain and radiation efficien
Fig.4. It is clear that the antenna has a g
passband fluctuating between 2.5 to 4 dBi and
at 7.8 GHz. While, in the rejection bands the g
dBi at 3.4 GHz and to -2.2 dBi at 5.5 GHz. O
the radiation efficiency drops to 46% at 3.5 GH
5.5 GHz. Also, the antenna radiation patterns
GHz were simulated and illustrated in Fig.5. It
radiation pattern in the yz plane (H-p
omnidirectional. But, the antenna exhibit
radiation pattern in the xy plane (E-plane).
IV. CONCLUSION
A compact planar monopole UWB antenna
notched characteristics has been investigated.
BW, from 2.85 to 50 GHz, is achieved. I
rejection bands are created 3.3-3.7 GHz and
embedding a rectangular strip and M-shaped
front and back sides of the substrate respective
ACKNOWLEDGEMENT
This work has been carried out during sabbati
to Mohamed K. Abdelazeez from the Univ
during the academic year 2014/2015.
o cover an ultra-
hen antenna B is
antenna; finally
notched antenna.
return losses are
d antenna.
d C).
ncy are shown in
good gain in the
d rises to 5.6 dBi
gain drops to -4.5
On the other hand,
Hz and to 40 % at
s at 4 GHz and 7
t is noted that the
lane) is nearly
ts a dipole-like
with dual band
Wide impedance
In addition, two
d 4.9-6 GHz by
d element in the
ely.
cal leave granted
versity of Jordan
Fig. 4. Antenna gain of the proposed du
Fig. 5 Radiation pattern of the proposed
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