Design and Analysis of A Compact Planar Dualband-Notched Uwb Antenna
Design and Analysis of A Compact Planar Dualband-Notched Uwb Antenna
Design and Analysis of A Compact Planar Dualband-Notched Uwb Antenna
Abstract In this paper a compact planar Ultra-wideband the UWB antenna may increase the complexity and cost of
(UWB) antenna with double band-notched characteristics has manufacturing [2], a simpler way is to use antenna filtering
been presented. The design consists of a unique lamp post shaped technique which is simple and inexpensive since the antenna
radiator fed through a microstrip feedline with one U-shaped slot size itself is quite small. Till now a number of methods have
and a C-shaped slot etched on the radiator and a slotted ground
plane. The proposed antenna has been successfully simulated and
been reported for band notched functions which includes
fabricated. The proposed antenna of size 30 mm x 30 mm printed etching C shaped [3,4], T shaped [5], L shaped [6,7], Pi
on 1.6 mm FR4 substrate reports a large bandwidth from 2.6 shaped [8], H and U shaped [9], and E shaped [10] slots and
GHz to 10.7 GHz with VSWR 2 over the entire range except at also circular slots on the radiating patch [11], ground plane or
two notched bands for WiMax systems at 3.3-3.7 GHz and feedline. Other methods involve embedding stubs of different
WLAN systems at 5.15-5.85 GHz. The gain of the antenna shapes or resonating strips near the feedline or near ground
increases steadily rom 2 dBi to 5.5 dbi over the entire impedance plane [12-14] and split ring resonator (SRR) or stepped
bandwidth except at notched bands where a sharp dip in gain is impedance resonator (SIR) close to feedline [15,16].Use of
noticed. The proposed antenna exhibits nearly omni-directional above mentioned techniques in different combinations can
radiation pattern and a stable gain over the entire impedance
bandwidth except for the two notched bands.
yield single notched band [17-18 ] double notched band [19-
20 ] or triple notched band [21-23] capability.
Keywords Ultra-wideband (UWB), dual band-notched A large number of such antennas have been reported in
antenna, planar UWB antenna, slotted ground plane, C-shaped various research works till now. However, the size of the
slot, U-shaped slot, WLAN, WiMax. antennas is relatively large and the notched bands are quite
wide in terms of bandwidth and the useable bandwidth is
I. INTRODUCTION reduced to a large percentage. As a result, intense simulation
is needed to make the structure compatible having low profile,
Since the time Federal Communications Commission stable gain and radiation pattern. This paper is based on
(FCC) in Mar 2002 approved [1] the release of S11 -10 dB simulation and fabrication of a novel design of a dual notched
un -licencened bandwidth of 7.5 GHz ranging from 3.1 to 10.6 band antenna having a unique lamp post shaped structure
GHz with an effective isotropic radiated power (EIRP) using CST Microwave Studio. The double band-notched
spectral density of -41.3 dBm/MHz for commercial use in characteristics have been achieved by making use of one
radio communication, intense research in the field of UWB inverted U slot and one C slot etched on the radiating patch.
communication has been witnessed all over the world to make The length of the slot is taken to be one half of the guided
use of this bandwidth for enhanced data rate and variety of wavelength of the centre frequency of the respective notched
other purposes. The interest of researchers in UWB bands. The length of the each slot can be calculated using the
communication also emanates from the inherent advantage of expression (1) as under:
small size, low power consumption, simple structure and ease
of integration together with high transmission rate and (1)
relatively good omni-direction property.
While this bandwidth of 7.5 GHz is the core motivation for
developing high data rate devices, there exist other
narrowband services which may potentially interfere with
UWB communication such as WiMax communication at 3.5
GHz (3.3 to 3.7 GHz) and WLAN IEEE 802.11/a operating at
5.2 GHz (5.15 to 5.35 GHz and 5.725 to 5.875 GHz) . where fnotch is the centre frequency of the notch band, Lslot is
Antenna being an essential component of UWB the length of the slot, eff is the effective dielectric constant
communication, it is thus desired to design the same having and c is the velocity of light in free space.
band notched function to avoid interference with the existing The position and dimensions of each slot can be altered
wireless network technologies. While integrating filters with independently and optimized. The proposed antenna is
compact in size having LxW as 30 x 30 mm2 with -10 dB
impedance bandwidth of more than 7.5 GHz with two notched
Sanjiv Tomar and Ajay Kumar are with Department of Electronics bands for avoiding interference from respective narrow band
and Communication Engineering, Manipal University, Jaipur, India, services.
E-mails: sanjivtomar@gmail.com and ajaykumar@manipal.jaipur.in
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Mikrotalasna revija Decembar 2015.
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December, 2015 Microwave Review
notched bands. It is due to the fact that the etched slots are
located at different location and coupling between them is
quite weak. It can therefore be inferred that the notched band
can be controlled individually by controlling the dimension
and location of the slots. Dimension of gap g is also changed
to study its effect on VSWR. As seen in Fig. 7 that on
increasing the dimension of gap g between lower edge of
radiator patch and upper edge of ground plane, the notched
bands cantered at 3.5 GHz and 5.5 GHz shifts to lower
frequency while decrease in gap dimension shifts the centre
frequency to higher ones.
(a) (b)
(c) (d)
Fig. 8. Surface current distribution. (a) Pass band frequency of 3
GHz. (b) Pass band frequency of 9.5 GHz. (c) Stop band frequency
of 3.5 GHz. (d) Stop band frequency of 5.5 GHz
Fig. 6. Optimization of slot L5
The radiation pattern and gain of compact antenna is
measured using standard Horn antenna. The normalized
radiation pattern at 3 GHz, 6.5 GHz and, 9.5 GHz in the E-
plane and H-plane are shown in Fig. 9. The measured
radiation pattern at the pass band frequencies shows that the
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Mikrotalasna revija Decembar 2015.
The measured gain vs simulated gain of the antenna is The group delay of the antenna is shown in Fig. 12. It is
shown in Fig. 10. The gain pattern indicates that the antenna seen that the group delay is constant over the entire operating
has a stable gain over the entire UWB except at notched bands band except at the notched frequencies where the group delay
where sharp dips are observed. The measured gain of the is around 2 ns. The antenna establishes a good linear phase
antenna ranges from 3 dBi to 5 dBi and significant drop in its response except at notched bands. Good phase linearity
magnitude is observed at two notched bands. coupled with low dispersion indicates that the antenna is able
to retain UWB pulse preserving capability and thus is able to
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December, 2015 Microwave Review
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