Compact Printed Ultra-Wideband Antenna with Three Subband Notches Nguyen Dang Trang, Dong Hyun Lee, and Hyun Chang Park Division of Electronics and Electrical Engineering, Dongguk University Seoul, Korea
[email protected],
[email protected] Abstract- A compact printed monopole U1tra-Wideband
subbands is using three band-stop filters connected to UWB
antenna with three subband notches is proposed and analyzed
antenna. However, this is bound to increase the complexity
in this paper. The proposed antenna has the bandwidth from 3
GHz to over 11 GHz By using two simple types of slot, triple subband-notched characteristic is obtained. A simple straight slot is etched on the radiating patch to acquire the subband notch at 3 .3 -3 .7 GHz for WiMAX band. In addition, three
of the system. A simpler way to solve this problem is to design
the
UWB
antenna
with
sub band
notched
characteristics to minimize potential interference. Several UWB antennas with subband notched function have been
simple semicircular slots are etched on the radiating patch to
reported recently. But most reported antennas were designed
achieve another two subband notches at 5.15-5.825 GHz for
with only one notched band [3]-[8] at WLAN frequency
WLAN and 7.25-7.75 GHz for downlink of X-band satellite
band 5.15-5.825 GHz. Lately,
communication systems. The antenna is successfully simulated
notched sub band [9], [10] and an antenna with triple subband
and fabricated. The designed antenna has a compact size of 25 x 2 29 mm and a nearly omnidirectional radiation pattern in the
notched characteristics [11] were presented . However, in [9]
whole bandwidth.
two antennas with
dual
the dual notched sub band were formed by two C-shaped slots in the radiating patch with slot width only 0.1 mm which
Keywords- Monopole antenna, printed antenna, subband notched antenna, ultra-wideband, wireless communications.
may cause high cost in accurate fabrication of this antenna. In [10] and [11] the subband notch at 5 GHz band of WLAN
was obtained by a 0.2 mm width U-slot defected ground I. INTRODUCTION
structure (DGS) at exactly opposite position to the feed line
In the last ten years, wireless communications have
gained a wider and wider popularity. The current trend is that
through substrate of the antennas, which also is bound to increase the complexity in fabrication of these antennas.
the wireless link is provided for every kind of electronics
In this paper a compact printed monopole UWB antenna
devices. In particular, there is a growing demand from users
with triple subband notched characteristic is proposed. By
for more complicated and greater capacities of services,
using two types of simple slots cut on the radiating patch,
which requires the design of higher performance systems.
which are straight slot and semicircular slot, three sub band
Since the approval of the ultra-wideband (UWB) technology
notches are achieved. The antenna covers the allocated UWB
and allocation of the frequency band between 3.1-10.6 GHz
frequency band (with S 11
for indoor UWB communication systems [1], the UWB has
subbands and also satisfies the UWB system requirements.
become one of the most promising technologies for future
researchers. The UWB antenna required for compact size, '" N
designated frequency band, there exist some narrow bands at the 3.3-3.7 GHz band, WLAN operating at the 5.15-5.825 GHz
band,
and
the
downlink
of
X-band
satellite
communication systems at 7.25-7.75 GHz. These subbands may cause electromagnetic interference (EMI) with the UWB system. One way to reject the EMI caused by these
978-1-4244-7057-0/101$26.00 ©2010
(c)
53a 52 5,
system, the UWB antenna has drawn heavy attention from
for other communication systems, such as WiMAX operating
(b)
d1
and imaging systems. As an essential part of the UWB
omnidirectional radiation pattern [2]. However, over the
-10 dB) except the three notched
O.B
high data-rate wireless communication, high-accuracy radars
low cost, wideband properties, steady directional or good
