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06-08-2014, 03:24 PM
MINIATURE TRIPLE-BAND CPW-FED MONOPOLE
ANTENNA FOR WLAN/WIMAX APPLICATIONS
[attachment=66667]
Abstract
—A miniature single-layer CPW-fed monopole antenna
with triple-band operation for wireless local area network (WLAN)
and worldwide interoperability for microwave access (WiMAX)
applications is presented. The proposed antenna, comprising a planar
rectangular patch element embedded with dual U-shaped slot, is
capable of generating three distinct operating bands, 2.37–2.53, 3.34–
3.82, and 4.23–6.88 GHz covering all the 2.4/5.5/5.8 GHz WLAN bands
and the 3.5/5.5 GHz WiMAX bands. The designed antenna has a
simple uniplanar structure and occupies a small size of 25 × 18 mm2
including the finite ground CPW feeding mechanism. Moreover, the
proposed antenna shows good monopole-like radiation patterns with
small cross-polarization and stable antenna gains across the three
operating bands.
. INTRODUCTION
Recently, with the rapid development of WLAN (2.4–2.484, 5.15–
5.35, and 5.725–5.825 GHz) and WiMAX (2.5–2.69, 3.4–3.69, and
5.25–5.85 GHz) systems, the demands for antennas with multiband
operation, small size, low cost, simple configuration and easy
fabrication have increased drastically. Thus, various designs of
multiband antenna suitable for WLAN/WiMAX operation have
been introduced [1–10] , such as monopole antennas with double-T
shaped [1], double-S shaped [2], C-shaped [3], E-shaped [4], meandered
T-shaped [5] and back-to back dipole [6] radiating structures. However,
none of the above available designs can provide a multi-band operation
to support WiMAX application. In [7, 8], these antennas can generate
wide bands to cover the WLAN and WiMAX bands, however, their
Received 25 February 2012, Accepted 9 April 2012, Scheduled 13 April 2012
* Corresponding author: Xin Qian Zhang (april.xinqian[at]gmail.com).98 Zhang, Jiao, and Wang
wide operating bands cover many other existing narrowband services
such as C-band satellite communications. To address this issue,
additional band pass filters are required to be added into the system
to avoid frequency collision and to minimize interference. Therefore
several triple-band antennas which have better rejections in undesired
bands for WLAN/WiMAX applications have been proposed [9–
13]. In [9], the proposed coplanar inverted-F antenna is capable of
generating three distinct bands for WLAN/WiMAX applications, but
with poor radiation patterns and high cross-polarization across the
operating bands. In [10], with the embedded rectangular and circular
patches, the antenna can achieve triple frequency operation, but with
poor E-plane radiation patterns especially in the upper band. In [11–
13], these designs of triple band antenna are either complex in structure
or large in size, which limit their availabilities for practical application.
In this paper, a miniature uniplanar printed CPW-fed antenna for
WLAN/WiMAX applications is proposed. Limited to only 25×18 mm2
area, the proposed antenna consisting of a slotted monopole and a
modified CPW ground plane is capable of generating three distinct
operating bands 2.37–2.53, 3.34–3.82, and 4.23–6.88 GHz to cover the
WLAN/WiMAX bands. The antenna is simple in structure with
reduced size compared to that of a conventional printed monopole
antenna. Good pattern performance with small cross-polarization
suitable for WLAN and WiMAX systems can also be obtained. Details
of the antenna design and experimental results are also presented and
discussed.
CONCLUSION
A simple triple-band CPW-fed monopole antenna for WLAN/WiMAX
applications has been presented. By simply embedding two U-shaped
slots into a rectangular patch, the antenna can generate three distinct
bands to cover the 2.4/5.2/5.8 GHz WLAN bands and the 3.5/5.5 GHz
WiMAX bands. The small size, simple structure, multiband coverage,
almost monopole-like radiation properties and stable antenna gains
across the operating bands make the proposed antenna to be an
attractive candidate for practical applications in the WLAN/WiMAX
communication system
ANTENNA FOR WLAN/WIMAX APPLICATIONS
[attachment=66667]
Abstract
—A miniature single-layer CPW-fed monopole antenna
with triple-band operation for wireless local area network (WLAN)
and worldwide interoperability for microwave access (WiMAX)
applications is presented. The proposed antenna, comprising a planar
rectangular patch element embedded with dual U-shaped slot, is
capable of generating three distinct operating bands, 2.37–2.53, 3.34–
3.82, and 4.23–6.88 GHz covering all the 2.4/5.5/5.8 GHz WLAN bands
and the 3.5/5.5 GHz WiMAX bands. The designed antenna has a
simple uniplanar structure and occupies a small size of 25 × 18 mm2
including the finite ground CPW feeding mechanism. Moreover, the
proposed antenna shows good monopole-like radiation patterns with
small cross-polarization and stable antenna gains across the three
operating bands.
. INTRODUCTION
Recently, with the rapid development of WLAN (2.4–2.484, 5.15–
5.35, and 5.725–5.825 GHz) and WiMAX (2.5–2.69, 3.4–3.69, and
5.25–5.85 GHz) systems, the demands for antennas with multiband
operation, small size, low cost, simple configuration and easy
fabrication have increased drastically. Thus, various designs of
multiband antenna suitable for WLAN/WiMAX operation have
been introduced [1–10] , such as monopole antennas with double-T
shaped [1], double-S shaped [2], C-shaped [3], E-shaped [4], meandered
T-shaped [5] and back-to back dipole [6] radiating structures. However,
none of the above available designs can provide a multi-band operation
to support WiMAX application. In [7, 8], these antennas can generate
wide bands to cover the WLAN and WiMAX bands, however, their
Received 25 February 2012, Accepted 9 April 2012, Scheduled 13 April 2012
* Corresponding author: Xin Qian Zhang (april.xinqian[at]gmail.com).98 Zhang, Jiao, and Wang
wide operating bands cover many other existing narrowband services
such as C-band satellite communications. To address this issue,
additional band pass filters are required to be added into the system
to avoid frequency collision and to minimize interference. Therefore
several triple-band antennas which have better rejections in undesired
bands for WLAN/WiMAX applications have been proposed [9–
13]. In [9], the proposed coplanar inverted-F antenna is capable of
generating three distinct bands for WLAN/WiMAX applications, but
with poor radiation patterns and high cross-polarization across the
operating bands. In [10], with the embedded rectangular and circular
patches, the antenna can achieve triple frequency operation, but with
poor E-plane radiation patterns especially in the upper band. In [11–
13], these designs of triple band antenna are either complex in structure
or large in size, which limit their availabilities for practical application.
In this paper, a miniature uniplanar printed CPW-fed antenna for
WLAN/WiMAX applications is proposed. Limited to only 25×18 mm2
area, the proposed antenna consisting of a slotted monopole and a
modified CPW ground plane is capable of generating three distinct
operating bands 2.37–2.53, 3.34–3.82, and 4.23–6.88 GHz to cover the
WLAN/WiMAX bands. The antenna is simple in structure with
reduced size compared to that of a conventional printed monopole
antenna. Good pattern performance with small cross-polarization
suitable for WLAN and WiMAX systems can also be obtained. Details
of the antenna design and experimental results are also presented and
discussed.
CONCLUSION
A simple triple-band CPW-fed monopole antenna for WLAN/WiMAX
applications has been presented. By simply embedding two U-shaped
slots into a rectangular patch, the antenna can generate three distinct
bands to cover the 2.4/5.2/5.8 GHz WLAN bands and the 3.5/5.5 GHz
WiMAX bands. The small size, simple structure, multiband coverage,
almost monopole-like radiation properties and stable antenna gains
across the operating bands make the proposed antenna to be an
attractive candidate for practical applications in the WLAN/WiMAX
communication system