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An Optimal Design of CPW-FED UWB Aperture Antennas with Wimax/WLAN Notched Band Characteristics
Tapan Mandal;Santanu Das
PIER C , 2013, DOI: 10.2528/PIERC12110605
Abstract: In this paper, a printed slot antenna fed by a co-planar waveguide for ultra wide bandwidth (UWB) with dual notch bands has been presented and discussed. The band notches are realized by etching one C-slot resonator inside a plaque shape exciting stub as well as symmetrically adding a pair of open-circuit stubs at the edge of the slot resulting in dual stop band filtering properties for WiMAX, WLAN application. Surface current distributions are used to analyze the effects of the slot and open circuit stub. The proposed antenna is fabricated and experimental results show that it has an impedance bandwidth of 2.6-14.34 GHz for VSWR ≤ 2, except dual frequency stop-bands of 3.3-3.7, 5.04-6.0 GHz. From the simulation results, it is observed that the radiation patterns are omnidirectional in the -plane and dipole like nature in the -plane. The gain varies from 3.7 dB to 5.7 dB over the whole UWB region excluding at notch bands.
A Compact CPW-FED UWB Antenna with Wimax-Band Notched Characteristics
Wei-Mei Li;Tao Ni;Ting Quan;Yong-Chang Jiao
PIER Letters , 2011, DOI: 10.2528/PIERL11080202
Abstract: This paper presents a novel CPW-fed band-notched UWB antenna for the 3.5 GHz wireless local area network (WiMAX) applications. The prototype consists of planar diamond shaped monopole and ground plane. By inserting a novel coupling band-notched filter, which consists of an isosceles trapezoid slot in the radiation patch and a same sized isosceles trapezoid patch on the back of the substrate, with the slot connecting to the patch below through shorting hole, band-rejected filtering property in the WiMAX band is achieved. The proposed antenna is successfully designed with broadband matched impedance, good radiation patterns and constant group delay.
Dual-Band Planar Monopole Antenna for Bluetooth and UWB Applications with Wimax and WLAN Band-Notched
Ling Xiong;Peng Gao
PIER Letters , 2012, DOI: 10.2528/PIERL11111702
Abstract: A small-sized, low-cost, and planar integrated Bluetooth and ultrawideband (UWB) monopole antenna with band-notched characteristics in the 3.5 GHz WiMAX and 5.2/5.8 GHz WLAN band is proposed. It is fed by a microstrip line and built on a FR-4 substrate with a whole size of 18*30 mm. This proposed antenna consists of a slot on the edge of the radiation patch, which not only makes it achieve Bluetooth and UWB performance but also produces a high isolation between them. Additionally, two split rectangular ring resonators (SRRR) are placed close to the microstrip line to reject the WLAN band. Measured is ≤-10 dB over 2.28-2.52, 3.66-5.02, and 6.05-12 GHz. The group delay characteristic indicates good transient response in the working band. The antenna shows acceptable gain flatness with stable omnidirectional radiation patterns across the integrated Bluetooth and UWB (3.1-10.6 GHz) band.
A CPW-FED Dual Band-Notched UWB Antenna with a Pair of Bended Dual-L-Shape Parasitic Branches
Xiang Long Liu;Ying-Zeng Yin;Ping An Liu;Jun Hui Wang;Bin Xu
PIER , 2013, DOI: 10.2528/PIER12122507
Abstract: In this paper, a novel coplanar waveguide (CPW) fed dual band-notched ultra-wideband (UWB) antenna with circular slotted ground is proposed. In order to achieve two notched bands at 3.3-3.7 GHz for worldwide interoperability for microwave access (WiMAX) and 5.15-5.825 GHz for wireless local area network (WLAN) respectively, a pair of bended dual- L-shape branches are attached to the slotted ground. By optimizing the lengths and positions of the branches, the desired notch-bands of WLAN and WiMAX can be achieved. The prototype of the proposed antenna was fabricated and tested. The simulated and measured results show good agreement over the ultra-wideband. Besides these mechanical features, such as compact in size, easy in fabrication, the proposed antenna also shows good characteristics in its radiation patterns and time-domain behaviors. So it is a nice candidate for modern UWB communication systems.
A Compact CPW-Fed UWB Antenna with Dual Band-Notched Characteristics  [PDF]
Aiting Wu,Boran Guan
International Journal of Antennas and Propagation , 2013, DOI: 10.1155/2013/594378
Abstract: A compact CPW-fed planar UWB antenna with dual band-notched property is presented. The dual band rejection is achieved by etching a C-shaped slot on the radiation patch and two L-shaped parasitic strips in the ground plane. The experimental and measured results show that the proposed antenna exhibits an impedance bandwidth over an ultrawideband frequency range from 2.4 to 12.5?GHz with VSWR less than 2, except for two stopbands at 3.3 to 3.75?GHz and 5.07 to 5.83?GHz for filtering the WiMAX and WLAN signals, respectively. It also demonstrates a nearly omnidirectional radiation pattern. The fabricated antenna has a tiny size, only 32?mm × 32?mm × 0.508?mm. The simulated results are compared with the measured performance and show good agreement. The simple structure, compact size, and good characteristics make the proposed antenna an excellent candidate for UWB applications. 1. Introduction Recently ultrawideband (UWB) communication systems have gained a great deal of attention due to their high data transmission rates, low consumption, good security, and immunity to multipath fading. Ever since 2002 when the US Federal Communication Commission (FCC) authorized the unlicensed use of UWB in the frequency band from 3.1 to 10.6?GHz [1], a lot of research efforts have been put into UWB communication systems which led to a great demand of UWB antennas. As one of the promising candidates, CPW-fed planar antennas have been investigated and reported in [2–6]. However, over the allocated frequency band, there are some existing narrow band services which may bring potential interferences to the UWB band, such as the IEEE 802.16 WiMAX system operating at 3.3–3.7?GHz and the IEEE 802.11a WLAN system operating at 5.15–5.825?GHz. To eliminate the interfaces antenna filtering technique has become an excellent candidate due to its simplicity, effectiveness, and low cost. Several methods have been proposed to design UWB antennas with band-notched functions, including etching C-shaped, L-shaped, T-shaped, H-shaped, U-shaped, E-shaped, and half-circle slots on the radiation patch or on the ground plane [7–15], or by employing T-shaped, L-shaped, and spiral parasitic strips or open circuit stubs to the antennas [16–20]. In this paper, a compact novel CPW-fed planar ultrawideband antenna with dual band-notched characteristics is proposed and investigated in detail. Compared with the previous published antenna structures [7–20], the height of the proposed antenna is very small, only 0.508?mm, and its overall size is also quite compact, just 32?mm × 32?mm × 0.508?mm. By etching
A Compact Ultrawideband Monopole Antenna with 5.5 GHz Notched Band
Pichet Moeikham;Chatree Mahatthanajatuphat;Prayoot Akkaraekthalin
PIER C , 2012, DOI: 10.2528/PIERC11091602
Abstract: This paper proposes a compact ultrawideband monopole antenna fed by CPW with a 5.5 GHz notched band of WLAN/WiMAX systems. The antenna input section is designed by using a gradual curvature central line and ground planes for ultrawideband achievement. In order to reject the unwanted frequency of the existing WLAN/WiMAX band, the C-shaped slit with perimeter length of a half wavelength at center frequency of 5.5 GHz has been embedded into the monopole patch. The designed antenna is completely implemented and measured for impedance bandwidth covering UWB range and stably performs omnidirectional pattern in $xz$ plane from 3.1 to 10 GHz. The proposed antenna could potentially minimize frequency interference in the WLAN/WiMAX bands.
Dual Band-Notched Design of Rectangular Monopole Antenna for UWB Applications
Chao Deng;Yong-Jun Xie;Junfei Yuan
PIER C , 2010, DOI: 10.2528/PIERC10052901
Abstract: An ultra wideband (UWB) coplanar waveguide (CPW) fed rectangular monopole antenna, which is of band notched characteristic for Wireless Local Area Network (WLAN), Worldwide inter-operability for Microwave Access (WiMAX) and the C-band satellite communications, is proposed, fabricated and measured. In order to obtain the desired dual band rejections, a piece of pentagonal slotline and a pair of inverted L-shaped stubs are loaded on the CPW fed rectangular monopole antenna of enhanced impedance bandwidth. The antenna is printed on the FR4 substrate of 40 mm (width) × 41 mm (length) × 0.5 mm (thickness), and is optimized by ANSOFT HFSS. A prototype is fabricated according to the optimized parameters values, and the antenna characteristics are measured. The results show that the antenna is of UWB characteristic and exhibits band rejection of 3.2-4.25 GHz and 5.1-6.15 GHz, which covers WLAN, WiMAX, and C-band satellite communications.
A Compact CPW-FED UWB Antenna with GSM, GPS, Bluetooth and Dual Notch Bands Applications
Yong-Lun Luo;Liang Xu;Zheng-Yu Xin;Shuang He
PIER C , 2013, DOI: 10.2528/PIERC12110702
Abstract: A novel compact ultrawideband (UWB) CPW-fed antenna with triple lower pass bands and dual notched bands for wireless applications is presented. The low-profile antenna comprises of an approximate hexagonal-shaped radiator for covering the UWB band (3.1~10.8 GHz). Triple lower pass bands, the 1.5G band, 1.8 GHz GSM band and 2.4 GHz Bluetooth band, can be realized by adding three handstand semielliptical-shaped stubs bilaterally at the upper part of antenna ground. A notched band of 3.3~3.7 GHz for rejection of WIMAX radio signals can also be obtained by adjusting the geometry of the three stubs. In addition, an U-shaped slot on the radiating patch generates a notched band in 5.15~5.825 GHz for rejection of WLAN radio signals. The proposed antenna is designed and built on a FR-4 substrate, with overall size of 25 mm×24 mm. The simulated and measured results are presented and show that the proposed compact antenna has a stable and omnidirectional radiation patterns across all the relevant bands.
Broadband CPW-FED Antenna with Band-Rejected Characteristic for WLAN/ Wimax Operation
An-Feng Sun;Ying-Zeng Yin;Shao-Hong Jing;Yi Yang;Bo-Wen Liu;Zhi Li
PIER C , 2011, DOI: 10.2528/PIERC11050405
Abstract: A novel single-layer broadband coplanar waveguide-fed antenna with band-rejected characteristic is proposed for WLAN/WiMAX operation. First, the broadband characteristic (2.43-5.97 GHz) is achieved by a CPW-fed patch antenna with a dual-Y slot. Then, a single slit is inserted on the radiating patch or ground plane to introduce a notched band. The proposed antenna has a compact size of 40 × 25 mm. The broadband characteristic and band-rejected functions of the proposed antennas are implemented and measured. Two types of antennas were studied. Measured notched-band impedance bandwidths (return loss <10 dB) are 370 MHz and 1050 MHz, respectively, which satisfies the requirements for WLAN and WiMAX applications. Detailed design steps and experimental results for the designs are studied and investigated in this paper.
A Compact UWB Monopole Antenna with Wimax and WLAN Band Rejections
Si-Ming Zhang;Fu-Shun Zhang;Wen-Zhu Li;Ting Quan;Hui-Ying Wu
PIER Letters , 2012, DOI: 10.2528/PIERL12032003
Abstract: A compact ultrawideband (UWB) monopole antenna with two U-shaped slots for WLAN and WiMAX dual band-notched functions is proposed and experimentally studied. The proposed antenna with the size of 28 mm×24 mm×1.6 mm is excited by a 50Ω microstrip feed line. The band-notch functions are realized by loading two approximate half-wavelength U-shaped slots which change the current distribution on the Y-shaped patch. The obtained results show that the designed antenna has an impedance bandwidth of 2.95 GHz-12 GHz for ≤ -10 dB, except two frequency stop-bands of 3.32 GHz-3.98 GHz for WiMAX and 4.81 GHz-6.68 GHz for WLAN. The antenna has successfully fabricated and measured. The return loss, band-notched characteristic, radiation patterns and peak gains are presented.
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