oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Ultra Wideband CPW-FED Aperture Antenna with WLAN Band Rejection
Mohamed Adnane Habib;A. Bostani;Azzeddine Djaiz;Mourad Nedil;Mustapha C. E. Yagoub;Tayeb Ahmed Denidni
PIER , 2010, DOI: 10.2528/PIER10011905
Abstract: In this paper, we present a new ultra wideband antenna design with band rejection for UWB applications. A CPW-fed circular patch radiates through a circular aperture, which ensures wideband impedance matching and stable omnidirectional pattern over an UWB frequency range, from 3GHz to 10.6 GHz. In order to avoid interference with WLAN applications, at 5.8 GHz, the antenna is slightly modified to reject undesired band. A semi-circular slot ring is etched on the circular patch at the notch frequency, which creates an open circuit and avoids impedance matching and current propagation. A prototype was fabricated and measured, and the obtained experimental results agree with simulations and show an omnidirectional azimuth pattern over the entire bandwidth.
A CPW-Fed Novel Planar Ultra-Wideband Antenna with a Band-Notch Characteristic
F. Yu,C. Wang
Radioengineering , 2009,
Abstract: A coplanar waveguide (CPW) fed novel planar ultra-wideband antenna with a band-notch characteristic is presented. The proposed antenna consists of a rectangular metal radiation patch and a tapered arc-shaped ground plane. To achieve ultra wideband, three modifications are introduced, the first one is to remove a 90-degree fan angle on the upper corners of the patch, the second one is to shape the bottom of the patch into an arc, and the third modification is to remove a small fan angle on each side of the ground plane near the feeding line. Simulation results show that the proposed antenna operates over 3.0 to 23 GHz for VSWR < 2. By embedding a C-shaped slot in the radiating patch, a frequency band notch between the bandwidth of 5 to 6 GHz for Wireless LAN (WLAN) will be obtained. All simulations in this work were carried out by using the electromagnetic software Ansoft HFSS 11. Compared with the recently proposed antennas, this antenna has advantages in wide bandwidth, good band-notch characteristic, compact in size and easy design. Details of the proposed antenna are presented, and simulated results show that the antenna has stable radiation patterns and good gain flatness over its whole frequency band.
Designs on CPW-FED Aperture Antenna for Ultra-Wideband Applications
Zhong Li;Chen-Xin Zhang;Guang-Ming Wang;Wen-Ran Su
PIER C , 2008, DOI: 10.2528/PIERC08030501
Abstract: A novel co-planar waveguide (CPW) ultra-wideband (UWB) aperture antenna is presented. The antenna consists of a rectangular aperture on a printed circuit board ground plane and a mushroom-shaped exciting stub. The mushroom-shaped stub is simple and has less parameter, which is convenient to analyze and optimize. The antenna has a compact aperture size 22 × 13mm, fabricated on FR4 substrate with dielectric constant of 4.3, thickness of 1.5 mm. The antenna is successfully implemented and measured, which has 8.3 GHz match bandwidth (VSWR < 2), and stable radiation patterns.
CPW Fed Hexagonal Patch Shape with Hexagonal slot Ultra Wideband Antenna  [cached]
Suman Gill,J S Ubhi
International Journal of Computers & Technology , 2012,
Abstract: In this paper hexagonal patch shape with hexagonal slot, ultra wideband antenna is proposed. The total dimensions of antenna are 55×43.5mm. Sides of hexagonal patch are taken 13mm each and hexagonal slot sides are taken as 3mm each. The antenna resonates at two frequencies in ultra wideband range (UWB). There is enhancement in BW in upper range ultra wideband frequency from 6.2 GHz to 8.2GHz due to hexagonal slot cut in hexagonal patch. The design is carried out using Computer Simulation Technology (CST) Microwave Studio (MWS) suite. Co-Planar Waveguide (CPW) feed is used to feed antenna.
Broadband CPW-FED Circularly Polarized Antenna with Equiangular Tapered-Shaped Feedline for Ultra-Wideband Applications
Qiong Chen;Hui-Li Zheng;Ting Quan;Xia Li
PIER C , 2012, DOI: 10.2528/PIERC11110603
Abstract: A novel coplanar waveguide (CPW)-fed circularly polarized (CP) antenna is proposed. The antenna is composed of a square ground plane with a circular slot and an equiangular tapered-shaped feedline. With the use of a special shaped feedline, the axial ratio (AR) bandwidth of the proposed antenna is about 61.9% (2.9-5.5 GHz), which is larger than most of similar antennas proposed before. In addition, the impedance bandwidth, determined by 10-dB return loss, is between 2.9-20 GHz, which makes the antenna be used for ultra-wideband (UWB) applications.
A CPW-FED Ultra-Wideband Planar Inverted Cone Antenna
Hao Wang;Hong Zhang;Xuan Liu;Kun Huang
PIER C , 2010, DOI: 10.2528/PIERC09121404
Abstract: This paper presents a CPW-fed planar inverted cone antenna (PICA) for ultra-wideband (UWB) communication applications. The proposed PICA provides a conventional monopole type omnidirectional radiation pattern, and it utilizes the advantages of the coplanar-waveguide (CPW) to simplify the structure of the antenna into a single metallic level. To improve radiation characteristics, a tapered and corrugated ground plane is used. In addition, the PICA's radiating element with three self-similarity holes is attempted to enhance performance of the antenna. The simulated and measured results demonstrate that the proposed PICA achieves a broad impedance bandwidth from 1.3 GHz to 11GHz within the magnitude of S (dB) less than -10 dB and maintains nearly omnidirectional radiation characteristics.
Compact CPW-FED UWB Antenna with Dual Band-Notched Characteristics
Zhi-An Zheng;Qing-Xin Chu
PIER Letters , 2009, DOI: 10.2528/PIERL09071809
Abstract: In this paper, a coplanar waveguide fed (CPW-Fed) ultra-wideband (UWB) antenna with dual band-notched characteristics is proposed. Two symmetrical slots are etched from the ground plane to achieve the notched band at 5.5 GHz. The other notched band at 3.5 GHz is obtained by etching a split ring slot in the radiator. The simulation and measurement show that the proposed antenna achieves an impedance bandwidth of 3.1-10.6 GHz with VSWR < 2, except in the bands of 3.2-3.8 GHz and 4.8-6.2 GHz. A nearly omnidirectional radiation pattern and stable gain with variation less than 3 dB are also observed except in the two notched bands. Moreover, time-domain characteristics of the antenna are analyzed and discussed as well.
An Ultra-Broadband, Coplanar-Waveguide FED Circular Monopole Antenna with Improved Radiation Characteristics
Nan-Wei Chen;Yi-Chung Liang
PIER C , 2009, DOI: 10.2528/PIERC09071610
Abstract: A planar, circular monopole antenna (PCMA) with satisfactory radiation characteristics over an ultra-broadband is demonstrated. Compared to the classical coplanar-waveguide (CPW) fed PCMA, the radiation characteristics of the proposed CPW-fed PCMA are significantly improved, particularly at the frequencies around the higher band edge. This improvement is achieved by exploiting a tapered and periodically corrugated edge design to the CPW ground plane. The tapered and corrugated ground-plane edge design, in essence, modifies the current distribution on the circular disc as well as along the edges of the ground plane. With this design, the cross polarization radiation is remarkably reduced, and the pattern deterioration, especially at the planes perpendicular to the plane of the antenna, is greatly alleviated. The demonstrated CPW-fed PCMA features an over 150 % VSWR=2 fractional bandwidth (0.81-5.87 GHz) and promises satisfactory radiation characteristics over the entire band. The proposed PCMA is poised for applications in wideband/ultra-wideband communication systems.
Elevated CPW-Fed Slotted Microstrip Antenna for Ultra-Wideband Application  [PDF]
Chandan Kumar Ghosh,Arabinda Roy,Susanta Kumar Parui
International Journal of Antennas and Propagation , 2012, DOI: 10.1155/2012/425919
Abstract: Elevated-coplanar-waveguide- (ECPW-) fed microstrip antenna with inverted “G” slots in the back conductor is presented. It is modeled and analyzed for the application of multiple frequency bands. The changes in radiation and the transmission characteristics are investigated by the introduction of the slots in two different positions at the ground plane (back conductor). The proposed antenna without slots exhibits a stop band from 2.55?GHz to 4.25?GHz while introducing two slots on the back conductor, two adjacent poles appear at central frequencies of 3.0?GHz and 3.9?GHz, respectively, and the antenna shows the ultra-wideband (UWB) characteristics. The first pole appears at the central frequency of 3.0?GHz and covers the band width of 950?MHz, and the second pole exists at a central frequency of 3.90?GHz covering a bandwidth of 750?MHz. Experimental result shows that impedance bandwidth of 129% (S11 ?dB) is well achieved when the antenna is excited with both slots. Compared to most of the previously reported ECPW structures, the impedance bandwidth of this antenna is increased and also the size of the antenna becomes smaller and more suitable for many wireless applications like PCS (1850–1990?MHz), WLAN (2.4–2.484?GHz), WiMAX (2.5–2.69?GHz and 5.15–5.85?GHz), and also X-band communication. 1. Introduction Recently, a considerable amount of researches have been devoted to the development of UWB antenna for its enabling high data transmission rates, low power consumption, and simple hardware configuration in wireless applications like radio frequency identification devices, sensor networks, radar, location tracking system, and so forth. The UWB antennas of such systems are also required for small size, nondispersive [1], and wideband properties. Its commercial applications of the frequency band from 3.1?GHz to 10.6?GHz were approved by the Federal Communications Commission (FCC) in America in 2002 [2, 3]. As a result, many new UWB antennas [4–12] have been proposed; among them, the printed monopole antennas [13–18] have received much attention due to their wideband characteristic, omni-directional radiation patterns, high radiation efficiency, and compact size. Recent technological advances and the size reduction of electronic circuits have changed the wireless communications and sensor network design specifications. In particular, they have exposed the need for electrically small antennas that are efficient and have significant bandwidths. The standard electrically small antenna designs are known to be inefficient due to the large reactance and small
A Parametric Study on Impedance Matching of A CPW Fed T-shaped UWB Antenna  [PDF]
D.Ujwala,B.Jyothi,Shaik Saira Fathima,P.Harish
International Journal of Soft Computing & Engineering , 2012,
Abstract: A CPW fed novel compact Ultra wide band antenna is proposed in this paper. The size of the antenna is 20mm x 20mm x 0.6mm and it is prototyped on FR4-Epoxy substrate material which has a dielectric constant of 4.4. The proposed antenna provides a bandwidth of 5.45 GHz from 4.76 GHz to 10.21 GHz which can be used for wireless applications. A parametric study is carried out by varying the horizontal and vertical gaps ‘g’ and ‘d’ between the conducting patch and ground. The output parameters and the dimensional variation effects on the proposed antenna are presented in this paper. Simulations are carried out using Finite Element based Ansoft High Frequency Structure Simulator.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.