Planar antennas

Dublin Institute of Technology, Dublin, Leinster, Ireland
IEEE Microwave Magazine (Impact Factor: 1.13). 01/2007; 7(6):63 - 73. DOI: 10.1109/MW-M.2006.250315
Source: IEEE Xplore


This article reviews the state of the art in broadband antennas for emerging UWB applications and addresses the important issues of the broadband antenna design for UWB applications. First, a variety of planar monopoles with finite ground planes are reviewed. Next, the roll antennas with enhanced radiation performance are outlined. After that, the planar antennas printed on PCBs are described. A directional antipodal Vivaldi antenna is also presented for UWB applications. Last, a UWB antenna for wearable applications is exemplified

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Available from: Zhi Ning Chen, Mar 16, 2013
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    • ". This has increased the demands on the UWB systems and subsequently to stimulate the research activities in various UWB antenna designs [2], [3]. Moreover, dual-polarized UWB antennas are more attractive compared with linearly polarized antennas, as the channel capacity is significantly enhanced due to the polarization diversity technique. "
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    ABSTRACT: A novel dual-polarized patch antenna for ultra-wideband (UWB) applications is presented. The antenna consists of a square patch and four capacitively coupled feeds to enhance the impedance bandwidth. Each feed is formed by a vertical isosceles trapezoidal patch and a horizontal isosceles triangular patch. The four feeds are connected to the microstrip lines that are printed on the bottom layer of the grounded FR4 substrate. Two tapered baluns are utilized to excite the antenna to achieve high isolation between the ports and reduce the cross-polarization levels. In order to increase the antenna gain and reduce the backward radiation, a compact surface mounted cavity is integrated with the antenna. The antenna prototype has achieved an impedance bandwidth of 112% at $(vert {rm S}_{11} vert leq -10~{rm dB})$ whereas the coupling between the two ports is below $-28~{rm dB}$ across the operating frequency range. The measured antenna gain varies from 3.91 to 10.2 dBi for port 1 and from 3.38 to 9.21 dBi for port 2, with a 3-dB gain bandwidth of 107%.
    Full-text · Article · May 2014 · IEEE Transactions on Antennas and Propagation
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    • "LTRAWIDEBAND (UWB) applications have been attracting tremendous interests. Compact-size planar antennas have played key roles in achieving optimal performance in portable and mobile applications [1], [2]. Among them, various coplanar waveguide (CPW)-fed monopoles with differently shaped radiators are drawing more and more attention due to their unique characteristics of compact structure, omnidirectional radiation pattern, and compatibility with the printed circuit board (PCB) technique. "
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    ABSTRACT: In this letter, a compact coplanar-waveguide-fed single-layer printed antenna with an ultrawideband (UWB) rectangular monopole radiator etched with a half-elliptical slot is presented. Collaborating with the UWB radiator, two symmetrical open-circuit stubs are extended from the ground plane to jointly achieve an ultrawideband impedance match with a compact size. The proposed antenna is fabricated and tested in an anechoic chamber, showing an ultrawide operating frequency range from 3.7 to 10.1 GHz with a quasi-omnidirectional gain from 2.0 to 7.3 dBi. With the advantages of a reduced size, an improved voltage standing wave ratio (VSWR), and a monolayer configuration without any back ground plane, the proposed antenna can be used in a wide range of UWB applications.
    Full-text · Article · Jan 2013 · IEEE Antennas and Wireless Propagation Letters
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    • "Antennas with very wide impedance bandwidth and stable radiations are required for such systems. Among many UWB antennas, planar types are low profile, light weight, low cost and suitable for mobile devices [1]. However, the planar antennas may not radiate omni-directionally at all operating frequencies because they generally have wide structures and are not rotationally symmetrical. "
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    ABSTRACT: A compact antenna is proposed for operating at the Federal Communications Commission allocated ultra-wideband (UWB) of 3.1-10.6 GHz. The antenna is made by deforming a film antenna which consists of two glass-shaped and square-shaped radiation elements. The antenna in its planar form is optimized for the UWB operation and is deformed by different manners such as folding, meandering or twisting, without much influence on its input characteristics. The deformations not only miniaturize the antenna but also improve its radiation characteristics. A prototype with a dimension of 20 x 33 mm(2) is fabricated and then the antenna is deformed by rolling it into a circular rod with a diameter of 6.4 mm, or meandering it into a square rod with a cross-sectional dimension of 6 x 5 mm(2). The deformed antennas maintain the operation at the UWB and have better omni-directional radiation patterns than the antenna in its planar form.
    Full-text · Article · Oct 2010 · IEICE Transactions on Communications
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