2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications

21-23 March 2007

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  • [Front cover]

    Publication Year: 2007, Page(s): C1
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  • [Copyright notice]

    Publication Year: 2007, Page(s): ii
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  • General Chairs Welcome Message

    Publication Year: 2007, Page(s): iii
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  • iWAT'07 General Chairs

    Publication Year: 2007, Page(s):iv - vi
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  • iWAT 200 Sponsonrs and Exhibitors

    Publication Year: 2007, Page(s): vii
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  • Table of contents

    Publication Year: 2007, Page(s):viii - 18
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  • [Title page]

    Publication Year: 2007, Page(s): C2
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  • Modern Small Antenna Engieering

    Publication Year: 2007, Page(s):3 - 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4308 KB) | HTML iconHTML

    In this paper, small antennas (SA) are treated with a wide concept, in which not only electrically small antennas (ESA), but also SA's categorized in terms of dimensions and functions are included. Essentials of SA are discussed pertaining to the fundamentals of SA and realization of SA. Matching and resonance are taken as the significant issues in SA. Investigation of the radiation mechanism of a... View full abstract»

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  • A Critical Look at the Performance Enhancement of Small Antennas using Metamaterials

    Publication Year: 2007, Page(s):7 - 10
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2075 KB) | HTML iconHTML

    Currently, there is a great deal of interest in enhancing the performance of small antennas using metamaterials. Of course, the interest itself is not new, since the search has always been actively pursued for ways to increase the directivity, reduce the sidelobe and backlobe levels, improve the bandwidth, etc., of small antennas whose dimensions are limited by the available real estate. What is n... View full abstract»

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  • Compact Multiple Antennas in a Random World

    Publication Year: 2007, Page(s):11 - 15
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3523 KB) | HTML iconHTML

    Recent work on compact multiple antennas in a random environment is reviewed, including extensions of the energy density antenna and the MIMO cube. The performance of handsets with multiple antennas is dependent on many factors due to the close proximity of the antennas. The distribution of scatterers in the environment has an impact on the distributed directivity of the antennas, the powers absor... View full abstract»

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  • Lumped Element Capacitor Based Two-Dimensional Efficient Metamaterial-inspired Electrically-Small Antenna

    Publication Year: 2007, Page(s):19 - 22
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3755 KB) | HTML iconHTML

    Easy to build, efficient and electrically-small antenna designs are presented which are based on a two-dimensional (2D) metamaterial-inspired structure that incorporates a lumped element capacitor in its design and that is driven by an electrically-small rectangular semi-loop antenna fed by a coaxial cable through a finite PEC ground plane. Measured reflection coefficients showed a very good agree... View full abstract»

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  • Steerable ultra-thin directive antenna from a metamaterial-based subwavelength cavity

    Publication Year: 2007, Page(s):19 - 22
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3576 KB) | HTML iconHTML

    We report the design of a steerable directive antenna using a resonant metamaterial-based subwavelength cavity. The cavity is made of a conventional ground plane and a composite metamaterial acting us a partially reflective surface. The antenna is a rectangular microstrip patch designed to operate near 10 GHz. The composite metamaterial is made of a variable capacitive grid and a constant inductiv... View full abstract»

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  • Periodic Materials and Printed Structures for Miniature Antennas

    Publication Year: 2007, Page(s):23 - 26
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3388 KB) | HTML iconHTML

    Engineered materials, such as new composites, electromagnetic bandgap, and periodic structures have attracted considerable interest in recent years due to their remarkable and unique electromagnetic properties. Among this class of media are the magnetic photonic and degenerate bandgap crystals. These periodic media have the concurrent characteristics of wave slow-down and impedance matching at the... View full abstract»

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  • The Relationship Between Bandwidth and Quality Factor for Electrically Small Antennas Exhibiting Closely Spaced Resonances

    Publication Year: 2007, Page(s):27 - 30
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2610 KB) | HTML iconHTML

    Electrically small antennas typically exhibit a single resonance within their impedance bandwidth, the extents of which are defined by some choice of VSWR's. With as single resonance antenna, the inverse relationship between bandwidth and quality factor is well defined and holds over a wide range of frequencies. Additionally, both bandwidth and quality factor can be accurately approximated from th... View full abstract»

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  • Mutual coupling investigation of two wideband dipole antennas on EBG ground plane

    Publication Year: 2007, Page(s):35 - 38
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3255 KB) | HTML iconHTML

    Nowadays, using EBG as antenna ground plane is well known in the antenna community. But most applications are limited to narrowband antennas. A broadband antenna mounted on an EBG structure has been investigated recently in the University of Birmingham. It performs well over 4.8 to 6.8 GHz with return loss lower than -10 dB, gain greater than 6 dB and good radiation pattern. In this paper, this re... View full abstract»

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  • Antennas Challenges for Body Centric Communications

    Publication Year: 2007, Page(s):41 - 44
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4130 KB) | HTML iconHTML

    Communications using antennas on the body is now of interest to enable systems to be developed for a number of applications, including personal entertainment, communications and health related needs. This paper discusses some of the challenges facing designers developing antennas for these applications. For communications links on the body from different equipment, such as a mobile phone, headset ... View full abstract»

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  • Personal Antennas for Mobile Networks

    Publication Year: 2007, Page(s):45 - 48
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3002 KB) | HTML iconHTML

    The paper has demonstrated a wearable coplanar antenna integrated with an EBG surface that operates at two frequency bands of interest for network communications. The antenna has relatively low back radiation to reduce SAR values while having higher gain in directions away from the torso. View full abstract»

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  • A Wideband Study of the Bandwidth, SAR and Radiation Efficiency of Mobile Terminal Antenna Structures

    Publication Year: 2007, Page(s):49 - 52
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4894 KB) | HTML iconHTML

    In this paper, the frequency dependence of bandwidth, SAR and radiation efficiency of mobile terminal antennas are studied at wide frequency range, from 0.6 GHz to 6 GHz. Two antenna models are studied with simulations in free space and in talk-position beside a head model and two hand models. The results show a connection between chassis resonant frequencies, impedance bandwidth, SAR, and radiati... View full abstract»

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  • A multi-band, dual-antenna and antenna interface module system for mobile phones

    Publication Year: 2007, Page(s):53 - 56
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3701 KB) | HTML iconHTML

    This paper presents details of a self-diplexing dual antenna system and associated antenna interface module. The manufactured demonstrator operates efficiently in 4 GSM bands and 3 UTRA bands with antennas that are just 6 mm high. It is shown that the VSWR can be maintained below approximately 4:1 in all modes no matter how the phone containing the antennas is held View full abstract»

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  • Wlan Jacket Mounted Antenna

    Publication Year: 2007, Page(s):57 - 60
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3039 KB) | HTML iconHTML

    A novel antenna mounted on a textile jacket is presented which arises from previous research work on metal button structures for wearable antennas. The antenna has the dimensions of metallic buttons used in denim clothing. The dimensions have been reduced compared to previously reported designs and this is achieved using dielectric material between two parallel metal plates and a displaced via con... View full abstract»

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  • New Technology Millimetrewave Antennas

    Publication Year: 2007, Page(s):63 - 68
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    A combination of new fabrication technologies, improved RF modelling techniques and novel applications of EBG structures have been combined to illustrate how future highly compact millimeterwave antennas can be fabricated using silicon processing. Experimental results have confirmed that the designed antennas showed improved performances in terms of directivity and beamwidth, which could find many... View full abstract»

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  • Integrated Microwave and Millimeter Wave Antennas Based on SIW and HMSIW Technology

    Publication Year: 2007, Page(s):69 - 72
    Cited by:  Papers (13)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3122 KB) | HTML iconHTML

    In this paper, the research advances in integrated microwave and millimeter wave antennas based the substrate integrated waveguide (SIW) and half-mode substrate integrated waveguide (HMSIW) technology are reviewed, including the SIW/HMSIW slot array antennas, leakage wave antennas, omnidirectional antennas, monopulse antennas, filtennas, dielectric resonator antennas and rectennas etc. The achieve... View full abstract»

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  • Polarisation-Reconfigurable Patch Antenna

    Publication Year: 2007, Page(s):73 - 76
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3343 KB) | HTML iconHTML

    A tunable hybrid coupler was successfully designed to feed an antenna for full polarisation capabilities. The proposed solution has the advantages of separating the active devices from the radiating element and thus avoiding any unwanted coupling effects. Also, it provides a full set of polarization states by simply changing the DC bias of both a SPDT and two varactor diodes. The feasibility of th... View full abstract»

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  • Low-Profile Rolled Planar Antenna with Wide Bandwidth

    Publication Year: 2007, Page(s):77 - 80
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3579 KB) | HTML iconHTML

    A novel size-reduction technique for a planar monopole type antenna is presented. By rolling the planar element of this antenna, a low-profile radiator with broad impedance bandwidth is obtained without excessively perturbing its radiation properties. The proposed antenna is capable of covering frequencies in the range 3.1 GHz to 15 GHz. The antenna yields a high gain with high radiation efficienc... View full abstract»

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  • Compact Active Multiband Cellular Antenna for Mobile Handsets

    Publication Year: 2007, Page(s):81 - 84
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2516 KB) | HTML iconHTML

    A small active controllable cellular antenna for mobile phones has been designed and evaluated. With a switch on top of the radiator different frequency bands can be chosen. The antenna is based on a dual band IFA design but number of bands are increased to four. Two different radiator branches can be activated by the switch which results in a frequency shift. In one state the antenna covers the G... View full abstract»

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