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Antennas and Propagation (EuCAP), 2010 Proceedings of the Fourth European Conference on

Date 12-16 April 2010

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Displaying Results 1 - 25 of 1001
  • [Front cover]

    Publication Year: 2010 , Page(s): c1
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  • [Copyright notice]

    Publication Year: 2010 , Page(s): 1
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    Freely Available from IEEE
  • Table of contents

    Publication Year: 2010 , Page(s): 1 - 33
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  • Wideband, balanced-fed 60 GHz antennas for integrated transceivers on LTCC substrate

    Publication Year: 2010 , Page(s): 1 - 5
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (740 KB) |  | HTML iconHTML  

    This paper presents novel antennas on DuPont 943 LTCC substrate with a balanced feed, designed to operate in the 60 GHz frequency range, foreseen for future high data rate WLAN systems and broadband multimedia applications. These antennas display not only good matching and radiation properties, but also the use of LTCC material allows for a high degree of integration with different RF circuits. View full abstract»

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  • Urban measurements and propagation models comparison of a 3.5 GHz signal for broadband wireless systems

    Publication Year: 2010 , Page(s): 1 - 5
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (280 KB) |  | HTML iconHTML  

    This paper presents the results of propagation measurements taken at 3.5 GHz in Rio de Janeiro city. An urban environment was chosen to collect data. The results presented in this paper deal with path loss measurement for coverage prediction and the study of received signal variability essential for determining system parameters. The results are compared with the most popular empirical and statistical models in the literature. This work offers propagation measurements in a frequency range that is globally being allocated for broadband wireless systems. View full abstract»

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  • Miniaturised Frequency Selective Surface

    Publication Year: 2010 , Page(s): 1 - 4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (849 KB) |  | HTML iconHTML  

    This paper presents a method for designing a Frequency Selective Surface (FSS) using a miniaturised unit cell based on a simple lumped circuit analogue. The paper presents the theory underpinning the technique with a single polarisation method, followed by a dual polarised design. This manufactured FSS has a unit cell size of λ/15 and a measured −3dB bandwidth of 60%, operating at 3GHz. The paper shows how an FSS with a unit cell size of λ/22 can be achieved, operating around 500MHz. The paper shows full field simulations of the structures. View full abstract»

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  • X-Band acquisition aid antenna for ground stations application

    Publication Year: 2010 , Page(s): 1 - 5
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (401 KB) |  | HTML iconHTML  

    This paper describes the design and operational validation of the X-Band acquisition aid system (XAA) installed and used in the ESTRACK LEOP network. The purpose of this acquisition aid antenna is to provide a wider X-band beam than the 15m main antenna during the first critical acquisition phase after orbit injection. The paper describes the design and performances of the most important components as well as of the complete antenna. An XAA prototype was manufactured and installed within the ESA ground station in Perth, Western Australia. Operational validation of the system has been successfully achieved in the frame of the Herschel-Plank LEOP campaign in May 2009. A second XAA antenna was installed in 2009 in Kourou (French Guyana) and a third one will be deployed in Maspalomas (Canary Islands) in 2010. These three terminals will provide the core support to the Lisa Pathfinder LEOP. View full abstract»

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  • Antenna polarization mismatch in body area network communications

    Publication Year: 2010 , Page(s): 1 - 4
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (280 KB) |  | HTML iconHTML  

    In any wireless communications, antennas and propagation are key concerns. Their importance becomes more significant for in-body and on-body wireless medical applications. In/on-body devices are of great interest for wireless medical applications due to the promising of different clinical usage to promote a patient independence. In medical wireless applications, antenna should be part of device and it should be placed inside or on surface of body tissue. Therefore, due to presents of body tissues, there is strong effect on antenna characteristics and as a result on propagation, which will be different for individuals. However the mass production could not be for individuals and there should be a range of accepted propagation related factor. This paper discusses on polarization mismatch due to body movements between in/on-body antennas and receiving antenna with some certain distance from body. View full abstract»

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  • Internal planar loop/monopole combo antenna for eight-band LTE/GSM/UMTS operation in the laptop computer

    Publication Year: 2010 , Page(s): 1 - 4
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (679 KB) |  | HTML iconHTML  

    An internal laptop computer antenna capable of generating two wide operating bands to respectively cover the LTE700/GSM850/900 (698~960 MHz) and GSM1800/1900/ UMTS/LTE2300/2500 (1710~2690 MHz) operation is presented. The antenna occupies a size of 85 × 10 × 4 mm3 along the top edge of the supporting metal frame of the display panel and is suitable to be embedded inside the casing of the laptop computer. The antenna is a printed loop/monopole combo antenna formed by combining a quarter-wavelength printed loop with an internal matching circuit and a printed monopole with an internal distributed inductor. The proposed combo antenna leads to reduced size yet wide bandwidth to cover the eight-band LTE/GSM/UMTS operation. View full abstract»

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  • Differential phase shift characteristics of normal TE0n modes in an azimuthally magnetized coaxial ferrite waveguide

    Publication Year: 2010 , Page(s): 1 - 5
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (278 KB) |  | HTML iconHTML  

    The method of successive approximations is applied to reckon the differential phase shift characteristics of the coaxial waveguide, completely filled with azimuthally magnetized ferrite, for normal TE0n modes. It uses the positive purely imaginary roots of the characteristic equation of configuration, derived by complex confluent hypergeometric functions, to compute the guide radius and phase constant of the waves in normalized form at a selected value of the off-diagonal ferrite permeability tensor element. The roots are determined for a fixed central conductor to waveguide radius ratio and varying imaginary part of the first complex parameter of wave functions. The procedure goes on, until the counted numerical equivalent of the radius coincides with a chosen one of the same with a prescribed accuracy. The relevant value of the phase constant is accepted as the one, searched for. Calculations are performed for both signs of the imaginary part (of the magnetization), yielding the phase shift. The boundaries of the area in which the latter is produced, are traced, as well. An analysis is made of the impact of the parameters of the structure on the graphically presented normalized characteristics in case of TE01 mode. View full abstract»

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  • Rapid surrogate-based optimization of UWB planar antennas

    Publication Year: 2010 , Page(s): 1 - 4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (214 KB) |  | HTML iconHTML  

    Computationally efficient design optimization methodology for ultra-wideband (UWB) antennas is proposed. Our technique exploits space mapping with the underlying surrogate model built using kriging interpolation of the coarse-discretization EM simulation data. Robustness of the proposed approach is demonstrated through the design of two UWB planar antennas. In both cases, an optimized design is obtained at the computational cost corresponding to a few full-wave EM simulations of the antenna structures under consideration. View full abstract»

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  • Analysis of a reconfigurable reflectarray cell comprising a multitude of MEMS control elements

    Publication Year: 2010 , Page(s): 1 - 4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (269 KB) |  | HTML iconHTML  

    This paper discusses the analysis of reflectarray cells comprising MEMS control elements. The method employed allows a very fast and accurate analysis of the reflectarray cell performance, quasi independently of the number of embedded MEMS and reconfigurable states. It also allows computing useful design parameters such as the power dissipated in each MEMS within the cell. Based on this method, we present the analysis of a monolayer cell embedding a multitude of MEMS control elements, demonstrating for e.g. the intimate link between phase dispersion and loss in such reconfigurable reflecting cells. View full abstract»

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  • The SHARK antenna : A miniature antenna for transient Ultra Wide Band applications in the frequency band 800MHz–8GHz

    Publication Year: 2010 , Page(s): 1 - 3
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1034 KB) |  | HTML iconHTML  

    This paper is dedicated to an original miniature antenna for transient Ultra Wide Band applications : the Shark antenna. This antenna is well matched from 800MHz up to 8GHz, has a sectoral transient radiation pattern, has a high transient front to back ratio, and is dedicated to be used in an array with an N generators / N antennas architecture. This paper presents the design and the characteristics of this antenna. View full abstract»

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  • Intracranial pulsation detected by ultra-wideband radar: Detectability analysis using synthetic signals

    Publication Year: 2010 , Page(s): 1 - 3
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (317 KB) |  | HTML iconHTML  

    We have already established a combined magnetic resonance (MRI) / ultra-wideband radar (UWB) prototype demonstrating the absence of any mutual interference between both systems, proving the feasibility of the UWB radar method to monitor respiratory and myocardial displacements in a 3 T scanner. In a further study we have shown the feasibility of UWB radar to detect involuntary head motions in the sub-mm range, demonstrating the feasibility of interfacing a MR scanner with an external UWB radar based motion tracking system. It is well known that simultaneous intracranial oscillation also occur, induced by respiration and myocardial contraction. Hence, it is only consequent to ask whether these oscillations are detectable by UWB radar. View full abstract»

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  • Investigation of novel microstrip antennas for an implantable retinal prosthesis

    Publication Year: 2010 , Page(s): 1 - 4
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (366 KB) |  | HTML iconHTML  

    In this paper, we investigate compact microstrip antennas as a data-telemetry transmitting and implantable receiving antenna in a dual-unit retinal prosthesis. Compact triangular microstrip antenna is explored in an effort to enhance intraocular element bandwidth at microwave frequency 2.45 GHz. The performance of intraocular and extraocular antennas were simulated and further examined by fabricating and characterizing the performance in a transmit/receive system inside eye phantoms. Detailed analysis of the design issues of the antennas, results of the simulation and experimental coupling measurements are presented. View full abstract»

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  • Design and characterization of a planar Artificial Magnetic Conductor in the RFID SHF band

    Publication Year: 2010 , Page(s): 1 - 5
    Cited by:  Papers (7)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (717 KB) |  | HTML iconHTML  

    A novel design of planar Artificial Magnetic Conductor (AMC) for frequencies in the SHF RFID band is presented. The designed AMC is based on a Frequency Selective Surface (FSS) and shows polarization angle independency. Its angular margin when operating under oblique incidence is also tested. Design parameters are discussed with the support of FEM simulations and measurements in anechoic chamber of the manufactured prototype, with a good agreement between simulations and measurements. View full abstract»

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  • Improved estimation of the K-factor for Rician channels emulation in a reverberation chamber

    Publication Year: 2010 , Page(s): 1 - 5
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (211 KB) |  | HTML iconHTML  

    In many radio propagation environments, the timevarying envelope of the received signal can be statistically described by a Rician distribution. Recently, reverberation chambers have been proposed to simulate Rician radio environments with controllable K-factor. However, evaluation of Rician K-factor out of RC measurements must be analyzed very carefully. The paper provides an analytical formulation of both the estimation of K and the confidence interval associated with its estimation. View full abstract»

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  • Contrast agent based tumour detection by ultra-wideband radar: A model approach

    Publication Year: 2010 , Page(s): 1 - 3
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (569 KB) |  | HTML iconHTML  

    For the detection of tumours the application of a contrast agent to visualize the vascularization dynamic is common praxis in numerous imaging modalities, e.g. MRI or biomedical optics. Due to the high vascularization of several types of tumours, its contrast agent concentration exceeds the concentration in neighbouring tissue. Thus, the dielectric properties of the contrast agent will influence the tumour's dielectric properties and therefore the object's reflection coefficient. Furthermore, the vascularization dynamic lies in the time range of minutes. All this encourages us to pursue the detection of tumours by UWB radar, utilizing the change in dielectric properties of the tumour over time by injection of an appropriate contrast agent into the vascular system. View full abstract»

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  • New dipole slot antenna design for RFID communications

    Publication Year: 2010 , Page(s): 1 - 4
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (557 KB) |  | HTML iconHTML  

    New design of a dipole antenna with H-shaped slot at two operating bands for Radio Frequency Identification (RFID) is presented. By using an H-shaped slot over a rectangular patch at the middle associated with four T-shaped slot, the proposed antenna has a wide and dual measured return loss bandwidth. Besides, the omnidirectional radiation pattern of the antenna cover the entire frequency range including Ultra High Frequency (UHF, 915MHz) and microwaves (2.45GHz) bands has been obtained. Tuning techniques of the design parameters are proposed, and tag performance in both frequency bands is evaluated numerically an experimentally in detail. View full abstract»

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  • Small size microstrip slot antennas for ultra-wideband communications

    Publication Year: 2010 , Page(s): 1 - 5
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (482 KB) |  | HTML iconHTML  

    The design and analysis of novel printed slot antenna, fed by microstrip line, for Ultra Wide Band (UWB) communication systems is presented. Detailed simulation and experimental investigations are conducted to understand its behaviour and optimize for UWB operation. The designed antenna has a wide operating bandwidth of over 126% (2.4–10.6 GHz) for −10dB return loss. In addition to being small in size, the antenna presents stable far-field radiation characteristics in the entire operating bandwidth, relatively high gain. A parametric study has been carried out to understand the effects of various dimensional parameters and to optimize the performance of the designed antenna. View full abstract»

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  • Effectiveness of a fading emulator in evaluating the performance of MIMO systems by comparison with a propagation test

    Publication Year: 2010 , Page(s): 1 - 5
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (341 KB) |  | HTML iconHTML  

    This paper presents a MIMO spatial fading emulator, used to represent a street microcell environment. The fading emulator can reproduce a multipath radio propagation environment with either a uniform or non-uniform angular power spectrum (APS) in the horizontal plane. In this paper, we used the emulator to measure the 2-by-2 MIMO characteristics of four handset arrays with two monopoles in a multipath environment with one spatial cluster of incoming waves. From our investigation, good agreement was obtained between the results from the emulator and data measured in a radio propagation test in a street microcell. This demonstrates that the emulator is effective in evaluating the MIMO performance in a multipath propagation environment. View full abstract»

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  • An ultra-wideband printed monopole antenna with the gain enhanced using a surface-mounted short horn

    Publication Year: 2010 , Page(s): 1 - 4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (561 KB) |  | HTML iconHTML  

    An ultra-wideband printed monopole antenna, improved by attaching a short two-plate horn to its surface, is reported in this paper. The short horn, which has a slant length of 45 mm and a total physical height of 46.9 mm, significantly increases the gain of the printed monopole antenna at lower frequencies where the gain of the monopole is otherwise low, giving an almost flat gain over a 114 % bandwidth. The new antenna has a measured gain in the range of 4.8 dBi ± 0.7 dB from 3 GHz to 12 GHz. Due to its compact configuration, ease of fabrication, high gain, broad azimuth pattern and minimal ringing of a radiated pulse, it is suitable for UWB applications. View full abstract»

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  • Foliage penetration up to millimeterwave frequencies

    Publication Year: 2010 , Page(s): 1 - 3
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2535 KB) |  | HTML iconHTML  

    Within a project for forest fire observation investigations upon the transmission of foliage at millimeterwave frequencies were conducted. Attenuations in dependence of frequency and state of foliage were measured during long term experiments covering all relevant stages of foliage development. In addition results of radiometric measurements on open fire through vegetation are discussed. View full abstract»

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  • Concurrent 2.4/5-GHz multi-loop MIMO antennas with wide 3-dB beamwidth radiation for access-point applications

    Publication Year: 2010 , Page(s): 1 - 5
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1060 KB) |  | HTML iconHTML  

    A high-gain, wide-beamwidth, six-loop-antenna MIMO system suited for wireless access points in the concurrent WLAN 2.4 and 5 GHz bands is presented. The antenna system mainly comprises an antenna ground plane and single-band loop antennas, among which the three antennas are designated for 2.4 and 5 GHz operation respectively. The antennas are set in a sequential, rotating arrangement on the ground plane with an equal inclination angle of 60° to form a symmetrical structure, and the 2.4 and 5 GHz loops are facing each other one by one. The experimental results show that good port isolation can be obtained between antenna ports. High-gain, directional radiation patterns with wide 3-dB beamwidth in elevation planes are also observed. Details of a design prototype are described and discussed in the paper. View full abstract»

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  • Near region field of antennas in piecewise-homogeneous media

    Publication Year: 2010 , Page(s): 1 - 5
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (326 KB) |  | HTML iconHTML  

    The mutual effect of electric dipoles located in the near region of each other is considered. The problem is solved with due account of that the space is a heterogeneous medium with an equivalent permittivity. Calculations are based on the theory of folded dipoles. It is shown that by means of a compensation method one can produce a weak field in a given area and diminish a user's irradiation. The calculation and experimental results are presented and validate the high efficiency of the compensation method. View full abstract»

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