By Topic

Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE

Date 7-13 July 2013

Filter Results

Displaying Results 1 - 25 of 1135
  • [Front cover]

    Page(s): c1
    Save to Project icon | Request Permissions | PDF file iconPDF (163 KB)  
    Freely Available from IEEE
  • [Title page]

    Page(s): i
    Save to Project icon | Request Permissions | PDF file iconPDF (184 KB)  
    Freely Available from IEEE
  • [Copyright notice]

    Page(s): ii
    Save to Project icon | Request Permissions | PDF file iconPDF (131 KB)  
    Freely Available from IEEE
  • [Breaker page]

    Page(s): iii
    Save to Project icon | Request Permissions | PDF file iconPDF (48 KB)  
    Freely Available from IEEE
  • AP-S/URSI 2013 steering committee

    Page(s): iv
    Save to Project icon | Request Permissions | PDF file iconPDF (105 KB)  
    Freely Available from IEEE
  • Technical program committee

    Page(s): v - xiv
    Save to Project icon | Request Permissions | PDF file iconPDF (140 KB)  
    Freely Available from IEEE
  • Chair's welcome message

    Page(s): xv
    Save to Project icon | Request Permissions | PDF file iconPDF (112 KB)  
    Freely Available from IEEE
  • [Breaker page]

    Page(s): xvi
    Save to Project icon | Request Permissions | PDF file iconPDF (48 KB)  
    Freely Available from IEEE
  • Table of contents

    Page(s): xvii - civ
    Save to Project icon | Request Permissions | PDF file iconPDF (356 KB)  
    Freely Available from IEEE
  • Millimeter and submillimeter planar measurement setup

    Page(s): 1 - 2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (394 KB) |  | HTML iconHTML  

    A three-axes planar measurement setup for antenna characterization and inverse scattering applications is described. The need for a new measurement facility capable of working at millimeter and sub millimeter frequency bands is the main motivation of this work. The system can be divided into two main blocks devoted to mechanical and radiofrequency control respectively. Frequency band is extended up to 330 GHz by means of mixing heads, and a working surface of 1450×1500×1100 mm, with 0.01 mm positioning accuracy is achieved. Measurement setup is provided with an easy-to-use graphical user interface allowing configuration of mechanical and radiofrequency devices, as well as graphical representation of the results and post processing tasks. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ultra Wide Band CPW-fed circularly polarized square slot antenna

    Page(s): 3 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (255 KB)  

    A novel design is described for UWB- circularly polarized square slot antenna (CPSSA). Circular polarization (CP) operations can be attained using a fork-shaped feed line protruded from the feeding coplanar waveguide (CPW). The CP bandwidth can be significantly enhanced by implanting a pair of inverted-L, and inverted-F grounded strips into three corners of the slot and truncate remained corner. The designed antenna exhibits an impedance bandwidth of 10GHz. Multi regions exhibits CP with FBW that varies from 5% to 40%. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ultra broadband millimeter-wave antenna fabricated on flexible substrate

    Page(s): 5 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5704 KB) |  | HTML iconHTML  

    This paper investigates an ultra broadband planar antenna which is appilcable in D-band systems. The proposed design allows the fabrication of the antenna on a 25μm thin flexible polyimide based substrate which is machined by standard thick film processes. The relative bandwidth of the antenna is about 36 %, a high gain from 7 to 11 dB is achieved in the frequency range from 110 - 170 GHz. The constant broadside radiation patterns are presented by measurement results and are finally compared to the simulation. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A reconfigurable circularly polarized embedded PICA

    Page(s): 7 - 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (297 KB) |  | HTML iconHTML  

    In this paper, a circularly polarized reconfigurable planar inverted cone antenna (PICA) is designed, fabricated and tested. Generally, PICA antenna shows wider-bandwidth and linear polarization characteristics. However, in order to generate circular polarization, asymmetrical types of two unbalanced circular slots are etched on PICA at angle of 45°. Parametric study is done to determine the optimal dimensions of the slots. The varactor diodes (SMV1232-079LF) are placed on both sides of the PICA to enable the tenability aspects of the antenna. The measurement results show 10dB impedance bandwidth from 2GHz-9GHz at 0V. However, when the diode voltage varies from 1V to 12V, the 10dB impedance bandwidth reduces to 2GHz-4.5GHz. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dual-polarization cylindrical long slot array (CLSA) antenna integrated with compact broadband baluns and slot impedance transformers

    Page(s): 9 - 10
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (6594 KB) |  | HTML iconHTML  

    In this paper a realistic method for feeding the dipole mode of the dual-polarized CLSA antenna is presented. A compact lumped-element impedance transforming balun is designed, fabricated, and tested with a broadband dipole. The broadband balun is then simulated to verify its performance in the dual-polarized CLSA antenna along with the slot impedance transformers. This antenna has the capability of achieving 4 polarization modes (vertical, horizontal, LHCP, RHCP). View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A compact microstrip ultra-wideband (UWB) antenna for VHF/UHF band applications

    Page(s): 11 - 12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (335 KB) |  | HTML iconHTML  

    A compact ultra-wideband quasi log-periodic dipole antenna (LPDA) printed on dielectric substrate is proposed in this paper. The antenna is realized by cascading straight line LPDA with 29 elements and meander line LPDA with 11 elements. An ultra-wideband of 20-2200 MHz was obtained, and the antenna gain was about 6 dBi in the band of 100-2200 MHz. The simulation results indicate that the designed UWB LPDA has very stable radiation patterns throughout the whole frequency band combined with low profile and ease fabrication, which show great potential for VHF and UHF bands wireless communications. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A miniaturized ultrawideband monocone antenna by using intelligent dielectric loading

    Page(s): 13 - 14
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (590 KB) |  | HTML iconHTML  

    We propose a miniaturized ultrawideband monocone antenna. The size reduction was achieved by loading a dielectric material of high dielectric constant around the antenna in an intelligent manner. In order to maintain the impedance bandwidth characteristics, a spatial quarter wave transformer was applied. A preliminary antenna was fabricated and tested, and the measured results have shown good agreement with the simulated data. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fractal quasi-self complimentary miniaturized UWB antenna

    Page(s): 15 - 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (241 KB)  

    A miniature Ultra-wideband (UWB) quasi self-complementary antenna with Koch fractal boundary for ultra-wideband is presented. The proposed antenna has a total size of 16 mm × 13 mm × 1.5 mm that enables embedding in various portable devices with wide impedance bandwidth covering the range from 3.3-13.5 GHz with return loss better than -10dB. It also exhibits a much-reduced ground plane effect compared to the stand-alone design. Omnidirectional radiation patterns with appreciable gain across the operating band can be obtained. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Energy Patterns of UWB antenna arrays with low side lobe level during beam-scanning

    Page(s): 17 - 18
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB) |  | HTML iconHTML  

    A synthesis of energy patterns for UWB antenna arrays is presented in this paper. This synthesis regards the optimization of the positions of the antenna elements in a linear geometry. The well-known method of Differential Evolution (DE) is utilized for this optimization problem. A single Vivaldi antenna is simulated by using the commercially available CST Microwave Studio software. The electric field for the array is determined in according to the superposition principle. Simulation results for the optimized non-uniform array are provided. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Effect of Base Station configurations and complexity on the accuracy of ultra wideband localisation

    Page(s): 19 - 20
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (177 KB) |  | HTML iconHTML  

    This paper presents experimental work on 3D localisation using different Base station configurations. The two Base Station (BS) configurations proposed (L shape and Mirror Based) use only 3 BS's and are able to achieve good accuracy in cm range in 3D. Time of Arrival and peak detection algorithms are used to find the position of the target. Results show that the configuration of base stations directly affect localization accuracy. It is observed that the average localization accuracy of the L shape configuration is in the range of 3-5 cm and for mirror based configuration is around 2 cm for x and y axis and 5 cm for z axis. Average Directional accuracy achieved is approx 1 to 3 degrees for both azimuth and elevation angles. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Planar dual-polarized UWB antenna with common aperture and high isolation

    Page(s): 21 - 22
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (278 KB) |  | HTML iconHTML  

    A dual-polarized circular slot antenna for UWB (3.1-10.6 GHz) applications was proposed in this paper. The antenna was fed by a slot and a monopole to generate two polarizations which were achieved by the orthogonal fields on the same circular slot. Due to different feeding mechanisms which are magnetic and electric current excitations, respectively, good isolation between two input ports (> 25 dB) was achieved through the whole band. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Identification of an object located on the ground using its natural poles using both FD and TD data

    Page(s): 23 - 24
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (244 KB) |  | HTML iconHTML  

    A methodology for identification of an object located on the ground using its natural resonant frequencies from both time and frequency domain data is presented. This methodology is then applied to generate a library of poles of various perfectly conducting objects (PEC) using the Cauchy method in the frequency domain and compare them with the computed natural poles of an unknown object on the ground using the typical transient temporal late time response using the Matrix Pencil (MP) method in the time domain. By comparing both of them, one can identify the unknown object on the ground. For identification of an object on the ground, one transmitter and two receivers are utilized and each of the antennas is considered to be a dipole antenna. Simulation example is analyzed to illustrate the potential of this proposed methodology. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Time-domain asymptotic solutions of transient scattered field excited by a thin cylindrically curved conducting surface with edges

    Page(s): 25 - 26
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (214 KB) |  | HTML iconHTML  

    By applying the Fourier transform method, we derive the time-domain asymptotic solutions for the transient scattered field including the edge diffracted ray (ED), the edge diffracted and reflected ray (EDR), the whispering-gallery mode radiation (WG), and the edge-surface diffracted ray (SD) which are excited when a plane pulse wave is incident on a thin cylindrically curved conducting surface with edges. The validity of the asymptotic solutions derived here is confirmed by comparing with the reference solution calculated numerically. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On spurious resonant modes in the MOT solution of time domain EFIE

    Page(s): 27 - 28
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (588 KB) |  | HTML iconHTML  

    Theoretically, internal resonant modes should not be induced in the marching-on-in-time (MOT) solution of the time domain electric field integral equation since zero initial conditions are enforced at the beginning of time marching and the internal resonant modes do not satisfy these initial conditions. However, these spurious modes are always observed in the MOT solution. It has been conjectured in the past that numerical errors might establish the necessary initial conditions and allow the incident field to induce the internal resonant modes. Systematic numerical experiments carried out in this work prove this conjecture by demonstrating that the internal resonant modes' amplitudes are indeed dictated by the numerical errors and the spectrum of the incident field. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A study of the numerical accuracy between the matrix elements for a Marching-on-in-degree time domain and a frequency domain MoM

    Page(s): 29 - 30
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (180 KB) |  | HTML iconHTML  

    In a Marching-on-in-degree time domain solver based on a Galerkin implementation of the Method of Moments (MoM), it is observed that the matrix elements for the matrix to be inverted contain integrals that are similar to the ones encountered in a frequency domain MoM solver using the piecewise triangular patch basis functions. It is also observed that the error in the evaluation of the matrix elements involving these integrals are larger in the time domain than those involved in the frequency domain MoM solvers. The objective of this paper is to explain this dichotomy and how to improve upon them when using the triangular patch basis functions (RWG) for both the time and the frequency domain techniques. When the distance between the two triangular patches involved in the evaluation of the matrix elements, are close to each other or when the degree of the Laguerre polynomial in a MOD method is high, the integral accuracy will be compromised and the number of sampling points to evaluate the integrals need to be increased. Numerical results are presented to illustrate this point. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Accurate characterization of 3D diffraction gratings using time domain discontinuous Galerkin method with exact absorbing boundary conditions

    Page(s): 31 - 32
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (264 KB) |  | HTML iconHTML  

    Exact absorbing and periodic boundary conditions allow to truncate grating problems' infinite physical domains without introducing any errors. This work presents exact absorbing boundary conditions for 3D diffraction gratings and describes their discretization within a high-order time-domain discontinuous Galerkin finite element method (TD-DG-FEM). The error introduced by the boundary condition discretization matches that of the TD-DG-FEM; this results in an optimal solver in terms of accuracy and computation time. Numerical results demonstrate the superiority of this solver over TD-DG-FEM with perfectly matched layers (PML)-based domain truncation. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.