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Antennas and Propagation in Wireless Communications (APWC), 2013 IEEE-APS Topical Conference on

Date 9-13 Sept. 2013

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Displaying Results 1 - 25 of 86
  • [Front cover]

    Publication Year: 2013 , Page(s): 1
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  • [Copyright notice]

    Publication Year: 2013 , Page(s): 1
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  • ICEAA — IEEE APWC — EMS committees

    Publication Year: 2013 , Page(s): 1 - 2
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  • Final program

    Publication Year: 2013 , Page(s): 1 - 84
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  • Winner of the ICEAA - IEEE APWC - EMS 2013 Young Scientist Award

    Publication Year: 2013 , Page(s): 1
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  • Call for papers

    Publication Year: 2013 , Page(s): 1
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  • Table of contents

    Publication Year: 2013 , Page(s): 1 - 5
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  • List of reviewers

    Publication Year: 2013 , Page(s): 1
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  • Study on the appropriate dimensions and position of slots and notches in the ground plane of planar monopole handset antenna for bandwidth enhancement

    Publication Year: 2013 , Page(s): 2 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1853 KB) |  | HTML iconHTML  

    A slotted ground plane structure combined with a multiband planar monopole handset antenna for bandwidth enhancement and resonant modes tuning is presented. By simply inserting intelligent modifications using slots and notches to the system ground plane of an internal multiband handset antenna, a significant improvement in the bandwidths of lower bands LTE 700/GSM 850/GSM 900 and upper bands GSM 1800/1900, UMTS, LTE 2300/2500, WiMAX 3500, WLAN 2400/5200/5800 is achieved. The influences of the proposed slots and notches with different positions and dimensions on antenna performance are analyzed by means of simulations and parametric studies. Results show that the proposed ground plane modifications have improved the handset antenna performance to cover 12-band standard operations successfully. View full abstract»

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  • Compact 2.4GHz-band diversity antenna for mobile terminals

    Publication Year: 2013 , Page(s): 38 - 41
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1135 KB) |  | HTML iconHTML  

    A compact diversity antenna adopting 3-D structures for mobile terminals is proposed and studied. The antenna consists of two asymmetric quasi-dipole elements, which are printed on the upper-board, and two side-boards. It has a -10 dB impedance bandwidth of 250 MHz (2.37-2.62 GHz), covering the 2.4GHz WLAN (2400-2483 MHz) and across the whole operating frequency band, the mutual coupling between the two elements is below -17dB. The evaluation of the diversity performance is also conducted by calculating the envelope correlation coefficient and the mean effective gains using the measured radiation pattern data. View full abstract»

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  • Metahelical antenna using a left-handed property

    Publication Year: 2013 , Page(s): 74 - 77
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (297 KB) |  | HTML iconHTML  

    A dual-band metahelical antenna that has a negative phase constant for the current on the helical arm is realized. A left-handed circularly polarized (CP) wave is obtained within a specific frequency band and a right-handed CP wave is obtained within a different frequency band. The antenna characteristics, including the radiation pattern, gain, and input performance (VSWR) are presented and discussed. View full abstract»

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  • Characteristics of a dipole antenna on a capacitance grid type AMC substrate

    Publication Year: 2013 , Page(s): 86 - 89
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (957 KB) |  | HTML iconHTML  

    This paper provides simulated results of the impedance characteristics and the radiation patterns of dipole antennas on AMC substrates with different design parameters and different substrate size. View full abstract»

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  • Liquida-Sky — A tunable liquid crystal filter for space applications

    Publication Year: 2013 , Page(s): 90 - 93
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1436 KB) |  | HTML iconHTML  

    This paper describes the development of a liquid crystal (LC) controlled waveguide filter demonstrator for space application. The filter can be used in a satellite input multiplexer section (IMUX) and allows shifting the filter frequency from 19.7...20.2 GHz with 200 MHz bandwidth. The filter frequency can be controlled magnetically or electrically. The electrical field is generated by dedicated LTCC electrodes. View full abstract»

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  • Low-cost design of SIW cavity antennas using surrogate-based optimization

    Publication Year: 2013 , Page(s): 155 - 158
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (325 KB) |  | HTML iconHTML  

    A methodology for low-cost simulation-driven design of a substrate integrated waveguide (SIW) cavity antennas is presented. Our approach exploits variable-fidelity electromagnetic (EM) models of the antenna structure of interest, response surface approximations and frequency scaling. Coarse-discretization EM simulation data is used as a low-fidelity model, which - upon optimization - provides a reasonable approximation of the optimum design. The design is further refined by means of suitably corrected response surface model constructed again from coarse-discretization simulation data. The entire design process requires just a few evaluations of the original, high-fidelity EM antenna model. Our considerations are illustrated using a specific example of a SIW cavity antenna with total design cost corresponding to about 6 evaluations of the high-fidelity model. View full abstract»

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  • Active receiving antennas for direction finding

    Publication Year: 2013 , Page(s): 192 - 195
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (455 KB)  

    This paper presents the design and implementation of two VHF (30-90 MHz) receiving antennas for direction finding applications. The antennas are constrained to an aperture area of about 15 cm × 15 cm Therefore, an electrically small-loop and dipole antenna elements are considered. Active amplification designs are also proposed to improve the received signal strength. Finally, measurements are conducted to validate the performance of the designs. The measured results also show a good agreement to the simulation results. View full abstract»

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  • Modelling of the land mobile satellite communications channel

    Publication Year: 2013 , Page(s): 199 - 202
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (971 KB) |  | HTML iconHTML  

    This paper gives an overview over the essential physical phenomena of the satellite communications channel, with particular emphasis on the land mobile satellite (LMS) channel. Then it describes measurement and modelling techniques for the LMS channel and gives an overview over this field. The characteristics of the LMS channel are discussed, and “historic” DLR channel measurements are reviewed. From this, a narrowband channel model is derived, and parameters of the channel model, resulting from measurements, are presented. Finally, the paper reviews a wideband LMS model based on a tapped delay line. View full abstract»

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  • Low-profile tracking antenna for Ka-band satellite communications

    Publication Year: 2013 , Page(s): 207 - 210
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (786 KB) |  | HTML iconHTML  

    This paper provides information about a mobile low-profile satellite tracking antenna with dual-band performance and a reconfigurable circularly polarised radiation pattern, realised by Ka-band sub-aperture panels located on a mechanical azimuth positioner. The design and measurement results of a leaky-wave antenna panel, selected for this purpose, as well as a tracking antenna prototype are presented in this publication. View full abstract»

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  • A tapered long slot antenna of conical radiation beam based on substrate integrated waveguide

    Publication Year: 2013 , Page(s): 254 - 257
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1136 KB) |  | HTML iconHTML  

    In this paper, a long slot antenna of conical radiation beam is presented, which is based on the substrate integrated waveguide (SIW). The antenna consists of a pair of tapered long slots etched out of both the top and bottom broad walls of a substrate integrated waveguide to produce the conical radiation beam. Experiment results of the fabricated antenna show that the realized beam-pointing angle is 55.2° and its maximum realized gain is 12 dB with a ripple of 3.5 dB in the E-plane at the operating frequency of 15 GHz. The 10 dB return loss bandwidth is 29.3%, from 13.6 GHz to 18 GHz. View full abstract»

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  • A wire antenna for broadband WLAN applications

    Publication Year: 2013 , Page(s): 258 - 261
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (576 KB) |  | HTML iconHTML  

    This paper presents a wire antenna for multi-band WLAN application, designed using the Structure-Based Evolutionary Programming, and having a very simple geometry. The antenna has been analysed with NEC-2 during the evolutionary process, and the outcome of the procedure shows a very good performance, with a -10dB bandwidth that covers the required frequencies for multi-band WLAN applications (2.4/5.2/5.8 GHz) and beyond, and an end-fire gain greater than 11 dB. View full abstract»

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  • A multi-band antenna for WLAN applications

    Publication Year: 2013 , Page(s): 262 - 265
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (729 KB) |  | HTML iconHTML  

    This paper presents a small truncated waveguide fed by a microstrip line through a transverse coupling slot for multi-band WLAN applications. The proposed radiating element allows to obtain a high radiated power, with a very low cross-polar component in the radiated field, with a -10 dB bandwidth that covers the required frequencies for multi-band WLAN applications (5.2/5.4/5.8 GHz). View full abstract»

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  • Transmission line mode analysis of wideband/multiband antennas consisting of coupled conductors

    Publication Year: 2013 , Page(s): 272 - 275
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (258 KB) |  | HTML iconHTML  

    Transmission line mode theory is used to analyze wideband/multiband small antennas consisting of several conductors. First, the modal theory is introduced with equations in order to implement the theory to antenna analysis. Eigenvalue and eigenvector matrices generated by the theoretical calculation are shown. As an example of simple analysis, ILA with a folded structure consisting of two-wire (FILA) is analyzed, and the validation of the theory is discussed. A circuit model of the FILA is used to obtain the impedance characteristics, and the relationship between the FILA and the modal theory is explained. Finally, a dual-band FILA is designed and the impedance characteristics calculated by the modal theory and simulation is compared. View full abstract»

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  • 11 GHz dual-polarization MIMO channel measurements and capacity evaluation for mobile communications

    Publication Year: 2013 , Page(s): 295 - 298
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (831 KB) |  | HTML iconHTML  

    This paper presents outdoor wideband 8×8 multiple-input multiple-output (MIMO) channel measurements using dual-polarized antennas at 11 GHz. The measurements were conducted in the urban and residential areas of Ishigaki City, Okinawa, Japan. The differences in polarization for MIMO capacity and efficiency are discussed with respect to the dependency on local propagation environments. The MIMO capacity increases in proportion to the number of antennas at least for 8×8 configuration in non-line-of-sight area. Finally, MIMO channel capacity comparison between ultra high frequency and super high frequency band cellular system is simulated using 11 GHz measurement data. View full abstract»

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  • A flat car-roof antenna module for phone and GPS applications

    Publication Year: 2013 , Page(s): 299 - 302
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1420 KB) |  | HTML iconHTML  

    A flat car-roof antenna module for phone and GPS applications is proposed. The module consists of a planar inverted-F antenna (PIFA) for the phone operation and a planar loop antenna for the GPS one. The two antennas are located in a same plane parallel to car roof and put close to each other so that the dimension of the module is only 50 × 80 mm2 in plane. Gap between the antenna plane and the car roof is only 19 mm. This low profile makes the module almost invisible when it is installed on a car roof. Even with this narrow gap, the two antennas keep high performance in their operation frequencies. View full abstract»

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  • Decoupling networks composed of lumped elements for diversity/MIMO antennas

    Publication Year: 2013 , Page(s): 307 - 310
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (363 KB) |  | HTML iconHTML  

    We show design equations for decoupling networks composed of lumped elements. These equations are valid for arbitrary two-element antenna arrays and plane-symmetrical three-element antenna arrays. The decoupling networks consist of series susceptances and shunt susceptances. We design small two-element and three-element antenna arrays with the decoupling networks, and verify the design equations by performing measurements and simulations. The sizes of the two-element and three-element antenna arrays including the ground planes are 0.12λc × 0.18λc and 0.25λc × 0.21λc, respectively. We confirm high isolation is achieved by the decoupling networks. View full abstract»

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  • Ka-band Multiple Feed per Beam antenna architecture based on interleaved 3-D directional couplers

    Publication Year: 2013 , Page(s): 367 - 369
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (585 KB) |  | HTML iconHTML  

    In this paper, an original Multiple Feed per Beam (MFB) antenna architecture is proposed, inspired from telecommunication satellite market needs. Significant overlapping of feed clusters is achieved to enhance illumination performance within a size constrained lattice. The design and the manufacturing of the antenna are reported. View full abstract»

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