Radio Science

Cover image for Vol. 48 Issue 1

January/February 2013

Volume 48, Issue 1

Pages 1–88

  1. Regular Articles

    1. Top of page
    2. Regular Articles
    1. A comprehensive sounding of the ionospheric HF radio link from Antarctica to Spain (pages 1–12)

      A. G. Ads, P. Bergadà, C. Vilella, J. R. Regué, J. L. Pijoan, R. Bardají and J. Mauricio

      Article first published online: 24 JAN 2013 | DOI: 10.1029/2012RS005074

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      Key Points

      • narrowband and wideband sounding of the ionospheric channel

      • absolute propagation time and the Doppler frequency shift

    2. Circuital characteristics and radiation properties of an UWB electric-magnetic planar antenna for Ku-band applications (pages 13–22)

      N. Haider, D. Caratelli and A. G. Yarovoy

      Article first published online: 27 FEB 2013 | DOI: 10.1002/rds.20015

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      Key Points

      • An antenna element with 3:1 impedance bandwidth is developed
      • A frequency-independent equivalent circuit has been derived
    3. Signal processing

      Threshold optimization of cooperative spectrum sensing in cognitive radio networks (pages 23–32)

      Xin Liu, Min Jia and Xuezhi Tan

      Article first published online: 28 FEB 2013 | DOI: 10.1029/2012RS005009

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      Key Points

      • The detection threshold is optimized in order to minimize the error probability
      • Non-restrained multi-channel threshold optimization (NRMTO) and restrained multi
      • The proposed algorithm outperforms the conventional cooperative spectrum sensing
    4. On the characterization of radar receivers for meteor-head echoes studies (pages 33–41)

      F. R. Galindo, J. Urbina, J. L. Chau, L. Dyrud and M. Milla

      Article first published online: 28 FEB 2013 | DOI: 10.1029/2012RS005034

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      Key Points

      • The characterization of radar receivers to study meteor-head echoes
      • The ambiguity function is used to understand the effect of meteor Doppler speed
    5. Electromagnetics

      Anomalous propagation conditions observed over a tropical station using high-resolution GPS radiosonde observations (pages 42–49)

      Ghouse Basha, M. Venkat Ratnam, G. Manjula and A. V. Chandra Sekhar

      Article first published online: 1 MAR 2013 | DOI: 10.1002/rds.20012

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      Key Points

      • The characteristics of ducts occurring over Gadanki were examined
      • Diurnal variation in the ducting characteristics has been provided
      • The maximum wavelength being trapped has been investigated
    6. Guided waves

      Wideband generalized admittance matrix representation for the analysis and design of waveguide filters with coaxial excitation (pages 50–60)

      Fermín Mira, Ángel A. San Blas, Vicente E. Boria, Luis J. Roglá and Benito Gimeno

      Article first published online: 28 FEB 2013 | DOI: 10.1002/rds.20013

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      Key Points

      • Wideband generalized admittance representation of complex waveguide filters
      • CAD tool for the analysis/design of practical filters in waveguide technology
      • Integration of the coaxial excitation in all the proposed designs
    7. Utilizing nonlinear ELF generation in modulated ionospheric heating experiments for communications applications (pages 61–68)

      G. Jin, M. Spasojevic, M. B. Cohen and U. S. Inan

      Article first published online: 28 FEB 2013 | DOI: 10.1002/rds.20014

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      Key Points

      • Data were successfully transmitted using ELF generated via modulated heating.
      • Using harmonics of generated waves can reduce the bit error rate.
      • Harmonics above 4 kHz do not reduce BER because of stronger impulsive noise.
    8. Antenna arrays

      Efficiency enhancement of single off-axis and multiple overlapping beam reflectors using dielectric-covered focal plane array feeds (pages 69–88)

      M. Ng Mou Kehn

      Article first published online: 1 MAR 2013 | DOI: 10.1002/rds.20022

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      Key Points

      • Dielectric-covered FPA feeds improve all beam angles, even overlapping ones
      • The importance of all subefficiencies lies in their full accurate characterization
      • An optimal dielectric cover is best for all beam combinations and in terms of bandwidth

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