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Radio Science
Radio Science publishes original research articles on radio frequency electromagnetic-propagation and its applications.
Browse Articles
Breast Cancer Detection Based on Simplified Deep Learning Technique With Histopathological Image Using BreaKHis Database
- 21 November 2023
Key Points
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The results of an investigation to determine effectiveness of deep learning (DL)-based systems for detecting breast cancer is presented
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The strategy here for DL training uses various image processing techniques for extracting different feature patterns
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It is shown that the convolutional neural network models provide different results for different degrees of image resolution
Iterative Gradient Correction (IGC) Method for True Height Analysis of Ionograms
- 6 November 2023
Key Points
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A new method to derive the true height profiles from ionograms that relies on computing the propagation path of radio waves with time
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Progressively constructs the true height profile by iteratively correcting the gradient between successive points until the error is <±1 km
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The Iterative Gradient Correction method gives more accurate results at the cusp and F2-peak regions and is less sensitive to scaling errors compared to POLynomial ANalysis
Effect of Urbanization Through Land Coverage Classification
- 27 October 2023
Key Points
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Study shows how remote sensing indicators assess spatiotemporal dynamics of urban growth and its environmental effects at different scales and metropolitan areas
Analysis and Application of the Electromagnetic Wave Propagation, Fields, and Dispersion Relation in an Elliptical Chiro Plasma Waveguide Immersed in Magnetized Plasma
- 26 October 2023
Key Points
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Electromagnetic waves propagation and dispersion relation in an elliptical chiro plasma waveguide immersed in a magnetized plasma
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Electromagnetic fields in the chiro plasma elliptical waveguide and in the magnetized plasma region
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The effects of the chirality parameter and the plasma and cyclotron frequencies on the power flux density
Proposal of Technique for Analysis of Complementary Frequency Selective Surfaces
- 19 October 2023
Key Points
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The CFSS analysis composed of circular rings is performed through the equivalent circuit model combined with the ABCD matrix
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The results of the simulated structures are compared with the ones obtained with the commercial software
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The simulated prototypes were built and measured to validate the performed analyses
High Performance Antenna System in MIMO Configuration for 5G Wireless Communications Over Sub‐6 GHz Spectrum
- 17 October 2023
Key Points
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A four elements multiple input and multiple output (MIMO) antenna systems operating at sub-6 GHz with ECC <0.1 and diversity >9.9 is presented for 5G communication
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A high isolation below −20 dB is achieved without the use of any decoupling network
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The MIMO system with dimension of 50×50×0.8 mm3 has 41% fractional bandwidth and gain of 4.8 dBi
Effects of the Relative Dynamics of Ionospheric Irregularities and GPS Satellites on Receiver Tracking Loop Performance
- 22 September 2023
Key Points
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Effect of Global Positioning System satellite geometry on tracking loop performance of ground-based receivers in presence of scintillation
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Study of east-west component of satellite velocity at Ionospheric Pierce Point and its correlation with occurrence of loss-of-lock
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Observation of signal fading rate, having depth <−10 dB, to study its correlation with synchronization of irregularity structure
Quantitative Relationship Between Current Pulses and Associated Low‐Frequency Magnetic Fields During Initial Stage of Rocket‐Triggered Lightning
- 20 September 2023
Key Points
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Quantitative relationship between the current pulse and associated B-field pulse for precursors and initial upward positive leader (iUPL) of triggered lightning is examined
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The peak ratio of B-field pulse versus current pulse for during the iUPL stage is larger than that for the precursory pulses
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A response function is found to show the quantitative correspondence between the B-field pulse and the current pulse in the time domain
Dual‐Band Reflectarray Antennas Using Integrated Resonant and Non‐Resonant Natures of Metallic Waveguide Elements at Millimeter Wave Frequencies
- 16 January 2023
Key Points
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This paper proposed to develop configurable composite reflecting elements for dual-band reflectarray antennas using die-casting technology
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The configurability allows the reflectarray to operate at two frequency bands with a separated focusing mechanism
GMSK Demodulation Combining 1D‐CNN and Bi‐LSTM Network Over Strong Solar Wind Turbulence Channel
- 13 January 2023
Key Points
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The K distribution channel model for the strong solar wind turbulence is innovatively established by analyzing the model of telemetry signal amplitude fluctuation caused by solar wind turbulence
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To demodulate the Gaussian minimum frequency shift keying (GMSK) signals over strong solar wind turbulence channel, two neural network demodulators based on bidirectional long short-term memory network (LSTM) and one-dimensional convolutional neural network (1D-CNN) are designed, which can obtain better bit error rate performance than the conventional coherent demodulation
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By combining the feature extraction capability of the 1D-CNN and the processing capability of LSTM for time series, we propose a novel GMSK demodulator
Model to Scale Rain Attenuation Time Series With Link Elevation Angle for LEO Satellite Based Systems
- 13 January 2023
Key Points
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A model to scale rain attenuation time series with link elevation angle offering better accuracy over the customary cosecant law scaling
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The model generates a set of rain attenuation time series maintaining the time and space correlation as a function of link elevation
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The model's accuracy is evaluated in two sites with different climatic features
Computation of Optical Refractive Index Structure Parameter From Its Statistical Definition Using Radiosonde Data
- 9 January 2023
Key Points
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Profiles of the optical refractive index structure parameter can be obtained using high-density radiosonde data
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These profiles are site-dependent and enable to identify local optical turbulent layers associated with temperature inversions
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The presented model has been validated with thermosonde measurements
Generalization Ability of Deep Learning Algorithms Trained Using SEM Data for Objects Classification
- 17 November 2022
Key Points
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Classification of spherical objects is achieved by using preprocessed data from the singularity expansion method (SEM)
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The residues allow to determine the position of the antenna relative to an object
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SEM data provide good noise robustness, high classification accuracy, and excellent generalization to any object size
Satellite radar interferometry: Two‐dimensional phase unwrapping
- Radio Science
- 713-720
- July-August 1988
A global mapping technique for GPS‐derived ionospheric total electron content measurements
- Radio Science
- 565-582
- 1 May 1998
Vegetation modeled as a water cloud
- Radio Science
- 357-364
- March-April 1978
Geodesy by radio interferometry: Effects of atmospheric modeling errors on estimates of baseline length
- Radio Science
- 1593-1607
- November-December 1985
Singular value decomposition methods for wave propagation analysis
- Radio Science
- 12 February 2003
Estimation of tropospheric delay for microwaves from surface weather data
- Radio Science
- 379-386
- May-June 1987
Statistics of total electron content depletions observed over the South American continent for the year 2008
- Radio Science
- 29 October 2011
Key Points
- First time regional plots of TEC depletions
- New numerical algorithm developed to automatically detect TEC depletions
- Day-to-day variability of TEC depletions in a regional basis
An improved equation for the radio refractive index of air
- Radio Science
- 803-807
- October 1974
Large ionospheric disturbances produced by the HAARP HF facility
- Radio Science
- 1081-1093
- 4 June 2016
Key Points
- HAARP facility produces unique results
- Artificial plasma clouds are emission and optical signatures
- Future HAARP experiments are needed to explain physics
Accurate measurements of the dielectric constant of seawater at L band
- Radio Science
- 2-24
- 2 December 2015
Key Points
- Dielectric measurements of seawater are made with a microwave cavity at 1.413 GHz
- Measurements are made as a function of temperature and salinity for values found in open ocean
- Accuracy is better than 0.3 for both real and imaginary parts of the dielectric constant
Fresnel Reflection and Transmission Coefficients for Temporally Dispersive Attenuative Media
- Radio Science
- 1382-1397
- 27 October 2018
Key Points
- General expressions for Fresnel reflection and transmission coefficients for homogeneous and inhomogeneous plane waves are derived for TE- and TM polarized plane waves in complex media with loss
- The critical angle for total internal reflection remains unchanged when material loss is included; the polarizing angle (for a TM polarized plane wave is changed otherwise, a pseudo Brewster's angle occurs at which the magnitude of the TM) polarization reflection coefficient is a minimum
- Total reflection at grazing incidence on the optically denser medium does not occur when both media exhibit loss; total reflection does not occur at critical incidence when both media exhibit loss.
Plain Language Summary
Amplitude reflection and transmission coefficients for a time-harmonic electromagnetic plane wave incident upon a plane interface separating two different lossy media are developed.
Calculating the absorption of HF radio waves in the ionosphere
- Radio Science
- 767-783
- 5 June 2017
Key Points
- Either the Appleton-Hartree or Sen Wyller dispersion relation can be used to calculate absorption
- It is necessary to utilize the correct collision frequency specification for each dispersion relation
- Geophysical variations of collision frequency should be included in absorption calculations
An Indoor Path Loss Prediction Model Using Wall Correction Factors for Wireless Local Area Network and 5G Indoor Networks
- Radio Science
- 544-564
- 2 April 2018
Key Points
- A modified effective wall loss model (EWLM) for indoor environment is presented
- Real-time measurements and simulations for various indoor path loss models are used
- Several frequency spectrum band were considered for evaluation purposes
Radio wave propagation through vegetation: Factors influencing signal attenuation
- Radio Science
- 7 October 2003
Modular Link Level Simulator for the Physical Layer of Beyond 5G Wireless Communication Systems
- Radio Science
- 1 February 2022
Key Points
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A modular physical layer simulator for communication systems in the THz range according to IEEE 802.15.3d-2017 is presented and validated
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Link level simulations for a top-of-rack scenario show the impact of modulation and coding schemes, waveforms and RF impairments
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LOS conditions and strict requirements on linearity of RF devices are a prerequisite for higher order modulation schemes
Plain Language Summary
Terahertz communications are a promising candidate to deliver very high data rates up to 1 Tbit/s for next generation wireless systems. In this paper we present a new simulation module of the Simulator for Mobile Networks (SiMoNe) for the physical layer that considers important effects such as waveforms and impairments of radio frequency devices. The simulator is compared to the state of the art and its principles and basic building blocks are explained. Moreover, the simulator is validated and applied to a top-of-rack scenario in a future data center with wireless links on top of racks. The simulations show the necessity of line-of-sight conditions and high requirements on the electronic devices for a successful transmission over longer distances. The gained data set of simulation results can be used for further investigations on higher layer performance by the community.
Formulas of dielectric and total attenuations of a microstrip line
- Radio Science
- 5 October 2010
A Review on Different Techniques of Mutual Coupling Reduction Between Elements of Any MIMO Antenna. Part 1: DGSs and Parasitic Structures
- Radio Science
- 4 February 2021
Key Points
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Multiple-Input-Multiple-Output (MIMO) patch antenna is required for high data rate transmission without additional bandwidth requirement
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Mutual coupling reduction among antenna elements is a significant challenge while designing a compact antenna array system
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Defected Ground Structures and Parasitics elements/structures for mutual coupling reduction have been discussed thoroughly in this article
Plain Language Summary
A comprehensive two-part review article with more than 330 references is proposed.
