Construction Principles of Quadrifilar Helical Antennas

Shcherbyna, Olga; Kozhokhina, Olena

doi:10.1615/telecomradeng.v79.i16.30

Cited by 4 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The radiation patterns of ring AA, in addition to the main polarization component of the radiated field, possess a spurious (crosspolarization) component. The spurious component is absent only when the AA is formed from longitudinal rulers and when the RP is considered in the equatorial plane (𝜃 = 𝜋 2 ⁄ ) [10][11][12][13]. Calculation of the RP of ring arrays is significantly complicated both because of the need to take into account diffraction phenomena on the antenna surface, and because the characteristics of each radiator of the array must be found in the presence of all the others, i.e., taking into account their interaction.…”

Section: Antenna Array Analysismentioning

confidence: 99%

Development of antenna system for use in meteorological and climatic control complexes

Kudryashov

Belousov

Tetyukhin

et al. 2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The synthesis of a cylindrical antenna array for ground-based mobile weather monitoring complexes, based on quadrifilar radiators, is considered. The basic mathematical expressions for determining the electrodynamic characteristics of both the radiator from the antenna array and the AA itself are presented. Various phenomenological models of these radiators are considered. The approach to the synthesis of phenomenological models of the radiator and antenna array as a whole is described. The results of such synthesis are given, and the main characteristics and values of DG, CG, SWR, RP for the given type of radiator and AA in the corresponding frequency range are obtained. Techniques for using phenomenological models for operational synthesis of electrodynamic structures such as cylindrical AA and quadrifilar radiator are developed and described in detail. The possibility of applying this approach to the synthesis of this type of structures for radar weather monitoring systems is shown.

show abstract

Section: Antenna Array Analysismentioning

confidence: 99%

Development of antenna system for use in meteorological and climatic control complexes

Kudryashov

Belousov

Tetyukhin

et al. 2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…For example, log-periodic antenna [8] can be used as an element with linear polarization, which allows to significantly expand the operating frequency range. For arrays with circular polarization, it is possible to use helical or quadrifilar antennas [9], which will increase the accuracy of determining the polarization parameters of the field under study.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Circular and Linear Orthogonal Polarization Bases in Electromagnetic Field Parameters Measurement

Ilnitsky¹,

Shcherbyna²,

Yanovsky³

et al. 2022

IJIGSP

View full text Add to dashboard Cite

This article considers the peculiarities of using circular orthogonal polarization basis for measuring the parameters of an electromagnetic wave. In particular, the angle of inclination of the major axis of the polarization ellipse and the ellipticity coefficient are among measuring parameters. The main expressions for calculation of field parameters in circular and linear orthogonal polarization basis are developed and analyzed. The advantages of using the ring as a measuring antenna in comparison with symmetrical vibrators of the turnstile antenna are substantiated. The expressions obtained in the article for calculating the measurement errors of polarization parameters in a linear orthogonal polarization basis illustrate the multifactorial dependence of the measurement accuracy on the angular and amplitude parameters. In contrast to the linear polarization basis, in case of circular basis, the inclination angle of the polarization ellipse axis can be found by direct measurements of the phase shift, and the accuracy of measuring the ellipticity coefficient is affected only by the error of measuring the ratio of voltage amplitudes, which are proportional to the modules of the field strength vectors of the left and right directions of the circular polarization rotation. This provides better potential accuracy of measurement for the electromagnetic wave parameters when using circular polarization antennas and, correspondingly, more reasonable analysis in the circular orthogonal polarization basis.

show abstract

“…Although this strive towards long-term fully autonomous UAS missions is a broad objective that will take many years to achieve, this work takes a small step toward that goal by utilizing RF capabilities in two forms: obtaining weather information and signal separation and identification. 1 A summary of work for this thesis research includes:…”

Section: Motivationmentioning

confidence: 99%

“…All supporting code, simulations, and 3D print models can be found on the project's GitHub repository. 1 Figure 3.12: DJI M100 with V-Dipole Antenna…”

Section: Dynamic Testingmentioning

confidence: 99%

“…The software pipeline is available for use and can be found on the Northeastern Field Robotics Laboratory's GitLab instance. 1 There are some open, known issues in the repository that are being fixed, and the repository is open for external collaborators to help improve the code. Although the publish rate at the moment is slow, resulting in some loss of information between the spectrogram images, the overall pipeline is successful and able to continually output signal predictions in real time.…”

Section: Spectrogram Outputmentioning

confidence: 99%

See 1 more Smart Citation

Radio frequency spectrum utilization on UAS for long-term autonomous missions

Manore

View full text Add to dashboard Cite

Thesis xii I would like to thank Dr. Alan J. Fenn and members from Group 86, MIT Lincoln Laboratory, for providing advice on designing an impedance matched circuit for the VHF frequency range. I would like to thank my advisor, Professor Hanumant Singh, for allowing me to conduct this research in his lab group and providing me the tools and resources to complete my research successfully. I would like to thank members of Group 107, MIT Lincoln Laboratory, for providing technical mentorship and guidance.

show abstract

Construction Principles of Quadrifilar Helical Antennas

Cited by 4 publications

References 0 publications

Development of antenna system for use in meteorological and climatic control complexes

Development of antenna system for use in meteorological and climatic control complexes

Comparison of Circular and Linear Orthogonal Polarization Bases in Electromagnetic Field Parameters Measurement

Radio frequency spectrum utilization on UAS for long-term autonomous missions

Contact Info

Product

Resources

About