Radiation of a Flat Waveguide Closed by Molted Heat Protection

Mikhailov, V.F.

doi:10.1109/weconf.2019.8840592

Cited by 3 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If we consider a round1 waveguide in the form of an onboard antenna of the returned spacecraft, then due to aerodynamic heating, a melt layer appears on the outer surface of the heat shield, which has electrical characteristics different from the characteristics of the material in the solid phase. Then the radiation from the waveguide should be considered through a two-layer dielectric thermal protection [10].…”

Section: Discussionmentioning

confidence: 99%

Characteristics of Radiation of a round Waveguide through a Flat Homogeneous Heat Shield

Mikhailov¹

2020

Waveguide Technologies in Photonics and Microwave Engineering [Working Title]

View full text Add to dashboard Cite

The problem of obtaining an analytical description of the radiation characteristics of a circular waveguide closed by a flat homogeneous dielectric plate is solved. The radiation characteristics include: the radiation field; the conductivity of the aperture radiation; and the fields of surface, flowing, and side waves, as well as energy characteristics. In such a statement, a strict solution of Maxwell's equations is required. The paper uses the method of integral transformations and the method of eigenfunctions. In this case, the assumption is used that the electrical parameters of the dielectric plate (thermal protection) and the geometric dimensions do not depend on time. The relations describing the directional diagram of a circular waveguide with dielectric thermal protection and taking into account the electrical parameters of thermal protection and its thickness are obtained. Expressions are also obtained for the fields of lateral, surface, and outflow waves, from which it is possible to calculate the power taken away by these fields. Numerical calculations were made for some of the obtained relations. The results showed that the power of the side waves is zero. It also follows from the calculations that the radiation field of surface and flowing waves is absent, that is, their contribution to the directional diagram is not.

show abstract

Section: Discussionmentioning

confidence: 99%

Characteristics of Radiation of a round Waveguide through a Flat Homogeneous Heat Shield

Mikhailov¹

2020

Waveguide Technologies in Photonics and Microwave Engineering [Working Title]

View full text Add to dashboard Cite

show abstract

“…where p(k z ) is equal to ( wall k 2 0 − k 2 y − k 2 z ) 0.5 . The transformation to the polar coordinate system, which are z = r cos(θ) and y − a = r sin(θ), and the method of steepest descent [25] make (22) be:…”

Section: Propagation Model For Signal Strength-based Ranging a Exponential Propagation Functionmentioning

confidence: 99%

“…Equation (25) indicates that the radiation is proportional to the mean perturbation. E | F (β m − √ wall k 0 cos(θ))| 2 in (24) can be approximated by Taylor series at θ = 0 for the integration:…”

Section: Propagation Model For Signal Strength-based Ranging a Exponential Propagation Functionmentioning

confidence: 99%

Fine-Resolution Ranging Scheme Based on Signal Strength in Indoor Hallway With Rough-Surface Slab Waveguide

Park

Hyun

Lee

et al. 2021

IEEE Trans. Instrum. Meas.

View full text Add to dashboard Cite

The received-signal-strength (RSS) is widely used in the range-based localization because of its practical advantages such as low-cost and low-complexity. For accurate ranging based on the RSS in indoor environments, well-defined propagation models that consider the distortion of the RSS due to abrupt obstructions are required. This paper proposes an exponential propagation model for indoor hallways whose structures can be modeled as a slab waveguide. This waveguide-shaped structure has two main power loss mechanisms: wave penetration and scattering. These loss mechanisms are quantified as exponential coefficients according to the law of conservation of energy. The surface-scattering theory and multi-mode waveguide concept are utilized for the quantification of scattering and penetration, respectively. The proposed model is verified through actual site measurements using the vector network analyzer-based channel sounding system at IEEE 802.11ax frequency bands. The estimated range obtained from the measured data indicates that the proposed model leads to the ranging estimation performance that could not be achieved with existing sounding-based indoor channel models.

show abstract