Cost-Effective Implementation of Air-Filled Waveguides on Printed Circuit Boards

Sepaintner, Felix; Scharl, Andreas; Jakob, Johannes; Keck, Florian; Kunze, Kevin; Rohrl, Franz Xaver; Bogner, Werner; Zorn, Stefan

doi:10.1109/epeps48591.2020.9231382

Cited by 2 publications

(4 citation statements)

References 5 publications

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“…In order to identify the mechanisms of coupling, air was assumed as TL dielectric substrate material and annular fluid to allow the determination of EM field distribution within the modeling domain. This assumption is consistent with practical air-filled transmission lines [49], [50], [51].…”

Section: B Solution Methodologysupporting

confidence: 86%

Waveguide Analysis of Radiofrequency Transmission in Well Tubulars for Electromagnetic Heating of Heavy Oil

2023

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This paper presents the numerical modelling and simulation of a 2D vertical well tubular model excited by a coaxial radiofrequency transmission line placed in its annular space for the purpose of downhole RF energy transmission. The study identifies the mechanism of energy losses due to coupling between the transmission line and steel tubing and casing using resonance mode analysis. The design of a left-handed artificial power line is proposed to minimize the losses due to the right-handed properties of the coaxial transmission line. The design utilizes ideal lumped element method to determine the left-handedness of the right-handed coaxial transmission line over the industrial heating radio-frequency band. The model is developed and simulated using COMSOL multi-physics commercial simulation software. The effect of transmission line position within the annular space on the tangential magnetic field and resulting power losses along the tubing is discussed. It is observed that the resulting artificial power line improves RF power transmission over 60 m depths of the vertical oil well within the industrial heating radiofrequency band.

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Section: B Solution Methodologysupporting

confidence: 86%

Waveguide Analysis of Radiofrequency Transmission in Well Tubulars for Electromagnetic Heating of Heavy Oil

2023

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“…The replication of large recesses as analyzed in Section 3.2 shows that recesses with high wall thickness variations can be manufactured by injection-compression molding even with high-temperature thermoplastics. Large recesses in 2.5D substrates could be used to form SMD-mountable air-filled waveguide devices on PCBs, as described in [10,40]. The manufactured recesses with a depth of about 500 µm could be used to form air-filled waveguides up to a size of WR-4 (height = 0.5461 mm) [41].…”

Section: Discussionmentioning

confidence: 99%

“…Concepts for micromachined transmission line structures were, as mentioned above, reported by several publications [4][5][6][7][8][9][10][11][12][13]. The main benefit of trenches in the isolation gaps between signal and ground traces in CPW transmission lines is the reduction of the effective permittivity DK e f f that is experienced by transmission lines, as only a part of their electromagnetic field is concentrated in the dielectric.…”

Section: Discussionmentioning

confidence: 99%

“…Advanced transmission line structures, also known as micromachined transmission line structures, can offer especially low losses and improved performance [4][5][6][7][8][9][10][11][12][13]. While most of the publications are dedicated to structures on silicon, some publications are available that deal with such structures on PCB substrates [6,8,10]. The main drawback of micromachined structures on PCBs is the sequential mechanical milling or laser milling process that is necessary to form the structures needed.…”

Section: Introductionmentioning

confidence: 99%

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Injection Compression Molding of LDS-MID for Millimeter Wave Applications

Wolf,

Werum,

Eberhardt

et al. 2023

JMMP

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LDS-MIDs (laser direct structured mechatronic integrated devices) are 3D (three-dimensional) circuit carriers that are used in many applications with a focus on antennas. However, thanks to the rising frequencies of HF (high-frequency) systems in 5G and radar applications up to the mmWave (millimeter wave) region, the requirements regarding the geometrical accuracy and minimal wall thicknesses for proper signal propagation in mmWave circuits became more strict. Additionally, interest in combining those with 3D microstructures like trenches or bumps for optimizing transmission lines and subsequent mounting processes is rising. The change from IM (injection molding) to ICM (injection compression molding) could offer a solution for improving the 3D geometries of LDS-MIDs. To enhance the scientific insight into this process variant, this paper reports on the manufacturing of LDS-MIDs for mmWave applications. Measurements of the warpage, homogeneity of local wall thicknesses, and replication accuracy of different trenches and bumps for mounting purposes are presented. Additionally, the effect of a change in the manufacturing process from IM to ICM regarding the dielectric properties of the used thermoplastics is reported as well as the influence of ICM on the properties of LDS metallization—in particular the metallization roughness and adhesion strength. This paper is then concluded by reporting on the HF performance of CPWs (coplanar waveguides) on LDS-MIDs in comparison to an HF-PCB.

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Cost-Effective Implementation of Air-Filled Waveguides on Printed Circuit Boards

Cited by 2 publications

References 5 publications

Waveguide Analysis of Radiofrequency Transmission in Well Tubulars for Electromagnetic Heating of Heavy Oil

Waveguide Analysis of Radiofrequency Transmission in Well Tubulars for Electromagnetic Heating of Heavy Oil

Injection Compression Molding of LDS-MID for Millimeter Wave Applications

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