Broadside coupled strip inset dielectric guide and its directional coupler application

In the age of digital transformation of production processes in industry and science the development and design of intelligent flow sensors for granular and liquid substances transferring through pipelines becomes more important. With this in view new approaches for improving the accuracy of microwave flowmeters are proposed. Taking into account the characteristics ofelectromagnetic waves propagating through a pipeline, a wave scattered by inhomogeneities of the controlled medium is analyzed. Features of the transformation of the polarized scattered wave limiting the geometric dimensions of the pipeline and optimizing the values of the useful scattered signal are revealed. Expediency of collection of the information signal with orthogonal polarization of the scattered wave and through a directional coupler is substantiated. The method of estimating the measurement accuracy with reference to the signal-to-noise ratio at the input of the processing device is given. The research results can be used in cryogenic machine engineering to measure volume and mass flows of liquid cryogenic products.

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ULTRA WIDEBAND DIRECTIONAL COUPLER 3 - 18 GHZ

Materials of the VIII All-Russian Scientific and Technical Conference "EXCHANGE OF EXPERIENCE IN THE FIELD OF CREATION OF ULTRA BAND RADIO ELECTRONIC SYSTEMS" ◽

10.25206/978-5-8149-3074-3-19-26 ◽

2020 ◽

Author(s):

A. A. Belousov ◽

◽

T. V. Starinova ◽

Keyword(s):

Directional Coupler ◽

Ultra Wideband

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Design and measurement of broadband loop mirror with curved directional coupler based on Si waveguides

Japanese Journal of Applied Physics ◽

10.35848/1347-4065/abbe68 ◽

2020 ◽

Vol 59 (11) ◽

pp. 112002

Author(s):

Takuya Mitarai ◽

Eissa Moataz ◽

Takayuki Miyazaki ◽

Tomohiro Amemiya ◽

Nobuhiko Nishiyama

Keyword(s):

Directional Coupler ◽

Loop Mirror

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Simplified Analysis and Applications of Single Mode Active Directional Coupler with Parallel Electrodes

Menoufia Journal of Electronic Engineering Research ◽

10.21608/mjeer.2009.65239 ◽

2009 ◽

Vol 19 (1) ◽

pp. 47-62

Author(s):

Adel l Zaghlou ◽

Rasheed El-Awady ◽

Sayed Kamel ◽

Sohair Mahfouz

Keyword(s):

Directional Coupler ◽

Single Mode ◽

Simplified Analysis

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New structure of optical homodyne receiver utilising a 4×4 fibre directional coupler

Electronics Letters ◽

10.1049/el:19880824 ◽

1988 ◽

Vol 24 (19) ◽

pp. 1212 ◽

Cited By ~ 5

Author(s):

Xiaopin Zhang ◽

Zhang Sun ◽

Peida Ye

Keyword(s):

Directional Coupler

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Low-Loss and Broadband Nonvolatile Phase-Change Directional Coupler Switches

ACS Photonics ◽

10.1021/acsphotonics.8b01628 ◽

2019 ◽

Vol 6 (2) ◽

pp. 553-557 ◽

Cited By ~ 44

Author(s):

Peipeng Xu ◽

Jiajiu Zheng ◽

Jonathan K. Doylend ◽

Arka Majumdar

Keyword(s):

Phase Change ◽

Directional Coupler ◽

Low Loss

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A balanced-to-balanced directional coupler based on branch-slotline coupled structure

Frequenz ◽

10.1515/freq-2019-0199 ◽

2020 ◽

Vol 74 (11-12) ◽

pp. 427-433

Author(s):

Yaxin Liu ◽

Feng Wei ◽

Xiaowei Shi ◽

Cao Zeng

Keyword(s):

Directional Coupler ◽

Return Loss ◽

Design Method ◽

Differential Mode ◽

Arbitrary Power ◽

Measurement Results ◽

Transition Structures ◽

Coupled Structures ◽

Better Than ◽

Good Agreement

AbstractIn this paper, a balanced-to-balanced (BTB) branch-slotline directional coupler (DC) is firstly presented, which can realize an arbitrary power division ratios (PDRs). The coupler is composed by microstrip-to-slotline (MS) transition structures and branch-slotline coupled structures. The single-ended to balanced-ended conversion is simplified and easy to implemented by the MS transition structures, which intrinsically leads to the differential-mode (DM) transmission and common-mode (CM) suppression. Moreover, the different PDRs which are controlled by the widths of branch-slotlines can be achieved. In order to verify the feasibility of the proposed design method, two prototype circuits of the proposed coupler with different PDRs are fabricated and measured. The return loss and the isolation of two designs are all better than 10 dB. Moreover, the CM suppressions are greater than 35 dB. A good agreement between the simulation and measurement results is observed.

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Focused Patterning of Electrospun Nanofibers Using a Dielectric Guide Structure

Polymers ◽

10.3390/polym13091505 ◽

2021 ◽

Vol 13 (9) ◽

pp. 1505

Author(s):

Byeongjun Lee ◽

Younghyeon Song ◽

Chan Park ◽

Jungmin Kim ◽

Jeongbeom Kang ◽

...

Keyword(s):

Spatial Distribution ◽

Finite Elements ◽

Electric Field ◽

Electrospun Nanofibers ◽

Electrospun Fibers ◽

Continuous Line ◽

Key Factors ◽

Key Technology ◽

Vertical Electric Field ◽

Dielectric Guide

The patterning of electrospun fibers is a key technology applicable to various fields. This study reports a novel focused patterning method for electrospun nanofibers that uses a cylindrical dielectric guide. The finite elements method (FEM) was used to analyze the electric field focusing phenomenon and ground its explanation in established theory. The horizontal and vertical electric field strengths in the simulation are shown to be key factors in determining the spatial distribution of nanofibers. The experimental results demonstrate a relationship between the size of the cylindrical dielectric guide and that of the electrospun area accumulated in the collector. By concentrating the electric field, we were able to fabricate a pattern of less than 6 mm. The demonstration of continuous line and square patterning shows that the electrospun area can be well controlled. This novel patterning method can be used in a variety of applications, such as sensors, biomedical devices, batteries, and composites.

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