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Fringe Capacitance of Open-Ended Coax

Termination Type

• Bare Radiating Open: The termination is a flush cross-section of a bare coax cable, surrounding objects and radiation loss makes it somewhat unpredictable in practical uses. Rarely analyzed or used. Abbrevation: Radiating.

• Flanged Radiation Open: The outer conductor is extended perpedicular to the axial direction of the coax, creating a ground plane. This geometry is commonly

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2D and 3D Field Solver Analysis of Differential Microstrips on JLCPCB's FPC Substrate

The following FPC configurations have been analyzed using TNT-MMTL, a free and open-source 2D field solver using electrostatic approximation and MoM.

TNT-MMTL is efficient but cannot simulate "true" floating conductors (such as an unconnected shield), the conductor must be either a signal conductor (albeit unexcited) or an ideal grounded conductor. Hence, openEMS is used to perform 3D full-wave simulations to cross-verify the shielded results.

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SMA Connector Pin & Dielectric Tolerances

You're in a maze of incompatible SMA connectors, all alike.

SMA connectors are the most common microwave connector, widely used in analog and digital signal transmission and measurement. However, it suffers from inconsistent standard, a problem rarely known outside metrology labs. Most connectors on the market are not designed for lab applications, this problem affects most commercial, industrial and even military grade connectors. Their center pin and dielectric positions often have loose tolerances, potentially

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JLCPCB

JLC04161H-7628 (1.59 mm ± 10% nominal)

Layer	Material	Thickness (mm)	Note
L1	Copper	0.035	1 oz
Prepreg	7628 (49% RC)	0.21040
L2	Copper	0.0152

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To implement loop tiling, the 3D space must be broken into independent tiles according to the data dependencies of the FDTD kernel. Thus, each tile must be "self-contained" without the need to access field coordinates outside the cell - There should be no "spooky action from a distance".

However, some openEMS engine extensions break this assumption:

Engine	Compatible
engine_ext_cylinder.cpp	No?

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The following insturctions have been tested on Fedora 36.

Install openEMS

1. Clone the git repository

    cd ~/
    git clone --recurse-submodule https://github.com/thliebig/openEMS-Project.git
   

2. Install Dependencies

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