Description

Quadrax is a 4 channel dif-ferential connector suitable for high speed electrical net-work applications. According to its data sheet, this Souri-au-Corporation manufac-tured quadrax contact has excellent network perfor-mances, minimum crosstalk, and perfect matching. It is designed to operate in harsh environments and handles a high density of links. Here we show how to model an Ethernet 100 Mbps quadrax contact using HFWorks in an S-parameter simulation at 2.5 GHz.

Figure 1: Quadrax 3D view

Through this simulation, we aim at finding the frequency responses of the device: basi-cally insertion and return loss-es. An S-parameter simulation provides what is intended here: The frequency plan is discrete with a samll step between 100 MHz and 2.5 GHz. We can also view the propagation of the wave within the quadrax and measure the field intensity in or along user-defined curves within the shape: i.e. we can set a group of points out of which we create an electric field 2D plot.

Simulation Boundary ConditionsThe quadrax has two ports on the two lateral sides of the transmission paths. The propagation is in the TEM mode. We have four signal boundary conditions with a perfect electric conductor at outer fece of the quadrax.

Results

At the desired user-defined center-frequency, we can view the electric and magnet-ic field in different settings: i.e. iso and section clipping, animating the field through varying its omega-T phase, changing the colors of the chart to show intensity ... . Here is a capture of an elec-tric field distribution spot-ted within the surface of the quadrax’s outer face. Figure 2: Near field distribution

We can also check up on the on the field inner distribution by using the iso clipping feature (See next figure)

Figure 3: Inner Electric field distribtuin

Figure 4: Insertion/ Return loss

The return and insertion losses is in a good range and meets the expectations and measurements of the manu-facturer. As mentioned ear-lier, we can go for further results and investigate every single point by probing it on a 3D electric field plot. Here is an example of the electric field variation from the cen-tral axis towards the lateral face: the X-axis is numbered using the ordinal numbers of the nodes in the created mesh, in the order of selec-tion which means that the order of these nodes obey chronologically to the order of the nodes selection by the user.

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