The overall signal trace length is about one wavelength long and there are normally four lobes at the 5500 MHz band, but, due to the ground trace
is also acts as a sleeve balun, a close to complete radiation shape (there are a few variations in the radiation pattern-shapes) was obtained.
In this case, however, the excitation of common-mode currents on the DC supply loop produces the in-phase x-directed components and out-of-phase y-directed components between the power trace and the ground trace
. Therefore, the x-directed components dominate the common-mode currents on the DC supply loop.
Placing a ground trace
between high-frequency lines creates a barrier so signals remain confined.
For example, if an engineer plans to use individual cans to separate two cavities, each can needs its own ground trace
with space between them.
When the adjacent ground trace
is brought close, it will intercept these fringe fields, but they will also go to ground (FIGURE 2).
Parameters [L.sub.p] and [L.sub.g] denote the inductance of the power and ground trace
of DC supply loop on PCB and the element values were derived by using Ansys-Ansoft Q3D Extractor.
Multi-cavity shields can isolate tightly-packed components, but the shields are only as effective as their mating to the ground trace
on the PCB.
The flatness of the SE data at the lower frequencies can be explained by the fact that apertures in the shield walls, the attachment points to the ground trace
, and the vias that connect the ground trace
to the ground plane are all in the near field of the radiators.
The GORE-SHIELD[R] SMT EMI gaskets can be used as a RF grounding pad or interconnect as well as in EMI shielding applications where the gaskets are placed along the ground trace
on a PCB.
It's best to run a clock net and then have a ground trace
shielding the entire path of the clock trace.
The board-level shield is typically a box-like metallic component that is placed over the component(s) to be shielded and then soldered to a ground trace
on the board to effect shielding.