What is reference plane in PCB?
The most ideal return path for a signal in a circuit board is a large area of metal, or a plane layer, which becomes the reference plane. Usually, this will be a ground plane, and it needs to be on an adjoining layer to the signal trace with a layer of dielectric between them.
Do I need a ground plane?
If you’re using a circuit modeling tool such as spice, you should replace your “solid” connections with circuits equivalent to trace impedances. You can then determine if the voltages dropped across those impedances are an issue or not. Idealy you should always use a ground plane.
Why does an antenna need a ground plane?
In the case of a 1/4-wave antenna, the ground plane acts as the counterpoise to form, in essence, a centered 1/2-wave dipole. Since this plane is the other half of the antenna, its size and proximity are essential. Often an antenna can appear smaller than its specified wavelength.
What is stitching capacitor?
The stitching capacitor enables the return current to travel from one reference plane to the other. The capacitor should be placed close to the signal path so that the distance between the forward and return path are kept small. Generally, the values of stitching capacitors are between 10nF and 100nF.
What does ground plane independent mean?
Ground independent antennas are antennas that have been designed to incorporate in its functionality a simulated ground plane to allow it to perform efficiently with a minimum or no ground plane. These antennas are generally comprised of a minimum of a ½ wave element.
What is the voltage potential for non ground reference?
The voltage potential for non-ground reference is the algebraic sum of the two points. If you measured from A to B, it would be five from A to C it would be nine and so forth. Voltage measurement with respect to ground. Now, here we have a circuit that is drawn a little bit different than you might expect.
Which is a reference point other than ground?
In some cases, the voltage is measured that is the reference to a point other than ground. So if you’re measuring point A, the reference point would be ground. So here, if we measured from point A to ground, we got 21 volts.
What is the effect of the ground plane?
The effect of the ground plane is to significantly reduce the common ground impedance Z G, by between 40 – 70dB. The actual improvement is not as great as this because the return current spreads out to some extent from directly underneath the signal track. Figure 5.14. Crosstalk equivalent circuit
What does ground plane mean in Electrical Engineering?
In electrical engineering, a ground plane is an electrically conductive surface, usually connected to electrical ground. The term has two different meanings in separate areas of electrical engineering.