truncated ground plane
plz tell me what is the truncated ground plane?
how can i make it in HFSS or CST simulation?
whats the benifit of the truncated ground plane over normal ground plane and why we use it?
plz reply ..i am waiting for your suggestion......................
Truncated ground planes or ground planes with discontinuities could affect the radiation pattern of the antennas, especially for the monopoles and ground-plane antennas where the image field depends by the ground current.
Discontinuities in the ground plane increase the ground loss resistance producing lower radiation efficiency.
For patch antennas using a texture ground plane, changing in this way the surface wave loss, can modify the impedance bandwidth of the antenna.
truncated ground planes are used to widen the BW.. as using partial ground planes wil increase of decreasing the effective permittivity so increasing the BW in consequence
thank you very much for replying answer.....................
Hi
The oposite of the truncated ground plane is infinite ground plane. With exeption of some doubious tricks, EM simulators are not suitable for simulating infinite gnd planes, so one has to truncate it. Anyhow, one cannot make infinite gnd plane, so the results of the simulations are realistic.
On the other hand, for almost every wellknown structure (microstrip, CPW, slotline etc.) there is an approximate dimensional limit when the difference beween infinite and truncated gnd plane is negligible.
As pointed above, in some occasions, there is a benefit of making gnd short (truncated).
flyhigh
I don’t think “short” terminology is the same as “truncated” when we are talking about antenna ground planes.
Maybe we can say this only when the ground is truncated at the margins, but ground could be truncated (or textured) everywhere, even in the middle, and this will affect the antenna behavior, or the simulation.
Hi vodafone
I believe you are wright regarding antenna application (I am really not an expert in that field).
However, in the original question there is not any reference (obvious to me) to restrict the question to antenna applications, so I gave more like "microwave integrated circuit point of veiw" explaination. I have some experience in truncating slotline and CPW gnd planes, differences can be rather significant in some cases, as you pointed out for the case of antenna applications.
flyhigh