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The dielectric is somewhat lossy with er=4.4 and loss tangent=0.02. Also, the substrate thickness is 16mm which is 0.1 lambda (for min sweep freq of 2GHz) and 0.26 lambda (for max sweep freq of 5GHz).
So, I think you are right in that it is a combination of these two elements that is...
One wavelength on each side is 30 cm on each side for frequency of 1 GHz. This means the substrate would be 60 cm plus length on one side and 60 cm plus width on another side. This would be a very huge microstrip patch antenna.
On another note, the gain on my antenna is very bad below zero...
How far is the patch from the edge of the substrate? In my experience, this only happens if its too close, or if the radiation efficiency of the antenna is relatively low (< 0.5).
It is farther than lambda by 4 for sure, which is what is recommended, I thought.
Could you elaborate on what you mean by "default the extents to 0.015 for both vertical and horizontal padding"?
Also, I must add that MoM simulation with infinite substrate and no airbox does not show the ripples. So, this begs for the question of how accurate are these MoM simulations with...
I modeled a microstrip patch antenna in HFSS with airbox only lambda by 4 over the patch antenna. The airbox sidewalls and base touched the antenna, so none of the substrate edge scattering ripples are seen in the S11 results.
I, then, fabricated the antenna and saw bunch of ripples in the S11...
The gain plot is attached. It is a microstrip patch antenna. It has a wide impedance bandwidth between 2 and 5 GHz but its gain at broadside is negative very much throughout the bandwidth. I believe the low gain may be due to substrate edge diffraction.
In which application can I use an antenna...
Could you send me a link to this equation:
Antenna_Efficiency(%) = 100*[Rr / (Rr+Rd)]
where Rr is Radiation Resistance (wanted) and Rd is Radiated Dissipation (unwanted)
I only found this equation: R = Rloss + Rrad, which says electrical resistance = Loss (ohmic) resistance + radiation...
so can you have an antenna which is perfectly matched at 800 MHz have zero or negative gain at 800 MHz?
in other words, any link between return loss and gain?
Isn't efficiency the link between return loss and gain? If an antenna is matched, it is efficient. Gain = directivity x efficiency, so...
So high antenna gain has nothing to do with how the antenna will propagate in certain direction?
As mentioned before, I am under the impression high gain antenna makes the signal "stronger" in one direction, and I interpret "stronger" to mean that the signal can travel further with less...
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