Hi in the planer slot antenna backed by SIW cavity, I am having problem excitation. I have attached the picture.
I have used the terminal mode and used the wave-port excitation.
Biswash Paudel you haven't provided any relevant information. By what metric(s) does this antenna have problems? Is the input reflection coefficient too high? Is the gain too low? What do you expect to achieve?
Hi Stuart Barth I am having problem as the excitation. All the radiation is coming out from the input port which is shown in the pic. I am getting confused in matching the input impedance. Is it the size of the wave port ? or something else?.
Biswash Paudel I think you are confusing some concepts. By far, the best way to determine if power is actually "coming out from the input port" is to look at the reflection coefficient (S11).
I think you are confusing the far-field radiation plot of the antenna with something else. The far-fields are always plotted at the origin, for convenience. Since your input port is also close to the origin, it appears that the plot overlaps with the port. The radiation plot shows the far-fields directed downwards -- but please don't misinterpret this as "the power is directed downwards at the port". It simply means that the net effect of your system is that power is radiated in the downward direction.
You can plot reflection coefficient (S11), input impedance (Z11), and magnitude of the antenna gain in HFSS. Show us these values -- they will for sure indicate if your antenna is working well or not.
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