Help:Simulate Conical Horn Antenna in HFSS

horn antenna hfss

Hi,

I've tried to simulate a conical horn antenna using HFSS. I want to find out whether by inserting a dielectric at the end of the waveguide ( trying to use it as a focal lens?), will it reduce the beamwidth or focus at some point (like in optics).

However from my simulation, I've gotten undesirable results such as reduced gain, etc. I think it is because i'm generating in the far-field.

So how should I check in the near-distance, whether the energy can is actually focus at some point before diffracted again..

This book may be useful for your simulation:

Soild dielecrtic horn antennas by Salema etal

From my simulation (actually performed by MWS, @5GHz) seems that there's some E hotspot at the end of aperture.. It's correct because of your design?
Did you make any special calculation of dielectric sphere?
I'm opened to further discussion, regards

eirp

HI,

there's some E hotspot at the end of aperture
Yes, I want the E-field to focus at a certain point beyond the horn. And wish to know compared to a model without lens, comparatively in magnitudes how much more energy can be concentrated.

However I've plotted the near E-field values for horn with and without the dielectric. I've found out that although there is a Hot spot ouside the aperture as proved also with the "horn_01.gif" eirp has attached; the actual strength is smaller as compared to no visible hot spot, but the entire area is at a higher E-field strength.

Attached are my plots for the near-field Vs normalised distance.


Did you make any special calculation of dielectric sphere?
Right now, I've absolute no idea how the shape of the dielectric, which should act as a lens, can give the optimum result.

Any suggestions?

cheers