dual band filter

Hi All,

I am currently trying to design a dual-band dipole in HFSS. The idea is to create the two resonant frequencies by inserting a filter at some point of the dipole cylindrical arm which allows the signal to pass at the lower frequency and does not at the higher resonant frequency.

The thing is I don't know how to insert such a filter in HFSS. I first tried to use Lumped RLC by creating an extra cylinder and assigning it this type of boundary condtion. But it appears that this only simulates a parrallel R,L,C circuit, thus synthetizing a filter cannot be done with Lumped R,L,C.

Does anybody have a clue on how to proceed?

Thanks.

hi
i need a dual band dipole antenna design. I am new on hfss . can you help me please

thanks

Hi hasanynlmz,

For your dual band dipole you could choose to design a dipole with a trap.
You can find a lot of informations about trap antennae with a quick search.

But basically it is a LC resonator tuned at the higher frequency of the two of interest, and it allows the current to flow at your lower frequency whereas at your higher frequency it acts as a very high impedance. So with just a single fed dipole you can have a dual band antenna thanks to the trap.

In HFSS in order to model the LC circuit you need to use the RLC lumped in Assign Boundary once you've created your structure for the trap (generally a cylinder in pec)


Hope this would help

Good luck!