# helix antenna prob. : hfss

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#### abhi_kolkata

##### Member level 5
hi,

im faced with the problem of simulating a helix antenna in hfss. i have created a valid helical antenna with ground plane and coaxial feed .but the actual simulation is taking a lot of time, and getting struck just after initial meshing.

so does anybody have any idea of how to reduce the simulation time and get it simulated sucessfully.may be i need to use any suface meshing approximation for the solid helical surface (i am in doubt).OR some other effective method.

witing fo ur replies

with regards
abhi

#### danteh

##### Newbie level 2
if you use 16 segments per turn and square section of wire, you obtain a very important reduction of time and memory use.
For example: I have used it in a helix antenna (bifilar helix, 2 turn)

tools helix: 2:30 hrs and 130000thetraedros
segment aprox : 0:02 hrs and 7000 thetraedros, with the same radiation pattern and the same impedance.

#### abhi_kolkata

##### Member level 5
hi,

but i don't know how to assign, say, 16 segments per helical turn in hfss.

could u kindly tell me how to do that.

with regards
abhi

#### danteh

##### Newbie level 2
there two ways of doing it:

1) to create 16 square cross sections (without rotation) per turn and later to join the surfaces with 'unite' tool. select 'rectangle1' , 'rectangle2' apply 'unite', select 'rectangle2_1' , 'rectangle3' apply 'unite', etc.
The result is linear segments with square section with a helix shape. The position of the n-cross section is:
xn: r cos (Φn) r: radius helix Φn: 0, pi/8 , pi /4 , ......
yn: r sin (Φn)
zn: n*pitch/16 pitch: height per turn

2) to create 1 square cross sections and create a Line with segments (xn,yn,zn) and later use tool 'swep along path' to generate all the helix at once.

regards, Dante from (Instituto Argentino de Radioastronomia)

#### Twinkal

##### Newbie level 3
i m phasing the problem to design helical antenna for 12GHz.may be due to some problem of calculating pitch. so pls will u tell me how to calculate?

#### tallface65

##### Full Member level 6
Update to HFSS13...it handles these geometries very well!

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