145 MHz+ 435 MHz Antenna

[Admin 2421]

 

So gathered this antenna 145{144-146}+435{432-435} MHz type for rest. The model of the antenna

[Andrew77 6]

How would you simulate this antenna?

This is a collinear 144 + 430 

[Admin 2421]

Hi bro...!!!!

I think I need more constructive details...!!!

What kind of coaxial cable is used ... ???

Sleeves,what material is it?

From where did you get this drawing...???

[Andrew77 6]

Hi!

this is the antenna, 

http://vk2zoi.com/articles/dual-band-high-gain-flower-pot/

RG58, sleeve is a copper/aluminium  or brass tube

How you would simulate the 7 turns of coaxial cable?

thanks

 

 

[Admin 2421]

,,,you make the copper wire spiral and then you extrude the faces in succession(with different materials and thicknesses)...!!!

,,,but the antenna looks great at 2.5m...!!!

[Admin 2421]

,,,aha,this it"s the sleeve flower pot, with UV protected PVC tape or heatshrink...!!!

 

,,,and the coils...

 

 

,,,the other...

[Admin 2421]

,,,RG58U Low Loss Coaxial Cable

[Andrew77 6]

ook thanks,

will CST simulate well a coaxial cable with transient analysis ?

[Admin 2421]

In contrast to frequency domain tools, a transient solver’s performance can be degraded if the frequency range is chosen to be too small (the opposite is usually true for frequency domain solvers),,,,then  transient analysis ...!!!!

[Andrew77 6]

under simulation...

Need time....

Dual_BandHigh_Gain_Flower_Pot.cst

[Admin 2421]

,,,good work, but it's still to work....!!!!

[Andrew77 6]

Yes,

I fix it;

5,5M  Meshcells,  lot of time to simulate...

[Andrew77 6]

dual-band-half-wave-flower-pot

The simpler version,

Looks like to have the higher gain @410 MHz VS  430 MHz

Dual_Band_Flower_Pot.cst

[Admin 2421]

Well, but this antenna is not in reality ... the coaxial cable comes inside the tube...!!!

[Andrew77 6]

yes 

must be so, the coaxial cable is inside a pvc 25mm conduit tube, anyway its effects are very low 

 

Edited August 1, 2019 by Andrew77

[Admin 2421]

I don't think so, however, it is important for the coaxial cable to be on the center of the spiral.
still try ...!!

[Andrew77 6]

Ah!

OK, I thought the spiral worked as a choke only...

I will try

[Andrew77 6]

,,,under simulation the real antenna...

Dual_Band_Flower_Pot_2.cst

[Andrew77 6]

Seems that VSWR and gain go to the opposite direction!

[Andrew77 6]

On 10/4/2016 at 7:52 PM, Admin said:

 

So gathered this antenna 145{144-146}+435{432-435} MHz type for rest. The model of the antenna

could you post the .cst file for this antenna?

thanks

[Admin 2421]

I don't have this file anymore, but let's see what can be done...!!!

yah,this it is..

145+435mhz.cst

[Andrew77 6]

OOK thanks!