Warnings in CST Studio

[RomanWorkshop 10]

When simulating my antenna in CST Studio 2019 I get these messages:

1. "Defined reference frequency for open boundary condition (2.442 GHz) is larger than the lowest relevant system frequency (monitor at 2 GHz).
Please check open boundary settings to ensure accurate monitor results for the lowest frequency of interest."

2. "1037 mesh edges are represented in staircase mode and have been filled with PEC.
3533 mesh edges are partially filled with PEC."

What should I do?

[Admin 2546]

,,where did you get these messages ... ??

,,,for 2,442GHz -broadband field monitors=>fmin=1,942GHz; fmax=2,942GHz

,,,show image or put the cst*file here ... !!! 

[RomanWorkshop 10]

In my design of this BowTie antenna. Maybe you can correct it, add a reflector and simulate the results

BowTie.cst

[clanon 247]

3 hours ago, RomanWorkshop said:

1. "Defined reference frequency for open boundary condition (2.442 GHz) is larger than the lowest relevant system frequency (monitor at 2 GHz).

it means that the FRECUENCY range choosed is too small , set it from 2  to 3 ghz

the PEC thing doesn't matter much...is the MESH or check for INTERSECTIONS (interferences between solids)

Edited December 29, 2020 by clanon

[Admin 2546]

,,,the antenna I think works well, but I think the design is not very good...

 

[RomanWorkshop 10]

1 hour ago, clanon said:

it means that the FRECUENCY range choosed is too small , set it from 2  to 3 ghz

I already had this frequency set from 2 to 3 GHz, I also tried change it from 0-5 GHz, but warning message is still displayed.

Well, it's my first design. How to automatic position of port between these cylindrical elements?

[RomanWorkshop 10]

After change frequency range and farfields to 1.942-2.942 GHz warning message is not showing.

[clanon 247]

30 minutes ago, RomanWorkshop said:

How to automatic position of port between these cylindrical elements?

W  key and double click (align WCS) at the right point and angle. then make that distance the port length (a little more does not harm) SELECT port on the left panel and TRANSLATE (rotate) etc

Edited December 29, 2020 by clanon

[Admin 2546]

,,, there is still work to be done on this antenna...

 

BowTie.cst

[RomanWorkshop 10]

I added reflector (170x244mm, Steel-1008, 1mm thickness) with space between it and vibrators h=8mm. Now it is quite good antenna for 2.3 GHz I must change dimensions of elements and maybe it will work for Wifi 2.4 GHz.

The impedance chart is interesting; by changing "h" space between reflector and vibrators, impedance was drop to 53 Ohms. So does antenna not require any impedance matching now and can be connected directly with a coaxial cable?

[clanon 247]

it's a BALANCED antenna (symmetrical HALFs) it NEEDs a balun 1:1 if you're close to 50 ohms

and 4:1 if you get close to 200ohms

Edited December 30, 2020 by clanon

[Noradavis 0]

Warning in CST microwave studio while simulating Microstrip Patch Antenna? I am getting a warning while viewing the far field pattern of the antenna ...I always face with this warning in CST for unitcell structures: "The input reflection of the S-parameters seems  counter  to be large at . "Defined reference frequency for open boundary condition (2.442 GHz) is larger than the lowest relevant system frequency (monitor at 2 GHz).It simplifies the process of creating the structure by providing a powerful graphical solid modeling front end which is based on the ACIS modeling kernel warning message. CST MICROWAVE STUDIO - Partial RLC Solver • Fixed erroneous RLC computation in second simulation run. CST CABLE STUDIO • Dielectric shapes are ...

[Admin 2546]

,Noradavis,post a CST file with such problems..!!!