Vivaldi Antenna, Simulation and Meaturment results,

eirp said:

Here results calculated by MWS.
The energy has settled down to -40dB.

What port you used in physical realisation? Coaxial to strip transition?

Cheers

eirp

PS: I had to slightly modify the port region by adding small strip feeder. However this won't affect the results a lot.

PPS to gregb3d:

In MWS you can simply create analytical curves using VBA macros accessible from MWS GUI. I don't know if HFSS has also such tool, but it's very practical

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KMPA said:

Hi to all,
I designed a Vivaldi antenna with taper rate of { exp(0.15*z) } in the 500-2500MHz frequency range on RO4003 substrate with Er=3.38 ( Fig.1). The simulation results (Fig.2 and Fig.3) that carried out with Ansoft HFSS V9.1 estimate very good performance (VSWR < 1.6:1 ). but when I construct this antenna and measured input VSWR of it, I saw that VSWR is greater that 3:1 ?? (Fig.4 and Fig.5). I simulate this structure by assuming construction tolorances but simulation results didn't change. I beleave that port definition is wrong.
I upload my structure .sat file, Can anybody simulate this antenna with other softwares (CST or IE3D or ...)

Thanks in advance
KMPA

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