Split design/simulation/optimization in two?

Hello to you all,

I have during the last few week been working on an slot antenna design with a microstrip feed, center feed with an openended quarter wavelength stub. I have worked a bit backwards, I modeled an existing design I found in a box at work and tried to optimize that. This existing design is not good (S11 min -4.5 dB in 2-3 GHz).

In the middle of this work I started to ask myself if it would be possible to split the work into two parts. First optimize only the slot in a ground plane and when I'm happy with the resulting resonace frequency and bandwidth, then I worry about the feed (will be feed via an offset stripline with a ground pin at the slot).

Is it even possible to feed a slot with a HFSS port of some sort and make it act as a "perfect" feed?
How do you otherwise work to simplify the modeling/design/optimization?

Best Regards
Joakim, Sweden

Hi Joakim,

I am also working on a triple slot fed GSM band slot antenna. I am doing this by hand with copper tape and a PCB prototype milling machine. To speed u I am using microwave office to simulate. If I were you I would also look at the smith chart to see where you are at with impedance and capatance. Just rember wider slot more bandwidth, thiner feed more inductance wider feed more capatance. The triple slot is more difficult since each of the 3 feeds can tune or detune the other.

Ron Mountain View CA.