Hello everyone,
I am currently working on Rectangular Patch Antenna when fed with Proximity coupling. When I have simulated it in HFSS with a resonant frequency of 9.8 Ghz, I was able to obtain a return loss of -37.357dB and VSWR of 0.230 at 14.1Ghz. Attached is the image for your kind reference. Please let me know how to shift the frequency from 14.1 to 10 Ghz(approx.)
I have tried in reducing the patch width as well as patch length but beyond certain value, I am getting a warning in HFSS stating that "Poor convergence in computing port dispersion hfss"
Thanks for taking time in helping me.
Hope to hear from you soon.
Yours sincerely,
Pavan Kumar Akula.
Hi, Akula.
You have good idea, patch length have influence on resonant frequency but to shift down the resonant frequency, you must increase inductance and to increase inductance must increase the patch length.
When change length of patch (increase or decrease) the port of antenna must be redesign to keep on match.
With my best regards.
Dear Praveen,
You just increase the patch length to shift resonant frequency towards left side and decrease the patch length to shift resonant frequency towards right side. Basically, the patch width effects on bandwidth but not on resonant frequency.
Here, you want to change total resonant frequency, so all dimensions of your antenna along with substrate will also change. Design the antenna having dimensions suitable at 9.8GHz.
Dear Pravan
Actually resonant frequency are function of Lengnt, relative permitivity and the substrate height but as you want to shift the resonant frequency without changing the above parameters, you can try introducing different slots in your design which would results in fringing effect and as a result there would be a shift in the resonant frequency.
With regards Dhanu Chettri.
Resonance frequency is dependent on length (and not width). As Mr Dhanu rightly said the factors. If you want to use same substrate material, only remain is length. Increase of length will reduce the resonance frequency provided it is matched with input source impedance.
you got to play with the the length of the patch or better still use the antenna equations and recalculate for the resonance frequency
another way to do this is to lower the dielectric constant to increase thye frequency
how we can find resonant frequency of RF MEMS varactor in CST?@solomonmingle
- Pavan Kumar Akula
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