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  1. Heissenberg

    Dual- Frequency Patch with circular polarization

    I am following at the moment the attached paper, but now I have another problem. With the two probes with 90º phase, I achieve perfect circular polarization and enough gain, but the Reflection Coeficient is not enough (less than -7db). With the new design, gain and RC are very good, but I can...
  2. Heissenberg

    Dual- Frequency Patch with circular polarization

    Hi again, thank you for your help first of all. I was making some tests during this months, but the results were not as better as I expected. So, I would like to make my question again, but with another words. What would you recomend me to do, to achive a Circular Polarized patch antenna...
  3. Heissenberg

    Dual- Frequency Patch with circular polarization

    Thank you for your answers. During this time I was testing with the size that higgler proposed me. The size of the patch it´s ok, but the ground distance is too big, so I am using different distances, about 10mm from the substrate.
  4. Heissenberg

    Dual- Frequency Patch with circular polarization

    Sorry for the mistake! Here is the image :) http://files.engineering.com/getfile.aspx?folder=ef6062fc-6262-4fc4-ad98-d1372c1fc5e9&file=antenna.jpeg
  5. Heissenberg

    Dual- Frequency Patch with circular polarization

    Today I have been testing with your suggestion, but I didn't obtain too much good results. I am sure that I am doing something wrong. In spite of the fact of I obtained bad results, I could notice that you were right respect to bandwith. I have upload a photo of the antenna that I am using. I am...
  6. Heissenberg

    Dual- Frequency Patch with circular polarization

    Thank you Higgler for your help, I will try it during this week! I was following the attached pdf, because I need good S11 values for this two frequencies and to keep circular polarization...
  7. Heissenberg

    Dual- Frequency Patch with circular polarization

    Hi everybody! I am a little bit new in antenna fabrication. In this moment I am trying to build a new antenna for two different frequencys(868 MHz and 917 Mhz) for some utilities. I was looking for some desgins, but I only have been reached good behaviour in 868 MHz. I have been using a square...

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