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Recent content by Salving

  1. S

    Patch antenna for 2.5-2.7 GHz range.

    Thanks everyone
  2. S

    Patch antenna for 2.5-2.7 GHz range.

    I've already tried this, but i could not get two resonances close enough. Got good results only with thick substrate about 7-8 mm
  3. S

    Patch antenna for 2.5-2.7 GHz range.

    Hello everybody. I'm designing a patch antenna for 2.5 - 2.7 GHz range using fr-4 substrate with thickness less then 3.2 mm. So far I haven't done with bandwidth more than 4-5%. Maybe someone could help me to find papers or whatever. Any help would be great
  4. S

    Power used in microstrip patch antennas

    Thank you very much. But where'd you get that information? Is it from your experience?
  5. S

    Power used in microstrip patch antennas

    I need to know if I can use 150 W of power (to transmit) in patch at freq 4.6 GHz
  6. S

    Power used in microstrip patch antennas

    Thanks all of you, but how do I determine the max current that may be used in patch antenna, what are factors it depends on?
  7. S

    Power used in microstrip patch antennas

    Hello, everybody. Can anyone tell me what amount of power may be used in patch antennas and what factors need to be taken into account when calculating forementioned power.
  8. S

    Back-to-back simulation of waveguide to microtsrip

    Unfortunately I can't post a pic.. The structure contains of two striplines connected between each other with simple microstrip line, everything on the same substrate with no baluns.Herу are results before increasing the length
  9. S

    Small loss level in microstrip line at 60 Ghz

    I've designed simple microstrip line on rogers 4003 substrate (extrapolation tan delta = 0.0062 @ 60 GHz) in freq. band of 60 Ghz. CST showed small loss level of about 0.1 - 0.2 dB for 10 mm line. I tried to increase meshing but it didn't help. What could be the reason of that small loss level?
  10. S

    Back-to-back simulation of waveguide to microtsrip

    It doesn't help, but thanks anyway
  11. S

    Back-to-back simulation of waveguide to microtsrip

    Hello everybody. I have designed a waveguide to microstrip transition for 60 GHz (using CST) that shows very good matching, when the length of PCB component (microstrip line) does not exceed 5-7 mm. If i increase this length the parameter S11 starts to oscillate as you can see on picture. Is...
  12. S

    Defining tan delta from measurments

    Hello everybody. Can anybody tell me how to define tan delta of dielectric substrate from measured S21-parameter of microstrip line?
  13. S

    Rogers 4003c substrate losses 50-70 Ghz

    Thanks to all of you, i was interested of finding out loss tangent, but now i gotta measure one
  14. S

    Rogers 4003c substrate losses 50-70 Ghz

    Hello everybody, could anyone give me an information about losses in rogers 4003c at frequency range 50-70 Ghz?
  15. S

    Slot antenna literature

    Hi, everyone. Can anyone suggest any literature on slot antennas. I'm designing slot antenna with ground plane reflector (to get unidirectional pattern and high gain) and need physical interpretation for simulated results, cause the gain of my system increased by 4 times, not by 2 as i thought...
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