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Recent content by geppei

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    RF amplifier problem, resonant? ET? equipment problem?

    figure 3
  2. G

    RF amplifier problem, resonant? ET? equipment problem?

    figure 2
  3. G

    RF amplifier problem, resonant? ET? equipment problem?

    Hi everyone, I am doing a 3.8G low power pre-amp which also bandstop 900M,1.8M and 5.8M everything is ok when using a network analyzer to check. Figure 1 (power = -10dBm), 15dB gain at 3.8G and there is already back off from P1dB However, once i use Signal generator + spectrum analzyer to...
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    measure/test problem?

    Would it be possible to connect a semi-rigid on the feeding port of the PIFA? Then, take measurement for the return loss/BW through the network analyzer and perform radiation pattern test in chamber?? P.S. It would be better to include the casing of the product while measurement was taken...
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    Need help for DECT antenna design.

    For DECT handset apllication: L-shaped/ helix/ Inverted-F For DECT BS application: PIFA/ Planar patch/ Inverted-F Most of the time, BS will install 2 antenna for different polarization to compensate each other. They are controlled by a switching algorithm "antenna diversity". For HS, only 1...
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    help !!! increase the bandwith of mirostrip antenna

    simply increase the height of dielectric or use a couple feed
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    How to measure the gain of an antenna in an anheonic chamber?

    how to measure gain 2 method : 1. use a standard Horn antenna to check the TX powe.Since the spec of the horn will mention about its gain vs frequency. Say, you got -32dBm by using a horn to transmit And the horn has 8dBi gain. So, by simple calculation, the 0dBi is expected if your DUT...
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    Explanation and references about the RFID

    What is the RFID? 2000m range needs very larger TX power. I can say TX power may exceed 50dBm which is similar to a GSM TX tower
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    What material will absorb 900MHz, 2.4G, 5.8G RF frequencies?

    Anyone knows about the ISM band ? 900MHz, 2.4G, 5.8G Any materials will absorb those frequency ?
  10. G

    how big should the air be drawn in HSFF antenna simulation

    thanks all!
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    how big should the air be drawn in HSFF antenna simulation

    I am always confused that the size of the air "box" in HSFF antenna simulation. I have tried different size of air "box" and they resulted in different simulation results. Anyone could suggest some guidelines in this issue? Thanks a lot
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    how to draw triangle in HFSS?

    hfss equation based surface Could anybody know it? Thx
  13. G

    monopole PCB antenna, HELP needed

    monopole lenght is nearly independent with PCB thickness, because the printed monopole should not be put above the ground plane. Just a question to ask, is your antenna above ground plate?
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    anyone knows how to design a monopole antenna? HELP!!

    beside using a wire monopole, you can design a printed monopole on the PCB.
  15. G

    HFSS, object contacting = unite?

    it seems that it is different! i have drawn 2 objects to construct an antenna eg. L antenna the verticle part and horizontal part it seems that the effect to combine the 2 parts (unite) is different from just contacting 2 parts is it?
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