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Type: Posts; User: spikeyang

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    Closed: helix antenna hfss simulation

    Look like a DNA double-helix structure. The problem is you used a infinitely thin , continuously bending face. It will make trouble for meshing.

    Better to use an object model. Rsing up in the...
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    Closed: Question about vout in circuit

    I agree only the negative part will pass.
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    Closed: how to select capacitor

    Capacitor is not working in conducted mode. So pay attention to rated voltage not current. It should be at least 2 times of the voltage apply to. Capacitor will lower down the voltage drop, but it...
  4. Closed: Cyrstal oscillator

    E-design is telling the truth. Rich harmonics = square wave shape.
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    Closed: Power supply control, how to work?

    In *1.jpg, the current flow from left side to the right. Q3 is a switch, Q4 is the control device.

    Are you sure Q3 is the right FET device? I think the arrow should be upside-down.

    You can...
  6. Closed: circuit reading?

    NTC, is negtive temparature component. The resistance is inverse to the temperature . When the temperature is low enough the first transistor will conduct and trigger the second conductor to power...
  7. Closed: parameter in PA

    1)For PA forward isolation, it means when the PA is shutdown (no power supply), the power coupled from input to output. It's used in GSM handset power amplifier module filed.
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    Closed: embedded systems with wireless robotics

    I like to see what it's going on. I know somthing about wireless.
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    Closed: Current Distribution on structure

    Hehe, field display
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    Closed: Why mismatch causes reflected waves

    Rudane's explanation is quite impressive.

    Boundary condition can explain the stabilized solution not what happened at the first second.
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    Closed: Re: Microstrip large to have 50 ohm

    He asks if the impedance of microstip line dont change with the length.
    Of course it's not.

    Dont mess it with serial resistors. It's different. The impedance means the ratio between Voltage and...
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    Closed: How to make solar cell at home ?

    You can find a document in "Hobby Circuits and Small Projects Problems
    " column.
    the name is "Homemade Solar Cells [Free Energy eBook].pdf"
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    Closed: What type of printer is better ?

    I think HP is good.
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    Closed: Cloud computing and antenna simulation

    I'm tired of waiting for HFSS to complete the simulation and shaking my mouse to see if the computer is not actually deadlocked. My computer hardware, CPU, Memory capacity can never meet the...
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    Closed: Re: Problem about excitation in HFSS

    You should cut the inner conductor cross face out. then define the wave port.
  16. Closed: Re: PIFA Design

    In practical design, the PIFA patch is mounted on a plastic structure.
  17. Closed: How can I make a plastic cover for my homemade equipment?

    That's very helpful!
  18. Closed: How can I make a plastic cover for my homemade equipment?

    Thanks.
    But can I make plastic gadgets?
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    Closed: whatchip download

    Yes. CSR 's mark.
  20. Closed: how to make plastic cover

    Is there some cheap way to make plastic parts I can do at home?
    A lot of people are making PCB etching at home. So I'm wondering whether cover can also be made. And what is the plastic-manufacturing...
  21. Closed: which will cover more distance: Low or high Freq. signal??

    Yes, low frequency travel further. But low frequency antenna is hard to make, antenna dimension reason.
  22. Closed: FM HELP

    You modulate an FM carrier with FSK signal.
    If the frequency shift rate and frequency deviation are too high, when it's out of the FM receiver tracking band( Maybe tens of kiloHerz), you wont...
  23. Closed: what's t-mobile??

    Yes, seems like the name of an europe operator.
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    Closed: usb 5v amps

    The rated power from USB port is 5V*0.5A = 2.5W ; What you want is 5V*2A = 10 W.

    You must obey the energy conservation law. You extract too much current from it, you burn the USB port.
  25. Closed: matlab analogue simulation

    I think the main problem is Matlab is like BASIC language, a explainative language. But spice is a compiled program, it must be much faster than Matlab.
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