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Recent content by cyai

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    TDR measurement and Theory

    tdr theory Can anybody share some materials of TDR measurement or theory ?
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    The difference between Digital IQ and Analog IQ signals

    understanding iq signals Hi, all Currently I have one question regarding of digital I/Q and Analog I/Q signal. As we know, the analog I/Q traces connect from baseband IC to transceiver IC for providing modulation signals. And the layout should be keeping a complete ground area for I/Q trace...
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    How to view the time domain response using CST EM tool

    Hi, all I know CST is able to simulate base on time and frequency domain. Can anybody tell me how to set to see the time-domain response, for example using the simple 2-port microstrip line.
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    SAW filter simulation

    Hi, all Currently I have a 464MHz SAW filter need to implement my design board, but I found the impedance matching is very difficult because its high impedance of more than 800 Ohm. So that I want to use simulation tool to do the preliminary circuit matching. PS: I got the S-parameters file...
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    Power Amplifier measurement

    I got a power amplifier sample, but I want to measure the PA characteristics What test items shall I need to note that ? And how shall I measure these items? thanks,
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    SAW filter frequency response verify

    Hi, all Recently I have a project that use two SAW filters in RF board, but I want to know impedance matching of these filters. How do I verify that ? Thanks,
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    Dielectric constant calculation

    I forgot to adding another parameter, how about "loss tangent"? thanks in advance.
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    Dielectric constant calculation

    Hi, everybody We know an antenna built-in a plastic housing, the resonant frequency will be shifted to lower band. For building simulation model, we shall create a housing mode into the antenna model. My question is, if we take a housing, but we don't know the dielectric constant of this...
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    microstrip line transfer to CPW structure

    Hi, everybody Who can tell me if conventional microstrip line structure transfer to CPW structure? Thanks in advance.
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    about antenna bandwidth

    Could you tell us which antenna configuration that you design, the antenna size of 40*20mm2 is so big that can't meet wireless product space. As my experiences, using quarter wavelength antenna, such as PIFA or monopole antenna, the bandwidth is of more than 150MHz with fine tuning.
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    How to compare smith chart plotted on the same diagram in CST MWS?

    Hi, everybody, I found smith chart file has S11 amplitude/phase on CST software, if I want to compare with simulated/measured smith chart plotted on the same diagram, how shall I do? Thanks in advance.
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    WiMAX antenna specification concerning radiation patterns

    Hi, everybody Now I am studying printed antenna for WiMAX applications, could you please provide related design imforation /specification on radiation patterns requirements to me ? Thanks in advance.
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    Problem with RFID antenna design

    RFID antenna problem Now I have a antenna problem on RFID antenna; If I want to design 4 antennas printed on a 85*55 mm2 PCB board. Two antennas are operated at 915MHz, the other are design at 2.4GHz. How shall I do this design? Shall I use loop antenna or PIFA ?? someone can give me some...
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    Question about CST and Sonnet

    Could anyone tell me that CST is similar to Sonnet, they also are EM simuatlion software? If no, what functions could Sonnet provide us?
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    How to determine the size of an air box in HFSS?

    Re: HFSS AIR BOX PROBLEM In typically, we set the air box size to be near quarter-wavelength, then use the funcation, PML, optimize the better box size. But remember, the solution frequency shall be near the wanted frequency.
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