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  1. J

    [SOLVED] Appnote: The emModel view in ADS Momentum

    Thank you very much! @volker@muehlhaus
  2. J

    MMWAVE Layout and EM Simulation

    Please refer to the help documents.
  3. J

    what's the best way to hook up VNA to PCB?

    Suggest to use the pigtail. https://rflabsinc.com/Products/Cable_Assemblies/Tuning_Pigtails/2015/0915/55.html
  4. J

    HFSS Learning tutorial

    Google HFSS Full Book or just the HFSS Help!
  5. J

    True Large Signal Differential Input Impedance Evaluation

    Refer to the book of HANDBOOK OF MICROWAVE COMPONENT MEASUREMENTS WITH ADVANCED VNA TECHNIQUES 8.6 Distortion Measurements of Differential Devices 539 8.6.1 Comparing Single Ended IMD Measurement to True Mode Measurements
  6. J

    Could anyone please help me confirm the Simulation results of ADS2016?

    Hi,volker@muehlhaus, thank you very much for your response. Following your valuable suggestion, I got the correct results. The mistakes are made for the port setting in the simulation. Because this is a finite GND, the pin+ should reference to the explict reference pin-. Yes, I want to check...
  7. J

    True Large Signal Differential Input Impedance Evaluation

    For True Large Signal Differential Input Impedance Evaluation, we must use the true differential mode and the VNA must support true differential mode, that is to say, every port of VNA must have its own VSG and VSA...
  8. J

    Could anyone please help me confirm the Simulation results of ADS2016?

    Dear All, I want to use ADS2016 from Keysight to Co-Simulate the PCB layout with RLC. But for the first step, I found the layout simulation results were not believable. The real part of the impedance of the pad directly connected to the GND plane seems to be too large, is about 27.8Ω...
  9. J

    Thickness of FR-4 substrate

    Bad idea. 1. u could not get the exact valune of the dielectric constant of FR4 at 33GHz. 2. At 33GHz, loss tangent of FR4 is very large.
  10. J

    How we can make EM co-simulation of circuit

    Please reffer to the ADS cookbook, there are examples.
  11. J

    How to stable the PLL over wide temperature range(-40~85℃)

    Yes, I have read this. This method is used when the device has started up, and when the temperature changes, we need do the VCO auto-selection and coarse tuning. But when I start the device at -40℃, the file dose not tell us. So maybe we should use the method as you discussed, using a...
  12. J

    How to stable the PLL over wide temperature range(-40~85℃)

    Integrated, not discrete. - - - Updated - - - The VCO I used is RFFC2071. Yes, I should not focus on the stablity of the PLL which has a closed loop to fit the frequency. Because, I want the VCO to operated at one exact frequency point, I should give the configuration to the VCO. The...
  13. J

    How to stable the PLL over wide temperature range(-40~85℃)

    I want to design a PLL operating over wide temperature range:-40~85℃. The key is to design the VCO operating over wide temperature range:-40~85℃. I used a TCXO for VCO reference frequency. Then how to make sure VCO is operating over wide temperature range:-40~85℃. For the VCO calibration, I...
  14. J

    array antenna with right-hand and left hand circular polarization

    Microstrip Antenna Design Handbook,Ramesh Garg, Chapter 12. Antenna Theory: Analysis and Design, Balanis,Chapter 6. - - - Updated - - - Antenna Theory and Microstrip Antennas, D.G. Fang, Chapter 3 and 6. In Chapter 6, there are: 6.3 Design of Power Divider and Transmission on the...
  15. J

    array antenna with right-hand and left hand circular polarization

    First the element should be right-hand or left-hand circular polarization. Then design the feeding network for the array. You could follow the example in the antenna books or papers.
  16. J

    How to Start the Linux learning?

    Hi, srizbf, thank you very much for your valuable web links. - - - Updated - - - Yes, your suggestion is very useful for my starting. For the starting point, I need not to get too much about Linux kernel. Just read the device driver example source code and get to how to code the first device...
  17. J

    How to Start the Linux learning?

    Dear all, I am an antenna and RF circuilt enginneer. For the common work, I find the Linux is also very important for me. I have some basic knowledge of C language. Could anyone introduce me any web links or how to start the Linux learning? In my work, I designed the antenna and wireless...
  18. J

    Enhancement bandwidth of Microstrip Patch Antenna

    you could use the aperture coupled feed method and the multilayer method, and the bandwidth could reach 20%.
  19. J

    How to model bias network accurately?

    Do the Co-simulation with your PCB and DC bias layout 3D simulation.
  20. J

    Hi.i want to create a dipole antenna ie3d for 900MHz

    The example is operating at 10GHz. For your requirement, you should change the antennas size. The antenna is comrised of a shape, and the shape is comprised of several vertices. To change the antennas size, you should change the vertices.

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