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  1. E

    Different Ant Impedance simulated CST & HFSS

    I agree, but HFSS has predicted real results in the past and number of times but am not sure about CST.
  2. E

    vertical and horizontal induced measurements

    Thanks for your comment Biff44 - unfortunately the antenna can not be modified. But the problem got sorted out.
  3. E

    Different Ant Impedance simulated CST & HFSS

    Hi all, I am simulating a similar design in HFSS and CST (TD) but getting different impedance. Any suggestions why ? which one would be more close to the real one? Thanks
  4. E

    vertical and horizontal induced measurements

    Thank you everyone for your help and suggestions. So the problem got rectified using few precautions 1. Placing the feeding wire/line underneath the group plane. 2. Connecting the antenna ground to the measurement setup ground ( there was a large ground plane on which the antenna was placed)...
  5. E

    vertical and horizontal induced measurements

    Thanks for replying guys. FvM: I do not have ferrite but can make arrangements to place the wires under the ground plane. BMR: Unfortunately, the casing is required. Volker: there are definitly reflections but I tested a wired monopole - the results were fine, so I am expecting atleast that...
  6. E

    vertical and horizontal induced measurements

    It is a monopole antenna made up of measuring tape with a pin at one end which is epoxied (conductive) to a sma connector feed by an RG58 cable through a signal generator. The antenna is mounted on a plastic housing and kept on a 1m diameter ground plane. I did get reflections from the wire -...
  7. E

    vertical and horizontal induced measurements

    Hi, I am trying to measure vertical and horizontal induced voltages of a monopole antenna made out of a measuring tape. Since the antenna is vertically polarized there should be at least 10dB difference but at times it is not - any advise what i might be doing wrong? Thanks in advance
  8. E

    complex port Impedance Genesys

    Hi, Can anyone please advise how to define complex input port impedance in Genesys 2014.03? Thanks
  9. E

    Reflection-less matching for antennas?

    There are many scenarios where you have to make sure that there are no reflections for instance generating few watts gets expensive as the frequency goes up so you do not want to waste that power by reflections or in radars these reflection might end up at the receiver causing false alarms, or...
  10. E

    Reflection-less matching for antennas?

    Thank you for the reference - got the point that they look at the matching from different perspective but the matching condition remains the same that is real part(i) = real part(j) and reactive (i) = reactive * (j) - to be conjugate of the other . So for an antenna "It is a well-known fact...
  11. E

    Reflection-less matching for antennas?

    Hi all, We know that for maximum power transfer Zs = ZL* , this is known as maximum power transfer matching. But there is this reflection less matching which says Zs = ZL. Now if the Z has reactive part then there would be a difference. In antenna feed matching network design which method...
  12. E

    HFSS Impedance determination

    Hi all, I am simulating a pretty simple monopole antenna and aground plane place after a gap. I have simulated the results with waveport and lumped port - got VSWR = 1.6, and required gain patterns but when I check the Z11 - real and imaginary , I get around 0+5j. What have I done wrong? I...
  13. E

    HFSS Z parameter anomaly

    Hi all, I am simulating a pretty simple monopole antenna and aground plane place after a gap. I have simulated the results with waveport and lumped port - got VSWR = 1.6, and required gain patterns but when I check the Z11 - real and imaginary , I get around 0+5j. What have I done wrong? I...
  14. E

    rectangular array antenna 2x8

    You define the magnitude and phase of the excitation of each port through Edit Sources.
  15. E

    Design Monopole feed in HFSS

    hi, I am trying to design a monopole with a ground plane next to it. Could anyone please advise which would be the best position to place the lumped port? the feed pin (in the direction of fed current) or the gap between the ground and the pin? The port in between would not reflect the actual...
  16. E

    Digital Oscilloscope to view high frequency signal

    Hi, I read your reply in one of the posts and thought you might be able to help me. I am using Keysight 2.5GHz oscilloscope to view a 121.5MHz signal across a 15pF capacitor. The data sheet says it should be a square wave but I am getting a sine wave of 121.5MHz. The probe bandwidth is 500Mhz...
  17. E

    HFSS IE hybrid design

    Hi all, I am trying to build a hybrid (FEm and IE) HFSS design. If I were to define IE region for my patch antenna (having three layers, Patch, dielectric and gnd layer). How do I do that? I tried assigning IE region separately to each layer but get an error. What about IE region -...
  18. E

    converting hfss file to gerber file

    Use Sonnect or GC Prevue
  19. E

    Radiation conversion basics

    Hi, I have measured radiation patterns of an antenna and got Az, EL and rEtotal magnitude and angle. I want to now convert these into gain plots. What is the relation between the above and gain to be plotted in matlab? is rEtheta = ReTotal cos angle? and rEphi = ReTotal sin angle? Where can...
  20. E

    Help reagraing OSLO- lens for diverging strobe 12 to 50deg

    Re: Help reagraing OSLO CAn anybody help me with OSlo?

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