Type: Posts; User: streamlet

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  1. Replies

    [SOLVED]Closed: Re: [HFSS] MagE and CmplxE

    Hi, but then the CmplxMag result should be identical to at least one MagE result, but this is not the case ?!

    It is. Taking a rectangular cavity resonator working at TE101 mode and...
  2. Replies

    Closed: Re: RFID Coil design and Simulation

    Freespace wavelength at 390 MHz is 77 cm. I guess you are talking about coils for near-field applications.

    Both ADS Momentum and HFSS can help for the coil design, though the former should be...
  3. Closed: Re: How i can applied a lumped port on coaxial cable at HFSS?

    Could you clarify where the circular sheet (to which the lumped port is assigned) is placed with respect to the patch-antenna structure?

    - - - Updated - - -

    Wave port can also be used in a...
  4. Replies

    Closed: Re: Eigen mode solver of HFSS

    I don't think you can evaluate the coupling between two resonators using the eigenmode solution type. You need to switch to driven mode and check parameters which characterize the coupling effect...
  5. Closed: Re: What is the difference between "design variable" and "project variable" in HFSS

    Correct. The project variable is especially useful if you want to study the influence of material parameters (e.g., dielectric constant).
  6. Replies

    Closed: Re: HFSS Wave vs. Lumped ports at Ku band

    The modeling of microstrip lines in HFSS indeed has many alternatives. There might not be a silver-bullet solution. The usefulness of the simulation has to be checked with analytical calculation...
  7. Replies

    [SOLVED]Closed: Re: [HFSS] MagE and CmplxE

    This answer is not clear. It is better to look at their definitions:
    Mag_E is defined as Mag(AtPhase(Smooth<Ex, Ey, Ez>, Phase))
    ComplexMag_E is defined as Mag(CmplxMag(Smooth<Ex, Ey, Ez>)) or...
  8. Closed: Re: Boundary 'PerfectE1' and boundary 'Rad2' overlap

    In get rid of this warning, you can assign Rad boundary to all surfaces of the air box except for the surface corresponding to the ground plane.
  9. Replies

    Closed: Re: RFID and distance measurement

    If you just want to know whether the item is placed on the correct position on the shelf, maybe you don't need to evoke RSSI. I have little experience with LF RFID systems, so I try to explain with...
  10. Replies

    Closed: Re: RFID and distance measurement

    Theoretically yes, but quite difficult in practice, if you solely depend on RFID without using any additional sensor (e.g. ultrasonic sensor mentioned by throwaway18).

    Considering the close...
  11. Closed: Re: coax waveport size and airbox size for microstrip patch antenna in HFSS

    The coax dimension is required to deliver a characteristic impedance of 50 ohm. Refer to the characteristic-impedance formula of the coax.
  12. Replies

    Closed: Re: where i can buy RFID chip?

    Alien itself sells Higgs-4 in two package-types: flip-chip and SOT. The former is more compact, however it requires ACP for bonding. The latter is more friendly for prototyping since it can be...
  13. Closed: Re: Location of probe for CP patch antenna with truncated corners

    There are discussions in C.A. Balanis' classic antenna book, as I can remember. As a rule of thumb, try different feed locations along the middle line of the patch. A feed location at the patch edge...
  14. Closed: Re: How To Plot E-Field and H-Field Correctly in HFSS?

    For circularly-polarized antennas, there is no such things as E-plane and H-plane, since the E-field is rotating!
  15. Closed: Re: Graphics field E as a function of distance in HFSS

    You can create a polyline in HFSS, and then generate a E-field plot along this polyline.
  16. Replies

    Closed: Re: Solution for two frequencies in HFSS

    This is an interesting feature. Do u mean EMPro?
  17. Replies

    Closed: Re: HFSS inductor simulation

    If u need to fully characterize the inductor by solving its 2-port S parameter, this is the only way.
  18. Closed: Re: [Newbie Pls Help!] Difference in Resonant Frequency Measured in S11 and Imped Plo

    In default, the minimum on the S11 plot indicates the best matching point with respect to 50 ohms. Note that S11=20*log10|(Z-50)/(Z+50)|, so S11 is a function of both the imaginary part and the real...
  19. Replies

    Closed: Re: lumped port for different structure

    Using lumped ports is the easiest way to define excitation in HFSS. Just create a rectangle at the feeding gap and then assign a lumped port on it.
  20. Replies

    Closed: Re: HFSS Antenna Impedance Source or Load?

    It does not matter whether u treat your loop antenna as the source or the load with respect to the impedance matching task, though your loop antenna looks more like the source since it is used as the...
  21. Closed: Re: Standalone miniature Monopole or Dipole antenna. How to know what is what?

    No detail of the feeding part can be seen on the picture. My best guess is that the left long trace works like a monopole, while the right short conductor serves as the ground. This guess is made due...
  22. Closed: Re: Want to know how to integrate an RFID tag with a GPS module

    GPS and RFID are different technologies and follow different protocols. In order to achieve your goal, basically u need to combine one GPS module with one active RFID tag.
  23. Closed: Problems of HFSS optimization - Bandwidth evaluation and step of geometry variables

    There are two questions here:
    1) We know that it is easy to determine the 10-dB bandwidth by using the XWidthAtYVal(-10) function in the simulated return-loss plot. Thus when I try to achieve a...
  24. Closed: Re: simulator for simulating RFID localization and speed estimation

    RFID localization and speed estimation? It involves many techniques. There is no easy answer. However, when talking about modeling the whole RFID system, matlab and ADS can be used.
  25. Closed: Re: difference between wave port and lumped port in HFSS

    According to my experience, the lumped port is more easy to use, and its accuracy is good compared with the measurement (at least for the UHF band).
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