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  1. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    Here is a fictitious example for illustration: Load impedance: 1 Ω + 2.55 nH
    Matching frequency: 500 MHz
    Source impedance: 2 Ω / 6 Ω / 20 Ω (selectable within certain limits)

    Matching made with...
  2. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    Very important: The constant load impedance only makes sense for one single frequency.
    For a matching circuit and/or a filter circuit, the load must be known broadband (or a resistor).
    Do you have...
  3. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    Give us some concrete values of your specifications. I can play with various tools. From very simple to very powerful.
  4. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    Here is an example for clarification:
    Known are: Z1 and Z6
    155358

    The impedance ZZ can be chosen arbitrarily (must have an ohmic component).
    Otherwise there are endless possibilities.
  5. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    Am I getting this right?
    Z1 is the load impedance, which will be connected to the right side of B
    Z2 is the input impedance of B (right side) and should be conjugate(Z1)
    For synthesizing block B...
  6. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    I dont know the tool "DA_LClowpassMatch" in ADS. But this is a classic textbook example. For only one frequency easy to solve using the Smithchart (graphical method)
    With 3 elements in the matching...
  7. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    You just want matching on one frequency? Which frequency?
    If no, you need a frequency-dependent load.
  8. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    Hello
    Give me some more infos
    What topology exactly do you want?
    Source and load impedance?
    Some specs?
  9. Closed: Re: problem: coupling coefficient for two hairpin resonators

    Input and output ports must be very weakly coupled to the resonators.
    See also examples in the book "Microstrip Filters for RF/Microwave" (Hong/Lancaster).

    154836
    154837
  10. Closed: Re: Recommend simulation software for RF simulation

    "Microwave Office" is a very good choice. I am a user of CAD tools since the beginnings of RF simulations (EEsof/Touchstone, Libra, Academy...) until today. The tool is very powerful and still has a...
  11. Closed: Re: Transfer function for a dual band pass filter (small task from network theory)

    Simple implementation of frequency dependent losses.
    146762
  12. Closed: Re: Transfer function for a dual band pass filter (small task from network theory)

    Many LC filters have large reflections in the "passband" without the user being aware of this. All phase-optimal filters (e.g. Bessel) have a monotonous increase in reflection in the "passband"...
  13. Closed: Re: Verification of a 3D simulation of a bandpass filter

    Thank you for the simulations! The results are not far from my simulations. If possible and allowed, please save the S-parameter file (Touchstone format xx.s2p), so I will summarize all curves in one...
  14. Closed: Re: Verification of a 3D simulation of a bandpass filter

    Thanks for trying. Now only the top layer in the Gerber file.
  15. Closed: Re: Verification of a 3D simulation of a bandpass filter

    Here are some more infos and a gerber file with the top-layer data. I know the problems of comparing measurements and simulations from my own experience. Nevertheless, I would be interested to know...
  16. Closed: Verification of a 3D simulation of a bandpass filter

    A classic bandpass filter (Microstrip Interdigital) was designed and optimized on the substrate RO4350B.
    The filter was checked with 3D simulations (CST).
    I would be very interested in verifying...
  17. Closed: Re: Transfer function for a dual band pass filter (small task from network theory)

    Finally someone mentions the connections between reflection and transmission in a lossless LC network. Of course this gives a great reflection... the power has to go somewhere. The user must decide...
  18. Closed: Re: Transfer function for a dual band pass filter (small task from network theory)

    Not quite right. It also works with a lossless LC network.
  19. Closed: Re: Transfer function for a dual band pass filter (small task from network theory)

    The specification is somewhat challenging so that a standard off-the-shelf solution is not simply possible (missing in most engineers' curricula). But the filter can also be realized with lossy...
  20. Closed: Re: Transfer function for a dual band pass filter (small task from network theory)

    This is a common answer that does not solve the problem! First read and understand the problem correctly and then make recommendations.
    Please show me a result.
  21. Closed: Re: Transfer function for a dual band pass filter (small task from network theory)

    The slope with 4.5dB has a ripple of 0.05dB! As motivation I included the plot with tolerances of +-2% for all elements in the LC network.
    I agree. There are many tools and this task should not be a...
  22. Closed: Transfer function for a dual band pass filter (small task from network theory)

    In the past it was more difficult to find a transfer function for a given specification. With today's powerful computers, that shouldn't be a problem anymore...
    As a small example, the specification...
  23. Closed: Re: How to calculate stopband attenuation for Chebyshev bandpass filter

    Before using a tool whose output you don't understand, it would be better to study some technical literature.
    The terms used to specify a filter can be found in every good filter book. Or read the...
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    Closed: Re: High Q air core inductanne

    I totally agree.
    This is the reason for the java-tool. Of course not one simple formula, but many effects are taken into account.
    If you are interested, test the tool and compare it with a...
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    Closed: Re: High Q air core inductanne

    Hi
    If you're interested, I can send you a small java program for calculating air coils.
    145519

    - - - Updated - - -

    With the online coil calculator ...
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