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Recent content by rf_engineer_5

  1. R

    inductor air solenoid heating

    Going the ampacity tables is not bad but the values listed are usually DC or 50/60Hz. As frequency goes up this all goes out of the window. I do have access to a 3D solver but there must have been a way to hand calculate before 3D solvers came about.
  2. R

    inductor air solenoid heating

    I am not sure what literature to look in. Are you talking about a book? IEEE papers? This is not something I have done in the past so I don't know what I don't know.
  3. R

    inductor air solenoid heating

    Are there some formulas for how one can calculate the steady state temperature (or temp rise) of a wound air solenoid at a given high frequency and applied current through it? This would be for frequencies around 10MHz for example. The solenoid would have physical dimensions but just looking for...
  4. R

    wilkinson lower impedance version

    Thanks for the replies. I do understand the problems of implementation at lower freqs but mainly I was just looking for architecture help for impedance transformation within a wilkinson. From all of the text books I have and other resources found online, the vast majority of wilkinsons are...
  5. R

    wilkinson lower impedance version

    A question - are designs of wilkinson power combiners/dividers common with impedances less than 50ohms? Trying to find if 50ohms/12.5ohms is feasible for freqs less than 25MHz. I am just not seeing much literature for this type of design that have built in impedance transformations. thanks

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