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Microstrip antenna with heterogeneous dielectrica

Discussion in 'Electronic Basics' started by Christoph Hörterer, Dec 10, 2005.

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  1. Hi,
    I'd need some help with the calculation and simulation of a rectangular
    microstrip antenna.

    The question is rather simple. We have a dielectrica of given thickness
    and e_r. Now we shall combine it with another material with given e_r.
    The thickness shall vary.
    These two materials shall be stacked upon each other.

    But how to calculate now a resulting e_r_total of both materials?

    I know it is very basic and perhaps one should know it, but I can't
    remind how to solve this.

  2. Bob Monsen

    Bob Monsen Guest

    On Sat, 10 Dec 2005 05:24:49 -0800, Christoph Hörterer wrote:
    <wants PCB antenna design help>

    I stumbled across this recently. Thankfully, I didn't trip.

    Bob Monsen

    Religion is a solace to many people and it is even conceivable that
    some religion, somewhere, really is Ultimate Truth. But in many cases,
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    a state of grace and the rest of the world were 'heathens' and by
    'heathen' they meant such people as our brother Mahmoud. It meant that
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    Our hymn book was loaded with such arrogance mindless, conceited,
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    high opinion he had of us and us alone, and what hell everybody else
    was going to catch come Judgment Day.
  3. Hi,
    I'm sorry. I don't quite understand the mentioned page.
    It doesn't really solve my problem.

    I searching for a formular or a way how to calculate one epsilon_r from
    two different dielectrica with different epsilon_r, as I have seen it
    once with capacitors. But I can't remember how to calculate it.
    It should be almost the same with microstrip antennas as the are
    capacitors, no?

    Perhaps I didn't describe my problem very precisely.
  4. Hi,
    In the simple case of two stacked dielectrics (e_r1 & e_r2) of
    the same thickness, it would seem to me that the reciprocal of the
    resultant e_r might just equal the sum of the reciprocals of both
    e_r1 and e_r2. This follows from the simple formula for two
    capacitors in series where the presence or absence of the central
    plate doesn't change the capacitance.

    Cheers - Joe
  5. Thanks a lot. I think this is it. Just couldn't remember my physics
    class ;-)

    Regards, Christoph
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