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Recent content by jcy

  1. J

    Can you gige me some ideas about the antenna books?

    For basic antenna theory, I recommend Stutzman, Thiele: Antenna Theory and Design
  2. J

    what does this vectorel showing mean?

    Also, the Hankel function argument √[(x-x')^2+(y-y')^2] gives the Cartesian distance between the source point (x',y') and the field point (x,y).
  3. J

    I need a good book about Functional and Complex analysis

    introductory compelx analysis rapidshare I think it would be hard to find a single book that covers both complex analysis and functional analysis well. For functional analysis I would recommend Introductory Functional Analysis with Applications: Erwin Kreyszig For complex analysis, some...
  4. J

    complementry error fucntion

    well, 1-(1-erfc)^2 = 1 - [1-2erfc + erfc^2] =2erfc-erfc^2 The erfc is 2 for x->-∞, 1 for x=0, and 0 for x->∞. For x greater than about 1 , I would agree that 1-(1-erfc)^2 = 1 - [1-2erfc + erfc^2] ≈ 2erfc but for all x, I do not think the relationship holds. Are you sure there isn't some...
  5. J

    What exactly is kernel in mathematics?

    Re: kernel In mathematics, "kernel" has a number of meanings depending on the context. See here, http://en.wikipedia.org/wiki/Kernel_(mathematics)
  6. J

    Looking for references about functional analysis

    Re: Help me Although the original topic is old, I would say there is no "best " book in math. Advanced Engineering Mathematics by Kreyszig is indeed an excellent excellent book for engineering mathematics, but it is in no way a good book for functional analysis. However, I second the...
  7. J

    Help me subtract V1 from M1*V1/M1+M2

    Re: help with equation Are you sure you typed your equations correctly? The first equation M1*V1/M1 + M2 reduces immediately to V1+M2 since the M1's cancel.
  8. J

    Antenna on cylindrical surface

    Try these books "Conformal Array Antenna Theory and Design", Josefsson and Persson "Design of Nonplanar Microstrip Antennas and Transmission Lines", Wong
  9. J

    broadband microstrip patch antenna

    Re: microstrip patch antenna I would expect that when you change the dielectric height, you will have to slightly resize your patch to keep the same resonant frequency. If the resonant frequency shifted up when you increased the height, you will probably need to increase the dimensions of the...
  10. J

    Need a help to simulate a reflector for monopole antenna T_T

    Re: Need a help to simulate a reflector for monopole antenna I guess I am still a little confused about what you are trying to do. Maybe you need to define exactly what kind of pattern you want. Just saying not omni-directional is very vague. What I had in mind was monopoles perpindicular...
  11. J

    Need a help to simulate a reflector for monopole antenna T_T

    Re: Need a help to simulate a reflector for monopole antenna Well, from the picture you posted it seems like you are using a patch antenna instead of monopoles, so I'm not sure if my comment is appropriate. However, I do not understand why your teacher says there are manufacturing...
  12. J

    Need a help to simulate a reflector for monopole antenna T_T

    Re: Need a help to simulate a reflector for monopole antenna Your post was a bit ambiguous as to whether the antenna you are supposed to use is the monopole or the patch. If it is the monopole, instead of a reflector, you could try placing some additional monopoles (non-excited) with varying...
  13. J

    Collin and F. J. Zucker, Antenna Theory

    antenna theory collin zucker Yes, they both show one copy of Part I (it is a two volume book). Based on the bookseller location, it seems both sights are referencing the same copy of the book. Unfortunately, I cannot afford to pay $250-$300 for half of the book (or for the whole book for...
  14. J

    About integrable function

    I think kalyanram is slightly in error to say that a function with an infinite number of discontinuities is not integrable. Actually, to be precise, you first need to specify which type of integral you are considering and the domain/range space. For the Riemann integral over a finite (closed?)...
  15. J

    Collin and F. J. Zucker, Antenna Theory

    antenna theory collin I second this request. This book seems nearly impossible to find unless you have access to a university library. John

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