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Recent content by evoplus

  1. E

    Functions of HE and EH modes

    Hi everyone, I would ask some questions regardin the above modes. Can some one please kindly explain the meanin of these two mode? Are there in any relationship to the TEM, TE and TM wave propagation? Thank you
  2. E

    What is TEM, TE and TM wave??

    Hi, Just curious but are they in any relationship with the HE and EH modes?
  3. E

    Recommend good book on mixers

    Re: good book for mixer Hi, U may want take a look at the Stephen A Maas, Microwave mixer. It provides a very detailed info on mixers
  4. E

    Looking for books or articles on rat race design

    Hi, I'm looking for books or articles on rat race design, preferably mixer part, do anyone haves any of these info or knows where to find them? Thanks
  5. E

    Question on Stephen A Maas, Microwave mixer

  6. E

    What are the insertion points in a waveguide?

    Question on waveguide Hi everyone, I came across a book that says that a dielectric material can cause reflections at the insertion points in the waveguide. So what are this insertion points in the 1st place? Where are the locations of them in the waveguide? Thanks
  7. E

    Question on Stephen A Maas, Microwave mixer

    Hi VSWR, could you explain more on below
  8. E

    Should the return loss (S11) be as high as possible ?

    Return loss Hi, Could I check the return loss (S11) is preferred to be as high as possible right? Apart from the reason why we want the return loss for example waveguide to be as high as possible is to prevent the signal from reflecting back and cause interferences to the next incoming...
  9. E

    Question on Stephen A Maas, Microwave mixer

    Hi, I have some doubts regardin the Stephen A Maas, Microwave mixer which I hoped that you guys can help me clear of. It mentioned that in the singly balanced mixer part that as both the applied RF voltage and the conductance wave forms are in phase, therefore all the voltage and current...
  10. E

    What does the close form expression mean?

    close form expression Hi, I don't know whether if it's the correct place to place this. I would like to ask what is the maning of closed form expression. I notice this term in some RF books but it seems to me that its a math enquiry so I post this here
  11. E

    Whats the physical meaning of loss tangent ( tan δ)

    Re: loss tangent Yes it's correct that tan δ = σ/ωε. Loss tangent is the ration b/w the imaginary and real parts of the complex permittivity where the complex permittivity can be defined as εc = ε-j (σ/ω) The valie of the loss tangent describes how lossy a material is, if σ » ω ε, it...
  12. E

    How important is Boundary Condition and how is it used?

    Boundary Condition Hi, I would like to know more on the boundary conditions. What is the significance of the boundary conditions and how are they being used especially in designning part? Thanks
  13. E

    Free Space Wavelength

    Hi, If that is the case, what would be the wavelength_material be if the wavelength_free space is not known in the first place?
  14. E

    Verification of S11 and S21

    Hi vfone, What I meant is that if for a two port network for example a waveguide, if I run stimulations using software or doing measurment, I could estimate some results that would give me an idea of the actual results So for the conversion part, my estimate of the S21 which is also the...
  15. E

    Verification of S11 and S21

    Hi, I would like to verify something. In order to have less power being reflected back, when I measured the between 2 ports, I should have a high insertion loss(S11) which is prefered to be more than -20dB. Whereas in order to most of the power to flow thru fr 1 port to another port, my...
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