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Recent content by Xavipersonal

  1. X

    trapezoidal rule - runge kutta 4th order

    Hi, I have solved an differencial equation using the Euler Fordward method. It was not accurately enough. So I am thinking to use the trapezoidal rule but I have read also that this method takes a lot of time until it converges. The other option was the runge-kutta equation because it is even...
  2. X

    Eb/N0 vs. BER curves for ASK or FSK with not matched filter

    Hi there, I am studying how bad is demodulation in case of not having a real match filter as the first block in the reception of the signal. do you know where could I find curves which take into account this error in the filter?? The only curve I found is the teoretical one and I guess, its...
  3. X

    when a band pass filter cannot be used in a reception

    yes, i ll try. I am implementing a communication transmission in Matlab, it means, there are a transmitter and a receiver. Modulation could be ASK. I have programmed a 'weak signal detection method' in the receiver but it doesnt work as well as 'a coherent detection system (BPF + cos(wt))'...
  4. X

    when a band pass filter cannot be used in a reception

    Hi, I would like to know in which situations is not possible the use of a Band Pass Filter in the reception of a communication. I am implementing and alternative system and it would be nice to know when is better to use it in stead of a BPF and a demodulation signal, for example. Thanks a lot...
  5. X

    strong noise which has zero mean & BP filter

    Hi, I am adding strong noise which has zero mean to an OOK modulation. I use for that the matlab function 'randn'. But after this, I apply a chebyshev 3º order bandpass filter and I don't really know if the output signal would have the same property of zero mean or not? Thanks in advance
  6. X

    torque, angular acceleration

    Thanks you very much Eduardo it has been really useful answer
  7. X

    torque, angular acceleration

    question -- You are an astronaut onboard the Space station. A satellite with is Iz=1200kgm^2 rotating along is z-axis, which is pointing directly towards you. The satellite is slowly coming towards you. It has a steady rotation about its z-axis of OMEGAz=0.1rad/s. The satellite has handles on...
  8. X

    integrator block from simulink to matlab

    Hi everybody, I am implementing a duffing oscillator. Actually, I have done it in Simulink and I am trying to model it in Matlab but I dont know how to implement the integrator? This is the way I have tried: integral(j)=ts*input(j)+integral(j-1); using a for loop. But results are pretty far...
  9. X

    amplifier not band-limited in cascade

    but all the amplifiers have its own matching network.
  10. X

    amplifier not band-limited in cascade

    When i verify the cascaded amplifiers with ADS S-parameter simulation, i get a nice curve showing that i obtain 60 dB gain at the IF frequency, which is what i want. However, for real implementations 60 dB of gain can become a problem if the amplifier is not band-limited, i.e. by having filters...
  11. X

    feko radiation pattern, how can i plot it?

    I've done all the steps in a feko video about a dielectric resonator antenna. but at the end, it is only shown hot to plor a s-parameters graph..nothing about the near field or the radiattion pattern and I don't know how to do it thanks a lot
  12. X

    help in feko lite with the mesh size

    I've tried with the value lambda/4 but the same error appears.. I asked for the full version to the FEKO website but I need it as fast as I could. I'm working also with another program HFSS, but every simulation takes more than 4 hours and it 's impossible. Thanks a lot, your advices are really...
  13. X

    help in feko lite with the mesh size

    Yes, I'm using FEKO LITE. Is there no possibility to reduce the number of triangles? The figure is a dielectric cylindre (radio=12.5mm and height= 30mm) + a ground plane (radio 60mm)..is it very big? Thanks for the answer
  14. X

    disadvantages of dielectric resonator antennas?

    Hi! I'm working in a DRA presentation but I'm really new in this field. I have some question that are imposibles to solve by myself.. what are the disadvantages of a DRA conpared to other antennas?? in C-band (4 to 8GHz) what antenna is better (microstrip or DRA) and why? thanks a lot.
  15. X

    help in feko lite with the mesh size

    help in feko lite Hi, it's my fist time in this forum.. I'm working in a simulation of a cylindrical dielectric simulator antenna. The problem appears when I try to create the mesh, the program doesn't allow me to do it because " The number of mesh triangles (33682) are not allowed to exceed...

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