s_parameters介紹(38頁(yè))-展示頁(yè)
2025-05-09 10:34本頁(yè)面
【正文】 eters described as S11, S21, etc. Can you explain? 11 Sparameters Now lets look at S21. S21 refers to the signal exiting at Port 2 for the signal incident at Port 1. Scattering parameter S21 is the ratio of the two waves b2/a1. I have seen Sparameters described as S11, S21, etc. Can you explain? 12 Sparameters Now lets look at S21. S21 refers to the signal exiting at Port 2 for the signal incident at Port 1. Scattering parameter S21 is the ratio of the two waves b2/a1. S21? Surely that should be S12?? I have seen Sparameters described as S11, S21, etc. Can you explain? 13 Sparameters Now lets look at S21. S21 refers to the signal exiting at Port 2 for the signal incident at Port 1. Scattering parameter S21 is the ratio of the two waves b2/a1. S21? Surely that should be S12?? S21 is correct! Sparameter convention always refers to the responding port first! I have seen Sparameters described as S11, S21, etc. Can you explain? 14 Sparameters 15 Sparameters A linear work can be characterised by a set of simultaneous equations describing the exiting waves from each port in terms of incident waves. S11 = b1 / a1 S12 = b1 / a2 S21 = b2 / a1 S22 = b2 / a2 Note again how the subscript follows the parameters in the ratio (S11=b1/a1, etc...) I have seen Sparameters described as S11, S21, etc. Can you explain? 16 Sparameters 17 Sparameters Sparameters are plex (. they have magnitude and angle) because both the magnitude and phase of the input signal are changed by the work. (This is why they are sometimes referred to as plex scattering parameters). 18 Sparameters These four Sparameters actually contain eight separate numbers: the real and imaginary parts (or the modulus and the phase angle) of each of the four plex scattering parameters. 19 Sparameters Quite often we refer to the magnitude only as it is of the most interest. How much gain (or loss) you get is usually more important than how much the signal has been phase sh
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