- #1
yungman
- 5,718
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I want to verify the theory of TEM mode tx lines how the signal travel. Please correct me if I am wrong. This mainly refer to stripline, microstrip( assume TEM) etc.
1) The signal is transmited as EM wave through the dielectric between the two lines, not actually current through the conductors.
2) Charge and current density on the surface of the conductor only as the consequence of the Maxwell equations:
[tex] \nabla X \vec H = \vec J_{free} \;\;\hbox { on the surface of the conductor plates.}[/tex]
[tex]\nabla X \vec E = \rho_{free} \;\;\hbox { on the surface of the conductor plates.}[/tex]
3) The electrical signal is launghed by injection of current at the input end, the current density create the TEM wave according to the Maxwell equation:
[tex] \nabla X \vec H = \vec J_{free} \;\;\hbox { and} \;\;\nabla X \vec E = \rho_{free} [/tex]
4) At the end of the transmission line, the electrical signal is the consequence of the surface current density and charges according to the same Maxwell's equation. This electrical signal is to drive any electrical circuit as if the electrical signal is driven directly through the transmission line.
Bottom line, in the middle of the transmission, it is TEM electromagnetic wave. The electrical signal is the consequence of the surface charge and surface current density while the EM wave propagate in between the plates of the stripline or microstrip.
I alway thought it was the electrical signal traveling through the conductor before but I don't think that is true because the velocity of electrons are too slow.
Please help me by commenting on this.
1) The signal is transmited as EM wave through the dielectric between the two lines, not actually current through the conductors.
2) Charge and current density on the surface of the conductor only as the consequence of the Maxwell equations:
[tex] \nabla X \vec H = \vec J_{free} \;\;\hbox { on the surface of the conductor plates.}[/tex]
[tex]\nabla X \vec E = \rho_{free} \;\;\hbox { on the surface of the conductor plates.}[/tex]
3) The electrical signal is launghed by injection of current at the input end, the current density create the TEM wave according to the Maxwell equation:
[tex] \nabla X \vec H = \vec J_{free} \;\;\hbox { and} \;\;\nabla X \vec E = \rho_{free} [/tex]
4) At the end of the transmission line, the electrical signal is the consequence of the surface current density and charges according to the same Maxwell's equation. This electrical signal is to drive any electrical circuit as if the electrical signal is driven directly through the transmission line.
Bottom line, in the middle of the transmission, it is TEM electromagnetic wave. The electrical signal is the consequence of the surface charge and surface current density while the EM wave propagate in between the plates of the stripline or microstrip.
I alway thought it was the electrical signal traveling through the conductor before but I don't think that is true because the velocity of electrons are too slow.
Please help me by commenting on this.