![]() all the incident power is absorbed by component losses). any power that isn't transmitted to the load, is reflected back towards the source.) The system Q can be increased somewhat to "peak" the response, compensating for component losses, but this is only possible up to a limit equal to the component Q itself - and that at infinite insertion loss (i.e. In general, loss in filter causes the transition band (frequencies near \$F_0\$) to droop, absorbing some power rather than purely transmitting or reflecting it. Note that these components ideally should have very high (component) Q, and the filter design has not accounted for any losses (component Q) associated with them. The sense is usually evident from context if this were discussing fields in space, the impedance of free space would be relevant. I'm using the latter case here (while also illustrating it has been chosen equal to the system impedance!), but used the system sense earlier. *Which I have also not explained yet \$Z_0\$ is unfortunately rather well used, referring variously to the impedance of free space, the characteristic impedance of a transmission line or surrounding system, or the characteristic impedance of a resonant circuit, filter or network. (The reactances are complementary because their positions are: shunt lesser than \$Z_0\$, series greater.) an inductor looks inductive ( \$Z \propto \omega^1\$), resistor looks resistive ( \$Z \propto \omega^0\$), or capacitor looks capacitive ( \$Z \propto \omega^\$. The component has a reasonable component-ness in the frequency range of interest (i.e.When we discuss the Q of a component, a couple of assumptions apply: There are at least two common applications of "Q". There are several confusions at play here, I think. Therefore, it seems to me that a certain transformation from series model to parallel one (or vice versa) is true only for a certain frequency, but we have said that Q is related to the fractional bandwidth, so it seems to me that the transformation is true for all frequencies inside that bandwith. ![]()
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