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Cecil, W5DXP wrote:
"What does Terman say in Sec. 4-11?" I gave a verbatim response from 4-11 at 11:03am on Jul. 17, 2003. I`ll add the footnote from page 109: "Another way of expressing this situation is to say that the stub position and length are so selected that the input impedance of the line (l1) shunted by the input impedance of the stub-line (a) will equal the characteristic impedance Zo." (l1 is the length of line between the stub and ZL. Fig. 4-17 provides position and length of the stub vs. SWR. The conclusion is that a match is achieved so there is no reflection on the transmission line. The match has eliminated the reflection which was there during the transistion period, but no longer appears there during the steady state. Your Bird wattmeter will show a forward power but no reflected power because the load with its stub provides a match to the transmission line. Best regards, Richard Harrison, KB5WZI |
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Cecil's Math | Antenna |