January 1997
Beginner
435 pages
18h 29m
English
Content preview from Microwave and Wireless Communications Technology
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Combining MIC Amplifiers in Parallel 287
ances being matched. Such an impedance-matching system is often called a Q sec-
tion. The required characteristic impedance for the transmission line is found from
Z' o : x/ZLZo
(14- 14)
where
Zo'=
characteristic impedance of the quarter-wavelength section
ZL
= load impedance
Zo
= system impedance (for example, 50 f2)
EXAMPLE 14-10
Calculate the impedance required of a quarter-wavelength transmission line Q
section used to transform 50 f2 to 100 s
Solution
Z'o = x/ZLZo
= q(lO0)(50)
= q5000 = 70.7a
In the case of parallel MIC devices, the nominal impedance at port C of the Wilkin-
son ...
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