. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 430 BELL SYSTEM TECHNICAL JOURNAL length section of line as a step-up or step-down transformer was described. Hriefly the principle of operation is the fact that the sending end impedance Zg and the receiving end impedance Zr are related to the characteristic impedance Zo by the simple expression: Zj s^ r — ^0 • (8) Thus, by choosing the proper characteristic iinpedance any two real impedances may be matched provided these do not dififer too greatly. IMPEDANCE TRANSFOR
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 430 BELL SYSTEM TECHNICAL JOURNAL length section of line as a step-up or step-down transformer was described. Hriefly the principle of operation is the fact that the sending end impedance Zg and the receiving end impedance Zr are related to the characteristic impedance Zo by the simple expression: Zj s^ r — ^0 • (8) Thus, by choosing the proper characteristic iinpedance any two real impedances may be matched provided these do not dififer too greatly. IMPEDANCE TRANSFORMER Is I*- -<3 zs zs-ol^ Zo Zo=ZsZr -Zr „ Fig. 13—The principles underlying the use of one quarter wave-length bars as a transformer are shown in the upper diagram. The lower illustration depicts a commercial installation. Often the scheme is made workable by constricting the line spacing for a one-quarter wave-length section. Where a large difference in trans- former line and transmission line spacing is undesirable the transformer line may comprise conductors of large diameter. A transformer set-up of this type is shown in Fig. 13. There is another effective way for transforming line impedances by. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Telephone and Telegraph Company. [Short Hills, N. J. , etc. , American Telephone and Telegraph Co. ]
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
