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→History: Restoring "correct description". This was an important moment. Earlier ideas were plain wrong, and even Kelvin only got part of the answer. |
→History: revert "used in waveguide" to "implemented in waveguide". It's made from waveguide, not used in one. |
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Mason's work was concerned with the coaxial form and other conducting wires, although much of it could also be adapted for waveguide. Before [[World War II]], there was little demand for distributed element circuits; the frequencies used for radio transmissions at the time were lower than the point at which distributed elements became advantageous. Lower frequencies had a greater range, a primary consideration for [[Broadcasting|broadcast]] purposes; however, the wartime requirements for radar changed that. There was a surge in distributed element filter development (an essential component of radars), and the technology was extended from the coaxial ___domain into the waveguide ___domain.<ref>Levy & Cohn, p. 1055</ref>
The wartime work was mostly unpublished until after the war for security reasons, which made it difficult to ascertain who was responsible for each development. An important centre for this research was the [[MIT Radiation Laboratory]] (Rad Lab), but work was also done elsewhere in the US and Britain. The Rad Lab work was published<ref>Fano & Lawson (1948)</ref> by Fano and Lawson.<ref>Levy & Cohn, p. 1055</ref> Another wartime development was the hybrid ring. This work was carried out at [[Bell Labs]], and was published<ref>Tyrrell (1947)</ref> after the war by W. A. Tyrrell. Tyrrell describes hybrid rings
George Matthaei led a research group at [[Stanford Research Institute]] which included [[Leo C. Young|Leo Young]] and was responsible for many filter designs. Matthaei first described the interdigital filter<ref>Matthaei (1962)</ref> and the combline filter.<ref>Matthaei (1963)</ref> The group's work was published<ref>Matthaei ''et al.'' (1964)</ref> in a landmark 1964 book covering the state of distributed element circuit design at that time, which remained a major reference work for many years.<ref>Levy and Cohn, pp. 1057–1059</ref>
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