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→History: revert "used in waveguide" to "implemented in waveguide". It's made from waveguide, not used in one. |
→History: Why has importance been removed from Richards, but not Kuroda? Stating explicitly that Kuroda overcame practical problems with Richards - a point that was lost in the copyedit |
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Planar formats began to be used with the invention of [[stripline]] by [[Robert M. Barrett]]. Although stripline was another wartime invention, its details were not published<ref>Barrett & Barnes (1951)</ref> until 1951. [[Microstrip]], invented in 1952,<ref>Grieg and Englemann (1952)</ref> became a commercial rival of stripline; however, planar formats did not start to become widely used in microwave applications until better dielectric materials became available for the substrates in the 1960s.<ref>Bhat & Koul, p. 3</ref> Another structure which had to wait for better materials was the dielectric resonator. Its advantages (compact size and high quality) were first pointed out<ref>Richtmeyer (1939)</ref> by R. D. Richtmeyer in 1939, but materials with good temperature stability were not developed until the 1970s. Dielectric resonator filters are now common in waveguide and transmission line filters.<ref>Makimoto & Yamashita, pp. 1–2</ref>
== References ==
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