. The Bell System technical journal . CENTER OFCURVATURE CENTER OFCURVATURE. b+a Fig. 1 — Coordinates used in circular bend in circular waveguide. CIRCULu\R WAVEGUIDE WITH INHOMOGENEOUS DIELECTRIC 1213 The appendix contains brief descriptions of three dielectric compen-sators which can be inserted in a straight section of guide adjacent to abend. The first two are transducers which convert TEox to a normal modeof the curved guide; they are subject to bandwidth limitations as men-tioned by Miller.^ The third type merely takes the output mixture ofTEoi and TMn from a plain bend with a pure TEoi
. The Bell System technical journal . CENTER OFCURVATURE CENTER OFCURVATURE. b+a Fig. 1 — Coordinates used in circular bend in circular waveguide. CIRCULu\R WAVEGUIDE WITH INHOMOGENEOUS DIELECTRIC 1213 The appendix contains brief descriptions of three dielectric compen-sators which can be inserted in a straight section of guide adjacent to abend. The first two are transducers which convert TEox to a normal modeof the curved guide; they are subject to bandwidth limitations as men-tioned by Miller.^ The third type merely takes the output mixture ofTEoi and TMn from a plain bend with a pure TEoi input, and reconvertsit all to TEoi ; it is essentially a broadband device. The spurious modesgenerated by a bend plus compensator have not been calculated, but itis very unlikely that a smaller bending radius will be permitted when thecompensator is outside the bend than when it is inside. I. THEORY Generalized Telegraphists Equations To describe electromagnetic fields in a curved circular waveguide oneis naturally led to use bent cylindrical coordinates (p, <p,
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
