. The Bell System technical journal . rn varies slowly with both phase velocity and amplitude distributionalong the axis. As shown in Figs. 1 and 2, these quantities are slowly vary-ing functions of X over a considerable range of polyrod proportions. At Developed by Mr. D. H. RiiiR. DISTANCE FROM FEED, I, IN WAVELENGTHS ^ H MATERIAL STYRAMIC NOISEGAININ DB / P1 \ HARD RUBBER ^-^ / c 1 I 5 \ ACETATE BUTYRATE 90 4 i i 1 t 1 / *N V \ o k? ^ ^^ ^i -50 -40 -30 -20 -10 0 10 20 30 40 50 DEGREES OFF AXIS Fig. 12—Effect of dielectric loss on poly
. The Bell System technical journal . rn varies slowly with both phase velocity and amplitude distributionalong the axis. As shown in Figs. 1 and 2, these quantities are slowly vary-ing functions of X over a considerable range of polyrod proportions. At Developed by Mr. D. H. RiiiR. DISTANCE FROM FEED, I, IN WAVELENGTHS ^ H MATERIAL STYRAMIC NOISEGAININ DB / P1 \ HARD RUBBER ^-^ / c 1 I 5 \ ACETATE BUTYRATE 90 4 i i 1 t 1 / *N V \ o k? ^ ^^ ^i -50 -40 -30 -20 -10 0 10 20 30 40 50 DEGREES OFF AXIS Fig. 12—Effect of dielectric loss on polyrod performance. ^V 1 I N. \ s x. \^-^. k rj a. -5 -10 r ^ r 1 \ S\s\ \ \ \ \ REVERSE -15 \ \\ \ \ 10LU ffl -20O \ - J^. ;- -; ;^^ \ \ ELECTRIC POLARIZATION INSAME PLANE (WORST CASE) z \ -I. -- -50 M X ^ SPACING, d, IN WAVELENGTHS Fig. 13—Crosstalk, between 850 BELL SYSTEM TECHNICAL JOURNAL. POLY ROD ANTENNAS 851 present, the usable bandwidth is therefore limited primarily by the frequencyresponse of the coupling arrangements from polyrod to waveguide or coaxialline. We have been exclusively concerned so far with plane polarized circularly symmetrical polyrod such as in Fig. 8 can be used equally wellto radiate circularly polarized waves. To do this, the polyrod is fed froma waveguide in which circulary polarized dominant waves are generated bymeans of a 90° phase shift section.^- The effect of dielectric loss upon polyrod performance is shown in Fig. 12,to be compared with Fig. 7. The power factors are: Styramic, ;hard rubber, ; acetate butyrate, ; pol3^styrene, Mate-rials having power factors less than are satisfactory for polyrod an-tennas. Figure 13 shows the crosstalk between adjacent polyrods, that is, thepower received in one radiator when the other is energized. For polyrodspointing in the same direction, separations grea
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
