. The Bell System technical journal . olic Cylinder Bounded by Parallel Plates. Probe Feed. Alternatively this mode can be generated as indicated by Fig. 25 by a wave-guide aperture with the proper polarization. The TEni mode, when used, is usually generated by a rectangular wave-guide aperture set between the plates with proper polarization as indicatedin Fig. 25. Care must be taken that only the desired mode is TEM mode will be unexcited if only the desired polarization is presentin the feed. The next parallel mode is unsymmetrical and therefore evenif it can be transmitted will
. The Bell System technical journal . olic Cylinder Bounded by Parallel Plates. Probe Feed. Alternatively this mode can be generated as indicated by Fig. 25 by a wave-guide aperture with the proper polarization. The TEni mode, when used, is usually generated by a rectangular wave-guide aperture set between the plates with proper polarization as indicatedin Fig. 25. Care must be taken that only the desired mode is TEM mode will be unexcited if only the desired polarization is presentin the feed. The next parallel mode is unsymmetrical and therefore evenif it can be transmitted will be unexcited if the feed is placed symmetricallywith respect to the two plates. Parallel plate antennas as shown in figures 24 and 25 are useful whereparticularly large aspect ratios are required. The aperture dimension per-pendicular to the plates is equal to the plate spacing and therefore small. 262 BELL SYSTEM TECHNICAL JOURNAL It can be increased somewhat by the addition of flares. The other dimen-sion can easily be made Fig. 25—Parabolic Cylinder Bounded b> Parallel Plates. Wave Guide Feed.
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