. The Bell System technical journal . erating mode, n, andalso locate the center of the operating rectangle. An enlarged plot of this area as in Fig. 7 will show all modes possible inthe cavity. Some adjustment of the precise location of this area may thenbe desirable to eliminate certain types or numbers of unwanted modes. Forexample, it is extremely difficult to suppress TE 02 modes without affectingthe TE 01 mode, because of the very close resemblance of the field configura-tions. On the other hand, most TM modes are easy to handle. It may be possible to select an operating area such as the
. The Bell System technical journal . erating mode, n, andalso locate the center of the operating rectangle. An enlarged plot of this area as in Fig. 7 will show all modes possible inthe cavity. Some adjustment of the precise location of this area may thenbe desirable to eliminate certain types or numbers of unwanted modes. Forexample, it is extremely difficult to suppress TE 02 modes without affectingthe TE 01 mode, because of the very close resemblance of the field configura-tions. On the other hand, most TM modes are easy to handle. It may be possible to select an operating area such as the rectangle blockedout in Fig. 1 in which all extraneous responses (with the exception of thecompanion TM HI) are avoided. The largest rectangle which can beinscribed here is limited by the TE 311 and TE 112 modes. This will * p = X 10^ ohm-cni—the International Standard value for copper. 424 BELL SYSTEM TECHNICAL JOURNAL permit a ± per cent frequency range. Several designs of 3 kmc echoboxes have been based on this Fig. 6—Design chart for cylindrical cavity resonators operating in the TE Gin modes.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
