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  1. In accord with recommendations of the ICO committee on image assessment [J. Opt. Soc. Am. 51, 1441 (1961)], the following substitutions may be made within this letter:Modulation Transfer for sine-wave response;MTfor SWR;MTfor response.
  2. Manual of Physical Properties of Aerial and Special Materials (Eastman Kodak Co., Rochester, New York, 1961).
  3. Dieter P. Paris, J. Opt. Soc. Am. 51, 988 (1961).
    [Crossref]
  4. D. H. Kelly, J. Opt. Soc. Am. 51, 319 (1961).
    [Crossref]
  5. J. A. Eyer, J. Opt. Soc. Am. 48, 938 (1958).
    [Crossref]
  6. H. Frieser, Phot. Sci. Eng. 4, 324 (1960).
  7. H. W. Bode, Network Analysis and Feedback Amplifier Design (D. Van Nostrand Company, Inc., Princeton, New Jersey, 1945).
  8. J. G. Truxal, Automatic Feedback Control Systems Synthesis (McGraw-Hill Book Company Inc., New York, 1955).

1961 (3)

1960 (1)

H. Frieser, Phot. Sci. Eng. 4, 324 (1960).

1958 (1)

Bode, H. W.

H. W. Bode, Network Analysis and Feedback Amplifier Design (D. Van Nostrand Company, Inc., Princeton, New Jersey, 1945).

Eyer, J. A.

Frieser, H.

H. Frieser, Phot. Sci. Eng. 4, 324 (1960).

Kelly, D. H.

Paris, Dieter P.

Truxal, J. G.

J. G. Truxal, Automatic Feedback Control Systems Synthesis (McGraw-Hill Book Company Inc., New York, 1955).

J. Opt. Soc. Am. (4)

Phot. Sci. Eng. (1)

H. Frieser, Phot. Sci. Eng. 4, 324 (1960).

Other (3)

H. W. Bode, Network Analysis and Feedback Amplifier Design (D. Van Nostrand Company, Inc., Princeton, New Jersey, 1945).

J. G. Truxal, Automatic Feedback Control Systems Synthesis (McGraw-Hill Book Company Inc., New York, 1955).

Manual of Physical Properties of Aerial and Special Materials (Eastman Kodak Co., Rochester, New York, 1961).

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Figures (8)

Fig. 1
Fig. 1

Bode diagram for low-pass filter.

Fig. 2
Fig. 2

Bode diagram for SWR of a typical film.

Fig. 3
Fig. 3

Experimental Panatomic-X SO-130. Solid line is published data; dotted line is calculated.

Fig. 4
Fig. 4

Plus-X Aerocon Type No. 8402 (Thin Base). Solid line is published data; dotted line is calculated.

Fig. 5
Fig. 5

Plus-X Aerocon Type No. 8401. Solid line is published data; dotted line is calculated.

Fig. 6
Fig. 6

Panatomic-X Type No. SO-130.

Fig. 7
Fig. 7

Plus-X Aerocon Type No. 8402 (Thin Base).

Fig. 8
Fig. 8

Plus-X Aerocon Type No. 8401.

Tables (1)

Tables Icon

Table I Descriptive parameters and derived expressions for the SWR of various films.

Equations (12)

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T ( k ) = - π 2 b 2 k 2
T ( k ) = 1 / [ 1 + ( 2 π / a ) 2 k 2 ] n ,
G ( s ) = 1 / ( 1 + τ S ) ,
20 log 10 G ( j w ) = 20 log 10 { 1 / [ 1 + ( f / f 0 ) 2 ] 1 2 } ,
T F ( k ) = 1 / [ 1 + ( 2 π / a 0 ) 2 k 2 ] 1 2 = 1 / [ 1 + ( k / k 0 ) 2 ] 1 2 ,
SWR = T ( k ) = T F ( k ) n ,
T ( k ) = 1 / [ 1 + ( k / k 0 ) 2 ] n / 2 .
20 log 10 SWR = - 20 ( n / 2 ) log 10 [ 1 + ( k / k 0 ) 2 ]
20 log 10 SWR - 20 n log 10 ( k / k 0 ) .
20 log 10 SWR - 20 n [ log k - log k 0 ] .
d / d ( log 10 k ) ( 20 log 10 SWR ) - 20 n dB / decade = slope ,
n = Slope of SWR at high frequencies ( dB / decade ) / - 20.