Computer program solves integral equation for currents induced by electric or magnetic plane wave incident upon one or more conducting cylinders with a midplane of symmetry. Program utilizes symmetry of the geometry. Restrictions on the program are given

Hatfield, J.

Rusch, W. V. T.

English

Computer program, 2DSCAT, solves integral equation for currents induced by electric or magnetic plane wave incident upon one or more conducting cylinders. Subroutine, FIELD, assumes that an incident wave is perpendicular to the cylindrical surface. Restrictions on this program are given

NASA Technical Reports Server

January 1971
	 Brief 71-10007 
w
NASA TECH BRIEF 
NASA Pasadena Office 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield; Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.f. 20546. 
Non-Symmetrical Two Dimensional Scattering Program 
The problem: 
To compute the scattering properties of an elec-
tric or magnetic plane wave incident upon one or 
more cylindrical objects. 
The solution: 
A computer program, 2DSCAT, which solves the 
integral equation for the currents on conducting 
cylinders. These currents are induced by the incident 
E-wave or an incident H-wave. 
How it's done: 
The axis of the cylindrical objects is assumed to 
be parallel to the Z-axis. Therefore, the cross section 
in the X-Y plane is sufficient to describe the problem 
geometry. Each cylinder is described by a set of line 
segments. The end-points of each line segment must 
conform to the right-hand screw (i.e., counter-clock-
wise in the X-Y plane). 
The subroutine, FIELD, assumes that an incident 
plane wave is perpendicular to the cylindrical sur-
face. (If desired, the user can supply his own 
FIELD subroutine for other field computations.) 
Restrictions on this program are as follows: 
1. The number of specified line segments cannot 
exceed 100. 
2. The user must supply his own FIELD and 
GEOM subroutines if he wishes to deviate from 
the standard subroutines supplied with 2DSCAT.
3. All angles are assumed to be in units of de-
grees. 
4. All distances are assumed to be in units of 
-	 wavelengths. 
Notes: 
1. This program is written in FORTRAN V for use 
on the UNIVAC-1108 Exec 8 computer. 
2. Program number NPO-11577 is the IBM-7094 
version of this program, written in FORTRAN IV. 
3. COSMIC also has available program numbers 
NPO-11578 and NPO-11579 which are the 
UNIVAC-! 108 and IBM-7094 versions, respectively, 
of the Symmetrical Two Dimensional Scattering 
Program. 
4. Additional information may be obtained from: 
COSMIC 
Barrow Hall 
University of Georgia 
Athens, Georgia 30601 
Reference: B71-10007 
Patent status: 
No patent action is contemplated by NASA. 
Source: W.V.T. Rusch and J. Hatfield of

Jet Propulsion Laboratory

under contract to

NASA Pasadena Office

(NPO-1 1576 & 11577) 
Category 09 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19710000007 2020-03-17T02:17:48+00:00Z


Non-symmetrical two dimensional scattering program

January 1971
	 Brief 71-10008 
NASA TECH BRIEF 
NASA Pasadena Office 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield; Virginia 22151. Requests for individual copies or questions relating to the. Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Symmetrical Two Dimensional Scattering Program 
The problem: 
To compute the scattering properties of an elec-
tric or magnetic plane wave incident upon one or 
more cylindrical objects with a midplane of sym-
metry. 
The solution: 
A computer program which solves the integral 
equation for the currents on conducting cylinders. 
These currents are induced by an incident E-wave or 
an incident H-wave. This program also takes advantage 
of the symmetry of the geometry. 
How it's done: 
The axis of the cylindrical objects is assumed 
to be parallel to the Z-axis. Therefore, the cross 
section in the X-Y plane is sufficient to describe 
the problem geometry. Each cylinder is described by 
a set of line segments. The end-points of each line 
segment must conform to the right-hand screw (i.e., 
counter-clockwise in the X-Y plane). 
Restrictions on the program are as follows: 
1. The number of specified line segments cannot 
exceed 180. 
2. The user must supply his own incident-field 
routine. 
3. All angles are assumed to be in units of de-
grees.
4. All distances are assumed to be in units of 
wavelengths. 
Notes: 
1. This program is written in FORTRAN V for use 
on the UNIVAC-1108 Exec 8 computer. 
2. Program number NPO-11579 is the IBM-7094 
version of this program, written in FORTRAN IV 
3. COSMIC also has available program number 
NPO-11576 and NPO-11577 which are tht 
UNIVAC-1108 and IBM-7094 versions, respec 
tively, of the Non-Symmetrical Two Dimensiona 
Scattering Program. 
4. Additional information may be obtained from: 
COSMIC 
Barrow Hall 
University of Georgia 
Athens, Georgia 30601 
Reference: B71-10008 
Patent status: 
No patent action is contemplated by NASA. 
Source: W.V.T. Rusch and J. Hatfield of 
Jet Propulsion Laboratory
under contract to
NASA Pasadena Office
(NPO-1 1578 & NPO-1 1579) 
Category 09 
This documett was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19710000008 2020-03-17T02:17:49+00:00Z
E


Symmetrical two dimensional scattering program

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