Re: ONE SIMPLE QUESTION!

jkeller_at_gauss.engga.uwo.ca wrote:
>
> Anyone,
>
> After reading the ONLINE NEC2 MANUAL, I realized that there is no description of the cards,
>
> NH or NE !!
>
>
Jeff:

  It should be there soon, as I sent the html to Peter a couple of weeks ago.
I understand he's just back from vacation, and probably trying to dig out.

  In any event, here's the plain text version, attached.

-- 
Charlie Panek                   Hewlett Packard Company
charlier_at_lsid.hp.com            Lake Stevens Division
                                Everett, Washington

                                Near Fields (NE, NH)
Purpose: To request calculation of near electric fields in the vicinity of
         the antenna (NE) and to request near wgnatic fields (NH).

Card:
          Cols Parameter
         ----------------------
          1- 2 NE or NH
          3- 5 I1 NEAR
          6-10 I2 NRX
         11-15 I3 NRY
         16-20 I4 NRZ
         21-30 F1 XNR
         31-40 F2 YNR
         41-50 F3 ZNR
         51-60 F4 DXNR
         61-70 F5 DYNR
         71-80 F6 DZNR

Parameters:
         Integers
            NEAR (I1) - Coordinate system type. The options are:
                       0 - rectangular coordinates will be used.
                       1 - spherical coordinates will be used.

         Remaining Integers Depend on Coordinate Type
            a. Rectangular coordinates (NEAR = 0)
                NRX (12) - Number of points desired in the X, Y, and
                NRY (I3) - Z directions respectively. X changes
                NRZ (I4) - the most rapidly, then Y, ind then Z.
                             The value 1 is assumed for any field left blank.

            b. Spherical coordinates (NEAR = 1)
                (I2) - Number of points desired in the r, phi, and theta
                (I3) - directions, respectively. r changes the most
                (I4) - rapidly, then phi, and then theta. The value 1
                        is assumed for any field left blank.

         Floating Point Fields

         Their specification depends on the coordinate system chosen.
            a. Rectangular coordinates (NEAR = 0)
                XNR (F1) - The (X, Y, Z) coordinate position (F1, F2,
                YNR (F2) - F3) respectively, in meters of the first
                ZNR (F3) - field point.

                DXNR (F4) - Coordinate stepping increment in meters for the
                DYNR (F5) - X. Y, and Z coordinates (F4, F5, F6), respectively.
                DZNR (F6) - In stepping, X changes most rapidly, then Y, and
                             then Z.

            b. Spherical coordinates (NEAR = 1)
                (Fl) - The (r, phi, theta) coordinate position (Fl, F2, F3)
                (F2) - respectively, of the first field point. r is in
                (F3) - meters, and phi and theta are in degrees.

                (F4) - Coordinate stepping increments for r, phi, and theta
                (F5) - (F4, F5, F6), respectively. The stepping increment
                (F6) - for r is in meters. and for phi and theta is in
                           degrees.

Notes:
When only one frequency is being used, near-field cards may be
grouped together in order to calculate fields at points with various
coordinate increments. For this case, each card encountered
produces an immediate execution of the near-field routine and the
results are printed. When automatic frequency stepping is being
used [i.e., when the number of frequency steps (NFRQ) on the FR card
is greater than one], only one NE or NH card can be used for program
control inside the frequency loop. Furthermore, the NE or NH card
does not cause an execution in this case. Execution will begin only
after a subsequent radiation-pattern card (RP) or execution card (XQ)
is encountered (see respective write-ups on both of these cards).

The time required to calculate the field at one point is equivalent
to filling one row of the matrix. Thus, if there are N segments in
the structure, the time required to calculate fields at N points is
equivalent to the time required to fill an N x N interaction matrix.

The near electric field is computed by whichever form of the field
equations selected for filling the matrix, either the thin-wire
approximation or extended thin-wire approximation. At large distances
from the structure, the segment currents are treated as infinitesimal
current elements.

If the field calculation point falls within a wire segment, the
point is displaced by the radius of that segment in a direction
normal to the plane containing each source segment and the vector
from that source segment to the observation segment. When the
specified field-calculation point is at the center of a segment, this
convention to the same as is used in filling the interaction matrix.
If the field point is on a segment axis, that segment produces no
contribution to the H-field or the radial component of the E-field.
If these components are of interest, the field point should be on or
outside of the segment surface.
Received on Thu Jun 20 1996 - 18:06:00 EDT