## Antenna Scatterers Analysis Program

# Source Code Description:
Subroutine GANT1

**GANT1**

**PURPOSE: ** to consider the wire structure as a
transmitting antenna and calculate the input impedance and
current distribution.

**METHOD: ** If a wire antenna is driven by a voltage
generator v_{i} located at one of the current sampling points
l_{i} and if displacement currents are neglected, Ampere's law
yields

V_{m} = v_{i }F_{m} (l_{i})
where F is the sinusoidal expansion function. Thus, the
excitation voltages V_{m } will vanish everywhere except where
v_{i } is not zero.

The DO LOOP ending with statement 50 uses the delta-gap
model defined above to determine the excitation voltage
CJ(I) for all the dipole modes. These are stored
temporarily in CG(I). Then subroutine SQROT is called to
obtain a solution of the simultaneous linear eguations.
SQROT stores the solution (the loop currents) in CJ(I).

In the DO LOOP ending at statement 80, the complex power
input and input impedance(s) are calculated. The
time-average power input (PIN) is the real part of the
complex power input.

Subroutine RITE is called to make the transformation
from the loop currents to the branch currents. If IWR is a
positive integer, RITE will write out the list of branch
currents.

Finally, GANT1 calculates the radiation efficiency by calling subroutine GDISS to obtain the time-average power dissipated in the lumped loads and the imperfectly conducting wire.

CALLED BY:

CALLS TO:

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Last modified on:
3 Nov 2007
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