Operation

In operation of the calculator an operating wavelength is specified, along with a generic radiator target configuration from a menu of configurations in the upper right corner. chamber configuration is defined at an operating wavelength lambda by the dimensions and position of the radiator along with the dimension of the target dA and its position relative to the origin. A menu of generic configurations is presented in the upper right of the main screen. Most menu items have a _lambda extension. This extension designs all features of the configuration, scaled by wavelength, including sometimes the power level of the system. The _lambda extension serves as a working baseline. After use of the lambda extension, changes may be made in the configuration under the same menu item without extension.

At any point the baseline lambda extension may be returned to for reference.

Calibration

The following results from classical theory are available in the bottom table to verify the integrations and estimates presented by the calculator.

Half wave dipole power:

P=36.6 Io^2

the radiated power is independent of frequency. See Ulaby

Half wave dipole maximum Poynting:

15 Io^2 /( pi r^2 )

the maximum Poynting vector broadside from dipole. See Ulaby

Short dipole power:

40 (dim_a/lambda)^2 pi^2 Io^2

The power radiated by short dipole increases with frequency. See Ramo. Whinnery, Van Duzer

Short dipole maximum Poynting:

(1.5) S_isotropic

Directivity of half wave dipole

1.64

See Jordan and Balmain , Ulaby

Directivity of short dipole

1.5

See Jordan and Balmain

Beamwidth of half wave dipole

78 degree

See Ulaby

Beamwidth of short dipole.

90 degree

See Ulaby