There
are 50,000 trillion
cells in the body, and even in older people the body is still actively
creating another billion new cells every hour, so the
incorruptibility
of DNA is all-
important in our health and survival.
In the real world of cell phone antennas our ability to produce the ideal
current configurations have been challenging. There are certain side effects;
one of these is the production of so called 'near' fields.
Only Nokia 5100/6100 Cell Phones can be made to control "Near
Field" exposure with the use of accessories for Hearing Aid compliance.
(View Accessories To Control Near Field)
If we consider the dipole "Cell Phone Antenna"; once current begins flowing,
charge will build up on the ends, simply because it has nowhere to go. This
charge will produce a voltage between one end of the dipole antenna and the
other and will thus be, in effect, be a capacitor. There will be E fields from
the positive pole of the capacitor to the negative pole. These E fields, being
part of a capacitor, are reactive or 'near' fields.
The H fields produced by the current in a dipole are directly the result of
RF currents and are therefore part of the radiated wave. However, in a dipole
there will be near H fields produced by the displacement currents, which exist
while the E field is building or collapsing. These near E and near H fields,
unlike the EM waves produced by oscillating electrons, are not coupled. Their
ratios can be individually controlled, for example, by changing the geometry of
the dipole. Furthermore, the H field reaches its maximum when the E field is
changing the fastest, and the capacitive E field its maximum when the voltage at
the ends of the dipole are maximum. Therefore, the two fields in belowpicture
are not in time phase. This is why the near fields do not radiate, but
simply store energy in the immediate vicinity of the antenna. We would just as
soon do without them, but they are an inevitable 'parasitic' effect of the
operation of the standard cell phone antenna.
The E and H fields are produced individually by either a current or a
voltage and do not affect each other in any way. These E and H fields exist in
relatively close proximity to the antenna, are 180 degrees out of phase with
each other and, collectively known as the reactive or near field.
Near field strengths die out very quickly with distance from the antenna.
Thus, when measuring the gain or pattern of an antenna, one must be sure to be
in the region where the near fields have fallen well below the radiated fields
or a false result will be obtained. This danger has led some to draw false
conclusions in the past about a particular antenna's performance.
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The E and H fields are produced individually by either a current or a
voltage and do not affect each other in any way. These E and H fields exist in
relatively close proximity to the antenna, are 180 degrees out of phase with
each other and, collectively known as the reactive or near field.
