Some folks might be interested to know that a form of the K9AY loop
is used as a E/H field probe.
In the idealized form, you have a loop that is split into two halves,
with a termination resistor in each split. If you take the sum and
difference of the voltages across the two resistors, you can measure
the E field and H field separately (assuming you've picked the right
resistor value).
In a typical implementation, only half the loop is used, against a
conductive ground plane (still with a termination at each end). The
K9AY is sort of the same thing, except that only one voltage is
measured (some combination of E and H, then).
For more info
F.Gassmann, J. Furrer, "An Isotropic Broadband Eelectric and Magnetic
Field Sesnor for Radiation Hazard Measurements", 1993 IEEE
International Symp on EMC, 9-13 Aug 1993, pp150-109
But Gassman cites:
M. Kanda, "An Electromagnetic Near Field Sensor for Simultenous
Electric and Magnetic Field Measurements", IEEE Trans on EMC, Vol
EMC-26, #3, Aug 1984.
There's a pile o' old stuff from NBS about this, too.
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