Communications: radio wave antennas – Antennas – Body-attached or connected
Patent
1998-12-11
2000-11-28
Ho, Tan
Communications: radio wave antennas
Antennas
Body-attached or connected
340600, H01Q 112
Patent
active
061541788
ABSTRACT:
The electromagnetic radiation monitor includes a low frequency surface charge sensor, a high frequency sensor, and a lossy material sandwiched between the two sensors. The surface charge sensor responds to electromagnetic radiation from about 100 KHz to about 1 GHz. The high frequency sensor responds to frequencies from about 300 MHz to about 100 GHz. An output signal from the low frequency sensor is detected, and provided to an adjustable gain amplifier. An output signal from the high frequency sensor is similarly provided to a second adjustable gain amplifier. Output signals from the two amplifiers are summed by a summing circuit, whose output signal is provided to one input of a comparator circuit. The output signal from the comparator circuit triggers an audible or visible alarm from the alarm circuit when electromagnetic radiation detected by either or both of the low and high frequency sensors causes the output signal of the summer circuit to exceed a threshold.
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Ho Tan
L-3 Communications Corporation
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