High-Q loop metal detector antenna

Operates at frequencies above 100 kHz

Electronics Sensors
A soldier uses a metal detector to search the area around two simulated rockets during a command training exercise at Fort Polk. (Lance Pounds/Army)

The U.S. Army has developed a sensitive loop antenna design for use in metal detectors. It is available now for use in new and improved products.

The improved detector utilizes an emitted magnetic field exceeding 100 kHz from a transmission and reception loop. A classifier compares the emitted signal to the received signal and a change in frequency between the two indicates an object.

For metal targets, the frequency shift can be positive and for ferrite and other targets, the frequency shift can be negative. This frequency shift can be created by the proximity of the target, causing a change in the impedance of the loop antenna. Long-range detection can occur with relatively low power requirements.

Innovative businesses or entrepreneurs can access the design and sell enabled products in the marketplace by licensing the patent rights from the Army. Contact TechLink for more information on licensing after reviewing the patent linked below.

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