Sensormatic Electronics Corporation

Motorola Corporation

Markus B Kopp

Richard Loyd Copeland

Alessandro Perrotta

Quirino Balzano

Wayne H Martin

Paul N Manente

Daniel Yeboah

An antenna feedpoint assembly includes a printed circuit board (,), a signal conductor feed element (,) mounted on the printed circuit board (,), and a secondary ground element (,) placed parallel to the signal conductor feed element (,) wherein an electromagnetic coupling is made between the signal conductor feed element (,) and the secondary ground element (,) for an improved matching of the antenna (,) without an additional matching circuit. The secondary ground element (,) comprises a mounting portion (,) connected to a ground plane (,) and a protruded portion (,) extended from the mounting portion (,) such that the protruded portion (,) is elevated from and substantially parallel to the signal conductor feed element (,) serving as the antenna feedpoint contact.

Secondary antenna ground element

An antenna system includes a main antenna (,) and a parasitic element (,). The parasitic element (,) is rotatably coupled (,) to the main antenna (,), the antenna system being movable from a closed position to an open position, in which the main antenna (,) is coupled to the parasitic element (,) to cause the parasitic element (,) to operate as a passive radiator element and to radiate (,) along with the main antenna (,) to enhance the gain of the antenna system.

Passive flip radiator for antenna enhancement

An apparatus for deactivating a surveillance tag comprising a first coil located in a first plane, a second coil located in a second plane, and a third coil located in a third plane such that the third plane intersects the first and second planes at an angle that is greater than zero degrees and less than ninety degrees.

Apparatus for deactivation of electronic article surveillance tags

An apparatus for use in activating and/or deactivating an EAS tag which comprises a support, a first number of one or more first discrete small magnets arranged in a first row and a second number of one or more second discrete small magnets arranged in a second row. Each first discrete small magnet is situated adjacent a second discrete small magnet and has a first region of a first magnetic polarity and a second region supported on the support of a second magnetic polarity. Each second discrete small magnet has a first region of the second magnetic polarity and a second region supported on the support and of the first magnetic polarity.

Apparatus for activating/deactivating sensors used with EAS tags

An antenna arrangement in which a first antenna means is arranged to define a null contour adjacent the first antenna means and at which the magnetic flux from the first antenna means is substantially a null and in which a second antenna means is arranged to substantially follow the null contour.

Antenna arrangement with reduced coupling between transmit antenna and

An antenna system comprises at least first and second antennas circumscribing a common center thereof at respective different distances from the common center, and circuitry for exciting the first antenna at a greater level than the second antenna, the excitation of the first and second antennas by such exciting circuitry being of respective opposite phasing. The excitation circuitry is operative to provide first fields adjacent the antenna system to a predetermined distance therefrom which are essentially controlled by the excitation of the first antenna and to provide for second fields beyond the predetermined distance which are of lesser strength than the first fields and are determined by both of the first and second antennas.

Antenna array for enhanced field falloff

A system for use in detecting the presence of an electronic article surveillance tag in an area subject to surveillance comprises first and second antenna units disposed on opposed sides of the area, each of the antenna units incorporating therein at least first and second antennas circumscribing a common center thereof at respective different distances from the common center. Excitation circuitry is provided for exciting each first antenna at a greater level than each second antenna, the excitation of the first and second antennas by the exciting circuitry being of respective opposite phasing. The system further comprises a receiver connected to the first and second antenna units and alarm circuitry connected to the receiver to provide output indication of the presence of the tag in the area subject to surveillance.

Growing community of inventors

Pompano Beach, FL, United States of America

Markus B Kopp