Transmit and receive loop antenna

Details Transmit and receive loop antenna Transmit and receive loop antenna

H - Electricity

01

Q

H01Q 11/12 (2006.01) H01Q 7/04 (2006.01) H01Q 21/00 (2006.01) H01Q 21/29 (2006.01)

Patent

CA 2196686

A transmit and receive loop antenna (10) includes a first loop element (12) coupled to an electrical circuit element for generating near fields and far fields and a shunt loop element (16) surrounding the first loop element (12) such that voltages are induced in the shunt loop element (16) by the fields generated by the first loop element (12). The shunt loop element (16) is constructed from a continuous loop of conductor to maximize current from the voltages induced in the shunt loop element. The current in the shunt loop element generates fields which largely cancel the fields generated by the first loop element in the far field. Thus, the first loop element (12) and the shunt loop element (16) establish a surveillance zone in an area proximate the loop elements.

L'invention concerne une antenne-cadre d'émission et de réception (10), qui comprend un premier élément cadre (12) couplé à un élément de circuit électrique, en vue de produire des champs proches et des champs lointains, et un élément cadre shunt (16) entourant le premier élément cadre (12), de sorte que différentes tensions sont induites dans l'élément cadre shunt (16) par les champs que produit le premier élément cadre (12). L'élément cadre shunt (16) est fabriqué à partir d'une boucle continue de conducteur dans le but de maximiser le courant résultant des tensions induites dans l'élément cadre shunt. Le courant obtenu dans l'élément cadre shunt engendre des champs qui annulent généralement les champs produits par le premier élément cadre dans le champ lointain. Ainsi, le premier élément cadre (12) et l'élément cadre shunt (16) créent une zone de surveillance dans une région proche des éléments cadres.

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