Fixed tuneable loop

H - Electricity – 01 – P

Patent

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Details

H01P 7/00 (2006.01) H01P 5/04 (2006.01) H01P 7/10 (2006.01) H03H 9/24 (2006.01)

Patent

CA 2275591

The present invention relates generally to filtering in e.g. mobile telephony. A new input loop is introduced wherein the input loop is fixed in its physical relation to the H-field. One end of this input loop is arranged to form a capacitance or an inductance which is then used to adjust the location of the maximum current node in the loop. The adjustment of the position of this maximum current node thereby adjusts the bandwidth of the RF signal. The fixing of the loop has the advantage of simplifying the procedure for tuning the filter. It also has the advantage of reducing the number of tools required for tuning, thereby allowing for a reduction in size occupied by the filter and isolator arrangement, and a reduction in the cabling and materials used.

L'invention concerne le filtrage, par exemple, d'un téléphone mobile, et plus particulièrement une nouvelle boucle d'entrée fixe et dont le couplage au champ magnétique "champ H" du filtre est fonction de son orientation physique par rapport à ce champ H. Une extrémité de cette boucle d'entrée forme une capacité ou une inductance utilisée ensuite pour régler la position du noeud à courant maximum de la boucle. En procédant à ce réglage, on règle également la largeur de bande du signal RF. La fixation de boucle offre l'avantage non seulement de simplifier la procédure d'accord du filtre mais aussi de réduire le nombre d'outils requis, ce qui permet de réduire l'encombrement du filtre et du dispositif isolateur ainsi que du câblage et du matériel utilisés.

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