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1. WO2004097978 - ANTENNE CHARGEE PAR UNE LIGNE A MEANDRES CHARGEE DE FERRITE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

WHAT IS CLAIMED IS:
1. In a meander line loaded antenna in which the meander line has a number of sections, a method for lowering the low frequency cut off of the antenna without affecting the high frequency cut off, comprising:
surrounding one of the meander line sections with ferrite, whereby the size of the antenna need not be increased to lower the low frequency cut off thereof.

2. The method of Claim 1, wherein the ferrite is in a toroidal form.

3. The method of Claim 1, wherein the antenna has a top plate and wherein the top plate is fed with a direct connection to the top plate.

4. The method of Claim 1, wherein the antenna has a capacitively fed.

5. The method of Claim 4, wherein the antenna has a top plate and wherein the capacitive feed for the antenna includes a conductor having an end spaced from an end of the top plate.

6. A method of electrically lengthening an element of a meander line comprising surrounding the element with ferrite.

7. The method of Claim 6, wherein the addition of ferrite effectively produces an inductor in series with the element.
8. The method of Claim 6, wherein the ferrite is in the form of a torus.

9. A wide bandwidth meander line loaded antenna having a reduced low frequency cut off, comprising:
a ground plane;
a top plate;
a meander line having segments and located between the ground plane and top plate; and,
ferrite disposed about a segment of the meander line, thus to increase the effective electrical length thereof.

10. The antenna of Claim 9, wherein said top plate is direct fed.

11. The antenna of Claim 9, wherein said top plate is capacitively fed.

12. The antenna of Claim 9, wherein said meander line has a number of different elements, said ferrite surrounding that element which is electrically the longest.