Gamma matched, helical dipole microwave antenna with...

Details Gamma matched, helical dipole microwave antenna with... Gamma matched, helical dipole microwave antenna with...

A - Human Necessities

61

N

A61N 5/02 (2006.01) A61B 18/18 (2006.01) A61N 5/04 (2006.01)

Patent

CA 2169338

A catheter shaft carries a coaxial cable (220), the terminal end of which contains a dipole antenna (214) with opposing first and second helical elements (214A, 214B). This first and second helical elements (214A, 214B) originate from a common connection (222) to an outer conductor (224) of the coaxial cable (220). A tubular-shaped capacitor (200) is connected between an inner conductor (218) of the coaxial cable (220) and a point (232) on the second helical element (214B) where the resistive component of the antenna's impedance matches the characteristic impedance of the coaxial cable (220). This match minimizes reflective losses of the antenna (214), thereby maximizing power transfer to the antenna (214). The antenna (214) has an effective electrical length which is equal to one half the wavelength of the radiation emitted, independent of the physical length of the antenna (214).

Un tige de catheter porte un câble coaxial (22) dont l'extrémité terminale contient une antenne bipolaire (214) ayant des premier et second éléments hélicoïdaux opposés (214A, 214B). Les premier et second éléments hélicoïdaux (214A, 214B) partent d'une connexion commune (222) et vont jusqu'à un conducteur externe (224) du câble coaxial (220). Un condensateur tubulaire (200) est connecté entre un conducteur interne (218) du câble coaxial (220) et un point (232) sur le second élément hélicoïdal (214B) où la composante résistive de l'impédance de l'antenne concorde avec l'impédance caractéristique du câble coaxial (220). Cette concordance réduit au minimum les pertes de réflexion de l'antenne (214), maximalisant ainsi le transfert d'énergie vers l'antenne (214). L'antenne possède une longueur électrique effective qui est égale à la moitié de la longueur d'onde du rayonnement émis, indépendamment de la longueur physique de l'antenne (214).

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