RF strip line resonator with a curvature dimensioned to inductively cancel capacitively caused displacements in resonant frequency

US6653914B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Dietmar Gapski · Bocholt, DE
• Volker Detering · Nideggen, DE
• Jurgen Lepping · Essen, DE

Key dates

• Filing date: Mar 23, 2001
• Grant date: Nov 25, 2003
• Expiry date: Jun 28, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01P7/084
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

In order to compensate changes in the resonant frequency of the resonator occurring owing to fluctuations in the distance between the reference distance (ds) and an actual distance (ds±&Dgr;ds) in an RF strip line resonator with a strip line (10) which is arranged at a desired distance (ds) from a metallic conductor (11), the strip line (10) is curved. This curvature induces eddy currents in the conductor (11). The eddy currents bring about a reduction in the inductance of the RF strip line resonator. The smaller/larger the distance between the strip line and the metallic conductor becomes, the smaller/larger this inductance becomes. Since shortening/lengthening the distance between the two conductors is however also accompanied by an increase/reduction in the capacitance of the RF strip line resonator, with the correct dimensioning of the curved strip line the two aforesaid effects cancel one another out and the frequency of the RF strip line resonator is approximately stable with respect to the given fluctuations in distance.