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Patent Searching and Data


Title:
ADJUSTABLE PASSIVE ELEMENT
Document Type and Number:
Japanese Patent JPH02213202
Kind Code:
A
Abstract:
PURPOSE: To prevent the operation of an adjustable passive element from being affected by the presence of a metallic driver for adjustment by forming an inducing element of a conductor with a hollow between the both sides, and with one end connected with an adjustable impedance element, and adjusting an adjustable element even through the hollow part. CONSTITUTION: This element is constituted of an inductance element S and a variable capacitor CV serially connected between two terminals E1 and E2 . The inductance element S is constituted of an inducing element having a hollow between the both ends, and an inner diameter for inserting an adjustable core NA and a driver TV. One E1 is grounded, and the other end is brought into contact with the variable capacitor CV. HF currents with at least 300MHz are allowed to flow on the surface of an inducing element so that the action of an oscillator circuit can not be affected by the driver TV. It is desired that the inductance element S is shaped like a cylindrical tube. The outer diameter and length is adapted to the operating frequency band of the oscillator circuit for generating a desired inductance value.

Inventors:
PIEERU SHIYANTOO
ERITSUKU DA SHIRUBUA
Application Number:
JP28602089A
Publication Date:
August 24, 1990
Filing Date:
November 01, 1989
Export Citation:
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Assignee:
PHILIPS NV
International Classes:
H01P1/20; H01P7/00; H03H1/00; H03H5/00; H03J1/06; H03J3/20; (IPC1-7): H01P1/20; H01P7/00
Attorney, Agent or Firm:
Tadahiko Ito (2 outside)