Patent ID: 6018282
Filing Date: 2000-01-25
Classification: H01P

Abstract:
A high-frequency circuit module for use with a multi-layer high-frequency circuit substrate, comprising:a voltage-controlled variable-passband filter, having a voltage-controlled variable-capacity capacitor and a control voltage applying means for applying a control voltage, for varying a capacity of the voltage-controlled variable-capacity capacitor in accordance with the control voltage so as to vary filter characteristics, wherein said voltage-controlled variable-capacity capacitor includesan insulating layer having a first surface and a second surface, said insulating layer being made of a dielectric material whose dielectric constant changes according to an electric field applied thereto,a first electrode, provided on said first surface, to which the control voltage for producing the electric field is applied, andsecond and third electrodes, provided adjacent to and parallel with one another on said second surface, to which are applied high-frequency signals,wherein said insulating layer is made of a ceramic material, and said voltage-controlled variable-capacity capacitor, along with a remainder of the voltage-controlled variable-passband filter, is integrally provided within a substrate made of a ceramic material, and said control voltage applying means is an integrated circuit mounted on said substrate so that said integrated circuit and said substrate are integral with each other,in which components other than said integrated circuit of the voltage-controlled variable-passband filter are provided at least partially in a multi-layer substrate.