公开(公告)号：US20220189739A1

公开(公告)日：2022-06-16

申请号：US17437446

申请日：2020-03-03

Applicant: COMET AG

Inventor： Thomas Fink ,  Kevin Häuser ,  Holger Maune ,  Daniel Kienemund ,  Joachim Binder ,  Rolf Jakoby ,  Nicole Bohn

IPC: H01J37/32 ,  H01G7/06 ,  H01G4/12 ,  C04B35/468 ,  C04B35/64

Abstract: A radio-frequency (RF) power variable capacitor capable of operating at, at least, 50 watts in the MHz range. The capacitor has a composite HDK-NDK ceramic dielectric. The HDK (high dielectric constant) component comprises an active matrix of barium strontium titanate, for example. Acoustic resonances are reduced or eliminated by the addition of a metal or metalloid oxide such as magnesium borate (NDK—low dielectric constant), which acts as an acoustic resonance reduction agent (ARRA) in the RF power domain. The acoustic resonances which previously occurred under bias voltage 500 V or 1100 V in prior art RF power variable capacitors are eliminated by the addition of the ARRA.

公开(公告)号：US11901160B2

公开(公告)日：2024-02-13

申请号：US17437446

申请日：2020-03-03

Applicant: COMET AG

Inventor： Thomas Fink ,  Kevin Häuser ,  Holger Maune ,  Daniel Kienemund ,  Joachim Binder ,  Rolf Jakoby ,  Nicole Bohn

IPC: H01J37/32 ,  C04B35/468 ,  H01G4/12 ,  C04B35/64 ,  H01G7/06

CPC classification number: H01J37/32183 ,  C04B35/468 ,  C04B35/64 ,  H01G4/1218 ,  H01G7/06

Abstract: A radio-frequency (RF) power variable capacitor capable of operating at, at least, 50 watts in the MHz range. The capacitor has a composite HDK-NDK ceramic dielectric. The HDK (high dielectric constant) component comprises an active matrix of barium strontium titanate, for example. Acoustic resonances are reduced or eliminated by the addition of a metal or metalloid oxide such as magnesium borate (NDK—low dielectric constant), which acts as an acoustic resonance reduction agent (ARRA) in the RF power domain. The acoustic resonances which previously occurred under bias voltage 500 V or 1100 V in prior art RF power variable capacitors are eliminated by the addition of the ARRA.