National Taiwan University

Empass Technology Inc.

Ying-Cheng Tseng

Tzong-Lin Wu

Po-Jui Li

Chi-Hsuan Cheng

Chin-Yi Lin

Yang-Chih Huang

A common-mode noise filter is provided, and comprises a first transmission structure and a second transmission structure. At least one first transmission unit is connected between a first signal input end and a first signal output end of the first transmission structure in series. At least one second transmission unit is connected between a second signal input end and a second signal output end of the second transmission structure in series. Two first capacitors are connected between the first signal input end and the second signal input end in series, and connected at a first node together. A first common-mode noise suppression unit is connected between the first node and a reference potential, and comprises a second capacitor and a first lossy element connected to the second capacitor in series or parallel. The first common-mode noise suppression unit can absorb a common-mode noise via the first lossy element.

Common-mode noise filter

The present invention provides a noise suppression device and equivalent circuit thereof. The noise suppression device comprises a metal plate and at least one first resonance unit. The first resonance unit comprises a plurality of first resonators. Each of the first resonators comprises a first metal segment and at least one first conductive connection segment, the first metal segment is connected to the first conductive connection segment. When the first resonance unit is configured on the metal plate, each of the first metal segments is electrically connected to the metal plate by the corresponding first conductive connection segment. When the resonance of the first resonator occurs, a noise transmitted on the metal plate can be conducted to the first resonator and suppressed by the first resonator.

Noise suppression device and equivalent circuit thereof

The present invention provides a common-mode signal absorber, which comprises an impedance-matching network and a common-mode signal reflection circuit. A differential-mode signal is inputted into input ends of the impedance-matching network, and outputted from output ends of the common-mode signal reflection circuit. When a common-mode signal is inputted into the common-mode signal absorber, the common-mode signal reflection circuit is for reflecting the common-mode signal within a specific frequency band. Afterward, the reflection of the common-mode signal within the specific frequency band will be absorbed by an impedance element of the impedance-matching network. Thus, the common-mode signal within the specific frequency band may be absorbed by the impedance-matching network so as to avoid to interfere signals transmitted on a communication system.

Common-mode signal absorber

Common-mode signal absorber and equivalent circuit thereof

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Taipei, Taiwan

Ying-Cheng Tseng