Electrical Connector Absorber Member Mitigating High-Frequency Resonances
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Solution Overview
Problem
High-speed electrical connectors experience electrical interference, such as cross-talk and resonant frequency noise, particularly at high signal transmission frequencies above 15 or 20 GHz, due to resonance spikes in the mating zone, which degrade signal transmission.
Innovation Solution
The electrical connector incorporates an absorber member composed of a lossy material with limbs that project into the card cavity and align with ground contacts, effectively mitigating high-frequency resonances by absorbing electrical energy and dissipating it, thereby improving signal transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If absorber member with lossy material is used to reduce high frequency resonances, then electromagnetic interference reduction is achieved, but insertion loss may increase
Solution Approach 1:
The absorber member is strategically positioned only in the mating zone where resonances occur, with limbs extending only into the region between ground contacts. This localized placement allows EMI reduction precisely where needed while minimizing the absorber's interaction with signal paths, thereby reducing insertion loss
Solution Approach 2:
The absorber member acts as an intermediary element positioned between the ground contacts and the signal transmission path. It absorbs electromagnetic energy from resonances without directly interfering with the primary signal flow, effectively mediating between EMI reduction requirements and signal transmission efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces electromagnetic interference in the mating zone, particularly at frequencies above 20 GHz, enhancing signal transmission quality and maintaining negligible insertion loss.
Implementation Method 1
The absorber member is composed of a lossy material... effectively mitigating high-frequency resonances by absorbing electrical energy and dissipating it
Implementation Method 2
The absorber member is composed of a lossy material having a greater electric loss tangent or magnetic loss tangent than the contact organizer
Implementation Method 3
The absorber member is composed of a lossy material having a greater electric loss tangent or magnetic loss tangent than the contact organizer
Data Source
AI summary
An electrical connector includes a contact organizer, signal and ground contacts, and an absorber member. The contact organizer has a mating end, and includes a first wall and a second wall that define a card cavity therebetween. The card cavity is open at the mating end to receive a mating circuit card therein. The signal contacts and the ground contacts are held by the contact organizer along at least the first wall. The absorber member is mounted to the first wall of the contact organizer at the mating end. The absorber member includes at least one limb composed of a lossy material. Each limb projects into the card cavity and aligns with a corresponding one of the ground contacts. Each limb is configured to electrically connect to a corresponding ground pad of the mating circuit card.