Connection Unit Lead Pins for High-Frequency Signal Integrity
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Solution Overview
Problem
Conventional connection units for flexible printed circuits and ceramic substrates face alignment issues during assembly, leading to misalignment, short-circuiting, and poor high-frequency characteristics due to signal loss at frequencies above 20 GHz.
Innovation Solution
A connection unit design featuring a ceramic substrate with signal and grounded conductors, lead pins, and a flexible substrate with insulating layers, where metal blocks or grounded conductors are strategically placed to reduce impedance mismatch and facilitate easier assembly by shortening connection distances and preventing misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a flexible printed circuit is directly fixed to the field-through portion of a ceramic substrate, then high-frequency signal loss is reduced, but assembly alignment becomes difficult and misalignment occurs
Solution Approach 1:
The patent introduces lead pins as intermediary components between the flexible printed circuit and the ceramic substrate. These lead pins extend from the flexible substrate through insulating layers to connect with signal lines and grounded conductors on the ceramic substrate, serving as a mediator that facilitates both electrical connection and mechanical alignment while maintaining low signal loss at high frequencies.
2Reliability
If mounting positions are aligned precisely to prevent short-circuiting, then connection reliability improves, but assembly complexity increases
Solution Approach 1:
The lead pins are pre-positioned and extend through the insulating layers of the flexible substrate before final assembly. This preliminary positioning establishes predetermined mounting locations that guide the alignment process, ensuring that the flexible printed circuit connects to the correct signal lines and grounded conductors on the ceramic substrate without requiring complex real-time alignment procedures.
3Loss of energy
If the connection distance between the flexible printed circuit and ceramic substrate is shortened, then high-frequency characteristics are maintained, but assembly tolerance becomes tighter
Solution Approach 1:
The lead pins extend in the vertical dimension through the insulating layers of the flexible substrate, allowing the flexible printed circuit to be positioned at a distance from the ceramic substrate while maintaining effective electrical connection. This vertical extension provides assembly tolerance in the horizontal plane without increasing the effective current path length, thus maintaining low signal loss at high frequencies.
Data Source
AI summary
A connection unit includes: a ceramic substrate; a first signal line on the ceramic substrate; a first grounded conductor on the ceramic substrate and electromagnetically coupled to the first signal line; a first lead pin having a first end connected to an upper surface of the first signal line and a second end protruding beyond the ceramic substrate; a second lead pin having a first end connected to an upper surface of the first grounded conductor and a second end protruding beyond the ceramic substrate; a flexible substrate including an insulating layer through which the first and second lead pins penetrate, a second signal line on a first major surface of the insulating layer and connected to the second end of the first lead pin, and a second grounded conductor on a second major surface of the insulating layer and connected to the second end of the second lead pin.