RF Contactor Microstrip Impedance Matching
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Solution Overview
Problem
Existing radiofrequency contactors often fail to match the characteristic impedance of the pin contactor with the testing circuit board, leading to deterioration of radiofrequency signals during inspections of semiconductor devices.
Innovation Solution
A radiofrequency contactor with a microstrip line structure on the testing circuit board, featuring a radiofrequency signal pin contactor, a ground block, and additional side ground conductors, which are strategically positioned and connected to maintain impedance matching and prevent signal deterioration by adjusting the inductance and capacitive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pin contactor is used for conduction between electrodes and wiring, then electrical connection is achieved, but the characteristic impedance of the pin contactor does not match the wiring conductor, causing radiofrequency signal deterioration
Solution Approach 1:
The patent introduces a microstrip line structure as an intermediary transmission path between the pin contactor and the wiring conductor. This microstrip line acts as a mediator that transforms the impedance characteristics, allowing the pin contactor (with its fixed impedance) to interface properly with the wiring conductor (with its characteristic impedance), thereby eliminating signal deterioration while maintaining reliable electrical connection.
Solution Approach 2:
The patent changes the transmission path from a direct pin-to-wiring connection to a microstrip line-based path with controllable impedance parameters. By adjusting the microstrip line's geometric parameters (width, thickness, substrate properties), the characteristic impedance can be precisely controlled to match both the pin contactor and wiring conductor, resolving the impedance mismatch problem.
2Adaptability or versatility
If the sizes and shapes of the pin contactor and ground conductor are determined under constraints of the radiofrequency semiconductor device, then the device structure is accommodated, but the characteristic impedance matching between the pin contactor and wiring conductor cannot be achieved
Solution Approach 1:
The patent segments the transmission path into distinct functional sections: the pin contactor section, the microstrip line section, and the wiring conductor section. Each section can be independently designed and optimized - the microstrip line section specifically is designed to provide impedance transformation, allowing the pin contactor and wiring conductor to maintain their device-constrained dimensions while achieving overall impedance matching through the intermediate microstrip line.
Data Source
AI summary
A radiofrequency contactor includes a testing circuit board having a dielectric substrate, a lower ground conductor on a lower surface of the dielectric substrate, and a radiofrequency signal wiring conductor on an upper surface of the dielectric substrate, a radiofrequency signal pin contactor located on the upper surface of the dielectric substrate and connected to the radiofrequency signal wiring conductor, a ground block located on the upper surface of the dielectric substrate and spaced apart from the radiofrequency signal wiring conductor and the radiofrequency signal pin contactor, and a first side ground conductor and a second side ground conductor provided on the upper surface of the dielectric substrate and spaced apart from the radiofrequency signal wiring conductor and the radiofrequency signal pin contactor.