To develop and realize Hybrid PCBs for space applications through indigenous vendors
A Hybrid Printed Circuit Board (PCB) is a multilayer PCB that combines dissimilar materials to optimize electrical performance, improve system reliability, and enhance high-frequency RF applications. These PCBs utilize materials with significantly different critical properties compared to traditional multilayer PCBs. Hybrid PCBs may incorporate a mix of FR-4 materials with high-frequency PTFE materials, or use a combination of various high-frequency materials with different dielectric constants in a single multilayer board.
Hybrid PCBs enable the integration of a wide range of electronic circuits, making them ideal for advanced applications. This proposal aims to develop indigenous vendors for the realization of space-grade Hybrid Multilayer PCBs.
Salient Features of Hybrid PCBs:
- Integration of RF and high-frequency digital circuits onto a single PCB.
- Reduction in the overall electronics package size.
- Elimination or reduction of cables and wiring harnesses.
- Improved electrical performance with integrated EMI shielding.
- Enhanced thermal paths for better heat dissipation.
- Use of FR-4 for increased rigidity and easier component assembly.
- Enhanced reliability in challenging environments.
- Cost-effective: Hybrid PCBs are more affordable than using multiple conventional PCBs and related hardware.
Scope of Work:
The vendor will be responsible for fabricating and supplying multilayer boards, combining high Tg FR4 layers with other layers of high-frequency PTFE or hydrocarbon laminates. To qualify for space applications, the vendor must fabricate test samples for qualification in accordance with ISRO-PAX-304. SAC/ISRO will provide the pattern for the qualification samples and test coupons.
SAC/ISRO will perform qualification testing. Upon successful completion of the tests, the vendor will be certified as a qualified supplier of Hybrid MLBs for space use.
Typical Hybrid MLBs figures:
Four layer Construction: Rogers 4003C & Rogers 2929 Bondply
Ten layer Construction: Rogers 4003C & Isola 370HR:
