Noise Coupling and Shielding Structures for Glass Core Substrate

Abstract

Despite the low dielectric constant and minimal loss of glass substrates, noise coupling remains a challenge in high-frequency, high-density interconnects. In this letter, six noise shielding structures are proposed, and a simplified TGV noise coupling circuit model is developed to estimate their effectiveness. Seven test vehicles were fabricated for comparison, and good agreement was observed between the measured, simulated, and estimated results. This analysis effectively estimates noise coupling without the need for complex simulations. Noise suppression improvements of 20 dB at 40 GHz and 35 dB at 60 GHz were achieved with the guard rings, significantly outperforming traditional techniques. A 40 dB reduction in noise at 60 GHz was achieved with the guard trenches. Proposed shielding structures and evaluation methods can be applied to noise coupling in future millimeter-wave broadband glass core substrate integration.