Crosstalk Reduction Strategies on UCPW Transmission Lines Supported by Real Application Data: Experimental Analysis of Point Capacity

Crosstalk between transmission lines, primarily caused by capacitive coupling, is a major challenge in high-frequency electronic systems, leading to signal integrity degradation. This study investigates the effectiveness of capacitors placed between ground planes in ungrounded coplanar waveguide (UCPW) transmission lines fabricated on FR4 circuit boards. A vector network analyzer (VNA) was used to measure near-end crosstalk (S31) reduction, with improvements of up to −40 dB observed. Experiments were conducted on transmission lines of 100 mm and 200 mm lengths, demonstrating the impact of capacitor placement on mitigating interference. The results indicate that this method provides a scalable and practical approach to improving signal integrity in compact, high-density electronic designs. These findings contribute to a deeper understanding of crosstalk mitigation strategies, offering valuable insights for applications in high-speed communication and RF circuit design. This work systematically analyzes the role of capacitor placement in reducing crosstalk, addressing a critical gap in the literature and paving the way for future advancements in transmission line optimization.