| Presentation | 2011-12-09 Characteristics of FM-Band Cross-Talks between Two Parallel Signal Traces on Printed Circuit Boards with Separated Ground Patterns for Vehicles Michihira IIDA, Tsuyoshi MAENO, Jianqing Wang, Osamu FUJIWARA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | It is well known that electromagnetic disturbances in vehicle-mounted radios are mainly caused by conducted noise currents flowing through wiring-harnesses from vehicle-mounted printed circuit boards (PCBs) with common slitting ground patterns. To suppress these kinds of noise currents from PCBs, we previously measured them for simple two-layer PCBs with two parallel signal traces and slitting or non-slitting ground patterns. The results revealed that making slits with open ends on the ground patterns in parallel with the traces can reduce the conducted noise currents. Also it was found that a contributory factor for FM-band cross-talk reduction is the reduction of mutual inductance between the two parallel traces. Moreover, it was also interesting to note that the noise currents from PCBs can rather be suppressed despite the small size of the return ground. We then performed further FDTD simulation using eight simple two-layer PCB models in which the ground patterns were divided into two parts with different widths. The results showed that the cross-talk cannot always be reduced by widening the width of ground patters. In this study, to confirm the above findings, we made actual PCB samples with the same specification as the models used in the previous FDTD simulation, and measured cross-talks between the two parallel signal traces with respect to the different widths of ground patterns. As a result, we confirmed that the measured results agree with the FDTD simulation, and also that the cross-talks have the smallest values at specific spaces between the divided ground patterns. In order to clarify the latter result, we calculated cross-talks from a simplified equivalent circuit model consisting of inductances for the traces and ground patterns, and found that the circuit model can qualitatively explain the dependence of cross-talks on ground pattern width. The minimum reduction mechanism was found to come from the fact that a specific width of the ground pattern provides the smallest interlinking magnetic flux between the trace and the ground pattern. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | vehicle-mounted PCB / divided ground / cross-talks between two parallel signal traces / mutual inductance |
| Paper # | EMCJ2011-96 |
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| Conference Information | |
| Committee | EMCJ |
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| Conference Date | 2011/12/2(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Electromagnetic Compatibility (EMCJ) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Characteristics of FM-Band Cross-Talks between Two Parallel Signal Traces on Printed Circuit Boards with Separated Ground Patterns for Vehicles |
| Sub Title (in English) | |
| Keyword(1) | vehicle-mounted PCB |
| Keyword(2) | divided ground |
| Keyword(3) | cross-talks between two parallel signal traces |
| Keyword(4) | mutual inductance |
| 1st Author's Name | Michihira IIDA |
| 1st Author's Affiliation | DENSO COLORATION:Graduate School of Engineering, Nagoya Institute of Technology() |
| 2nd Author's Name | Tsuyoshi MAENO |
| 2nd Author's Affiliation | DENSO COLORATION |
| 3rd Author's Name | Jianqing Wang |
| 3rd Author's Affiliation | Graduate School of Engineering, Nagoya Institute of Technology |
| 4th Author's Name | Osamu FUJIWARA |
| 4th Author's Affiliation | Graduate School of Engineering, Nagoya Institute of Technology |
| Date | 2011-12-09 |
| Paper # | EMCJ2011-96 |
| Volume (vol) | vol.111 |
| Number (no) | 335 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |