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Currently, the drivers are able to control a door lock at a distant point from a vehicle. Recently, a door lock system has been developed to detect an owner approaching and to unlock the door when he/she touches the door handle. In this system, an antenna detects the existence of the owner with an electrical key near the vehicle. Since this detection performance of the antenna (directivity) varies in the operating area, it is essential to recognize directivity and confirm that there is unoperating area. In this report, we describe an example of predictive calculation on directivity of an antenna using the electromagnetic field analysis.

The reduction of brake squeal is an important technological subject in terms of making vehicles quieter. We analyzed vibration characteristics of disk brake calipers in detail during generating brake squeal, and identified some places Which influence the brake squeal. A simplified method of brake squeal test by vibration response analysis was examined.