同軸線饋電 objects substrate and feed intersect

微帶貼片天線的設計時，介質基板分有三層，上下兩層用羅杰斯的板子中間用空氣層，采用的是同軸線饋電方式，同軸內芯用pec導體材料，同軸圓柱體穿過三層介質基板，仿真時提示出錯
objects "substrate11" and "feed" intersect
objects "substrate2" and "feed" intersect
objects "substrate12" and "feed" intersect
substrate11 substrate12 是上下兩層羅杰斯的板子 substrate2是空氣層 feed為同軸饋線
請問是為什么

介質層沒有減去feed