有會(huì)用HFSS軟件的嗎？關(guān)于電磁建模

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本人在做電磁建模分析，用hfss  V13版本軟件，在添加端口激勵(lì)時(shí)一直顯示不成功.提示如下，求解決之道

0 @8 j2 V2 C! @( ^3 p, C+ C    [error] Terminals cannot be assigned because either there are no conducting objects or all conducting objects have been designated as terminal reference conductors. (5:52:26 ÏÂÎç  5ÔÂ 21, 2013)
    [error] Terminals cannot be assigned because either there are no conducting objects or all conducting objects have been designated as terminal reference conductors. (5:54:42 ÏÂÎç  5ÔÂ 21, 2013)
+ h% D# m% i; J& K1 e( r    [error] Terminals cannot be assigned because either there are no conducting objects or all conducting objects have been designated as terminal reference conductors. (6:03:57 ÏÂÎç  5ÔÂ 21, 2013)
2 g- @) W2 v* W# [/ u2 [; Q