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2.4G倒F天线在HFSS下的仿真

各位工程师们好!

        我在HFSS下对TI提供的倒F天线进行仿真,仿真完成后,发现谐振频率不在2.4G,而是在2.2左右,电阻值也是在2.2G下为50欧姆,然后在书上看到,说改变天线的谐振长度,会提高天线的谐振频率,但是我在HFSS下输入不同的值,发现L的长度的不影响谐振频率,请问是怎么回事?