[建模]I need urgent help about implanted PIFA antennas

dear friends *aGJ$ P0  
 I performed a simulation for a PIFA antenna embedded in a tissue model.this antenna designed for 402-405MHz but I face with a bad S_Parameter result. 1E0!?kRK  
how can I improve it? 28 zZ3|Z3  
I attached the antenna configuration and the properties of the tissue. #L&/o9|  
It's so urgent for me. =>@ X+4Kb  
t .. Uz%ynH  
.fS{j$  

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如果PDF里的图6.6不是CST软件仿真出来的，有些差异是能够接受的哈。我觉得你的仿真结果更接近实测结果。

Dear Charles.l o31pF  
Thanks for your reply. "=9)|{=m  
I'm so confused because I think it's better to resonate at 402-405MHz(i.e medical frequency band)with -10dB of S11,is'nt it? $yMNdBI[  

呵呵，你的文件我看不太懂，我打开了文件，只有PDF我才看懂一点，你使用的是陶瓷板么？我是觉得挺不错的，如果你考虑用其它的介质板不太了解，我们可以互相沟通下，这只是我的建议！

Dear friend c[4H  
I just want to know how can I improve my S-parameter result? .6yC' 3~;o  
in the below picture you can see the  correct result and my results together. jj,Y:  
the first one is the correct result and the second one is my result. `Tx1?]  
it should  be work in 402-405MHz.(i.e -10dB S parameter should be in this frequency band) 8kz7*AO  
so,how can I improve it? er Cl@sq
 
H=OKm  

I think that you can chage the locations of short point and feed point .  Try it.

Dear james *m_B#~4  
the positions of the feeding and short pin are as the below picture 3R!?r^h  
do you think that it may be wrong? ~@8r-[  
anyway, thanks for your view.   3\J-=U  
I do my best and change the short pin and feeding together and report the result. rp*f)rJ  
vb 2mY  

I used a parametric sweep and changed the short pin location and then got the following result : CG`s@5y>5  
I think it's a good resonating for 402-405MHz. QA=G+1x  
but there is another important question,yet. 1$Jria5n  
in the main reference in which I found this antenna the location of short pin is not a correct location
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why the  writers of that paper determine the short pin location dishonesty? >u6*P{;\  
Do I make a mistake?

楼主你这个问题解决了吗？没有的话，能把你的附件改成ZIP格式吗？

The problem has solved. P]H
cg|&  
Thanks to all the dear friends.