[求助]What's the relation between antenna length and resonating frequency?

dear friends xI-=tib  
I want to know what's the relation between the antenna length and resonating frequency >cBGw'S  
how can we determine the resonance frequency without any simulation or measurement just by looking at antenna dimension? u-8X$aJ  
i.e in this antenna with this dimensions, do you know what is the resonating frequency? ( [K2:n\  
Is there any equation for this? XhQw+j~1.  
thanks all. J(3gT}z-  
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[img]http://www.edabo .. lNq:JVJ#\r  
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I don't think there is a specific relation between the antenna length and resonating frequency. U- *8%>Qp
 
generally, antennas with large dimensions have small resonating frequency. #x4h_K Y  
moreover, one antenna can have more than one resonating frequency, for example, broadband antennas. n!l./>N  
If there really exists a specific relation, I also want to know. ]2aYi9)  

Dear zh_george da?th  
I read this issue in a book that: 0)`lx9&h  
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"The length of the spiral radiator is determined for the antenna to resonate at the desired frequency (402–405 MHz) in the FDTD Y"/UYxCm|&  
geometry and the coaxial feed is located for a good 50  match." SJ[@fUxO)  
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this antenna must be resonating in about 400MHz but what's the relation between the length of radiator and syNb0LR  
the resonating frequency?! 
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I'm so confused!

I don't know how to analyse the antenna. O/^w! :z'  
Maybe you can get some information from the current distribution on the radiator.

The current distribution is something like this: ^Jc0c)*  
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and the E-field is like this but what we find from these?