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

dear friends \^6[^\@[  
I want to know what's the relation between the antenna length and resonating frequency Dtd~}-_Q  
how can we determine the resonance frequency without any simulation or measurement just by looking at antenna dimension? =?$~=1SL+  
i.e in this antenna with this dimensions, do you know what is the resonating frequency? ;8oe-xS\+  
Is there any equation for this? dQT[pNp:  
thanks all. eL~xS: VT  
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[img]http://www.edabo .. L\UPM+tE  
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I don't think there is a specific relation between the antenna length and resonating frequency. _|US`,kfc  
generally, antennas with large dimensions have small resonating frequency. 0e<>2AL   
moreover, one antenna can have more than one resonating frequency, for example, broadband antennas. s8&q8r7%  
If there really exists a specific relation, I also want to know. !O%!A<3  

Dear zh_george j%s,%#al  
I read this issue in a book that: pgES)  
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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 3eE=>E4,  
geometry and the coaxial feed is located for a good 50  match." )nO ^Ay  
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this antenna must be resonating in about 400MHz but what's the relation between the length of radiator and ]0*aE  
the resonating frequency?! syBpF:`-W  
I'm so confused!

I don't know how to analyse the antenna. acS~%^"<_  
Maybe you can get some information from the current distribution on the radiator.

The current distribution is something like this: Zt41fPQ  
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and the E-field is like this but what we find from these?