Interesting coupling logic of feeding network resonator

yefj
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Hello,I have built a resonator which consists from 64 gap coupled small resonators. I have 4 resonances 5.7Ghz (the strongest coupling) 6.25Ghz 6.78Ghz 7.172Ghz as shown below . the coupling of the resonances getting smaller as the frequency rises. Is there a way to increase the coupling on the 6.78Ghz resonance?
Thanks.
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