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Using spiral inductor after SRF

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pragash

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I'm designing bandpass filter at 2.5GHz in PCB board. I'm using lumped component for all the capacitors and designing spiral inductors in PCB. Those spirals seeing negative inductance when i optimize the design. please let me know if i use negative inductance in my RF filter design and what is the impact.

negative inductance is because im using the spiral after the SRF.
 

my off the top of my head comment would be: if you end up needing negative inductance inductors in your filter, you must have way too much parasitic inductance/transmission line length in your layout. At 2.5 GHz...things have to be SMALL, or they act like transmission lines instead of lumped elements.
 
to reduce parasitics inductance, i have to use short and thicker traces right? any guideline for designing characteristic impedance of the interconnects at 2.5GHz?
 

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