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In the RF world (particularly at mm-wave frequencies), even copper has very non-negligible losses. In most passive circuits conductor loss is the limiting factor of performance. No idea if this material retains the same properties at such frequencies, and is compatible with typical lithography or other fabrication techniques, but it'd be amazing if so.

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Particle accelerators sometimes use superconducting niobium resonators at e.g. 1.8K offering a Q of 5e10 at 1.3 GHz. But apparently their surface resistance scales with the square of frequency, unlike the square root in normal copper.

So maybe just just t normal conductors like copper, silver, graphene (assuming the latter can be commercially made to surpass silver in RF surface resistance).

Silver is very good for RF power work, so good that I doubt that anything will be able to supplant it on a cost basis because you only need a tiny little bit of it to plate your copper carrier to get really good results. Obviously not perfect, there is still some resistance but it's hard to compete with because of the combination of properties in terms of ductility, flexibility, resistance to deep corrosion and so on.

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