An inorganic circuit board article including: a porous inorganic sheet having a low dielectric loss of from 1×10−5 to 3×10−3 at a high frequency of from 10 to 30 GHz and the porous inorganic sheet has a percent porosity of from 30 to 50 vol %; a dielectric polymer having a low dielectric loss of from 10−4 to 10−3 at a high frequency of from 10 to 20 GHz, wherein the dielectric polymer occupies the pores of the porous inorganic sheet, and the inorganic circuit board article has a dielectric loss of from 1×10−4 to 9×10−4. The disclosure also includes methods of making and using the inorganic circuit board article.