The transmission line structures such as coplanar waveguide （CPW） and microstrip ring resonator （MRR） were designed on a high-purity quartz substrate （99.9997%） with a thickness of 127 μm. The average insertion loss for the CPW line varied from 0.096 to 0.176 dB/mm in the frequency range of 40-110 GHz. Furthermore， the relative permittivity and loss tangent of the quartz were extracted by the MRR method. The relative permittivity of the quartz substrate in the V-band and W-band ranged with 3.7-3.85 and 3.85-4， respectively. The loss tangent value was approximately 0.004 in the V-band and 0.004-0.006 in the W-band. The performance comparison with other substrates shows that this high-purity quartz has excellent and stable electrical properties and its potential for designing high-performance passive and packaging structures.