18GHz TNC-RA high performance microwave cable assemblies use TNC right angle connector with 90° center conductor structure, which has higher working frequency, better VSWR and more stable and reliable performance than non-90° center conductor structure connector. The product is matched with B12Y which is ultra-low loss cable with a diameter of 4.9mm and excellent phase stability over flexure and temperature, has lower loss, high performance, is suitable for kinds of connection of microwave equipment, test instruments and modules.