Agilent / Keysight 85072A 10-GHz Split Cylinder Resonator

The Agilent/Keysight 85072A is a precision split cylinder resonator operating at 10.03 ± 0.03 GHz, designed for accurate measurement of dielectric properties in thin, flat, and low-loss sheet materials. It measures complex permittivity (ε’) and loss tangent (tanδ) in compliance with IPC-TM-650 test method 2.5.5.13, serving research, development, and quality control laboratories. The instrument employs diamond-turned aluminum cylinders plated with copper and gold, achieving a Q factor ≥ 20,000 in the TE011 mode at -50 dB input coupling. Sample thickness accommodates 0.1 mm to 3 mm (up to 5 mm with reduced accuracy), with minimum dimensions of 56 mm, preferably 60 mm or greater. An integrated digital micrometer enables precise thickness measurement during testing. The kinematic mount ensures rigid alignment critical for high-Q cavity operation and loss tangent resolution. Samples must be non-magnetic, homogeneous, and possess uniform thickness with flat parallel sides. Integration with a Keysight vector network analyzer, associated cables, and resonant cavity software is required for complete system operation.