Testing and Measurement
Emerson & Cuming Microwave Products utilizes electromagnetic test equipment and fixtures to fully characterize various performance metrics of materials. A state of the art precision network analyzer capable of performing measurements up to 67 GHz is used to perform precise measurements of all EM aspects of materials.
Electromagnetic characterization of materials begins with parameter measurements. Parameters are the complex permittivity and permeability of materials as a function of frequency. ECMP has test fixtures to measure full electromagnetic parameters from 1 MHz to 67 GHz.
Reflectivity is a core metric for many materials. Reflectivity is defined as the reduction in reflected power caused by the introduction of the absorber material and is generally measured in free space using an NRL arch. ECMP utilizes arches covering frequencies from 600 MHz to 67 GHz.
Insertion loss is a direct measurement of the lossiness of an absorber. ECMP can measure insertion loss from 2-67 GHz
Dielectric constant and loss tangent is measured precisely using interferometric techniques and a Split Post Dielectric Resonator (SPDR)
Cavity resonance suppression is a key function of microwave absorbers. ECMP tests the resonance suppression effectiveness of various absorber materials using an L band and an X band cavity.
Absorbers designed for near field noise suppression are tested for inter-decoupling and intra-decoupling using fixed loop antennas and for radiation suppression using a custom microstrip line.
Proper design of a read on metal RFID tag requires accurate characterization of the tag antenna impedance. ECMP uses an impedance probe for this measurement.