Agilent 5991-4716EN Materials Measurement Phantoms - Application Brief c20140717 [4] free download

File name 5991-4716EN Materials Measurement_ Phantoms - Application Brief c20140717 [4].pdf

Keysight Technologies Materials Measurement: Phantoms Application Brief 02 | Keysight | Materials Measurement: Phantoms - Application Brief Overview Solution Phantoms (designed objects that simulate various constants of The coaxial probe method is best for liquid phantom materials. biological tissues) have been widely used for antenna character- A typical measurement system consists of a network analyzer or istic evaluation and specific absorption rate (SAR) measurements an impedance analyzer, a coaxial probe and software. Keysight for mobile handsets and other wireless communication devices. offers the whole product solution, the 85070E software with the There are international test standards for SAR measurements dielectric probe kit (included), an Keysight network analyzer or to protect human health and safety such as IEC 62209. The test the E4991A impedance analyzer. The system provides simple, standards require measuring dielectric properties of the phantom convenient and non-destructive measurements. The measure- material, such as relative permittivity and conductivity, prior to ment software guides you through setup and measurement, in- testing SAR. stantly converting S-parameter network analyzer data into a data format of your choice and displaying the results within seconds. Phantoms are also increasingly required for a variety of medical Results can be charted in a variety of formats: r', r ", tan and research purposes such as microwave imaging to detect breast Cole-Cole. The system can cover from 10 MHz to 50 GHz. The cancers. It uses the difference of microwave reflectivity between frequency range is decided by analyzer. normal tissue and cancer tissue due to different dielectric proper- ties. Researchers need to verify that the dielectric properties of phantom materials are equivalent to that of biological tissues for getting precise test data. Problem The dielectric characteristics of liquid phantom tend to be changeable by evaporation and chemical reaction over time. The test standards require the measurement of dielectric properties of phantom material within a certain period of time (e.g. within 24 hours) before SAR testing. For measuring dielectric proper- ties within a short time period, an easy-to-setup, repeatable, and stable test system is required. The required test frequency ranges for medical research purposes are being increased up to 10 GHz Figure 1. Typical system configuration and higher. You may need to monitor dielectric properties for many hours, e