caa a22 4500 477123139 CHVBK 20180405111642.0 cr unu---uuuuu 170330e19970101xx s 000 0 eng 10.1007/BF02677899 doi (NATIONALLICENCE)springer-10.1007/BF02677899 Tailoring the microwave permittivity and permeability of composite materials [Elektronische Daten] [Kenneth Bober, Robert Giles, Jerry Waldman] The microwave permittivity (ɛr) and permeability (µr) of composite materials are tailored by adding various loading agents to a host plastic and are subsequently modeled using the Maxwell Garnett theory and second order polynomials. With the addition of manganese zinc ferrite, strontium ferrite, nickel zinc ferrite, barium tetratitanate and graphite powders, materials with values of ɛ′, e″, µ′, µ″ as high as 22, 5, 2.5 and 1.7 have been obtained. Permittivity and permeability data are calculated at 2.0245 GHz from reflection and transmission measurements performed in a 7 mm coaxial test line. The Maxwell Garnett (MG) theory successfully models ɛr if the filling factor is less than 0.30 and ratio |ɛ1| (host)/ |ɛ2| (powder) is greater than 0.04. As this ratio decreases, the MG theory is shown to be independent of ɛ2 and second order polynomials are used to effectively model the dielectric constant. Polynomials are also used for the ferrite composites because it was determined that the MG theory was unable to model µr. This deficiency is attributed to the difference of domain structures that exist in powdered and sintered ferrites. Plenum Publishing Corporation, 1997 Bober Kenneth Submillimeter-Wave Technology Laboratory, University of Massachusetts, 01854, Lowell, Massachusetts aut Giles Robert Submillimeter-Wave Technology Laboratory, University of Massachusetts, 01854, Lowell, Massachusetts aut Waldman Jerry Submillimeter-Wave Technology Laboratory, University of Massachusetts, 01854, Lowell, Massachusetts aut International Journal of Infrared and Millimeter Waves Kluwer Academic Publishers-Plenum Publishers 18/1(1997-01-01), 101-123 0195-9271 18:1<101 1997 18 10762 https://doi.org/10.1007/BF02677899 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02677899 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bober Kenneth Submillimeter-Wave Technology Laboratory, University of Massachusetts, 01854, Lowell, Massachusetts aut NATIONALLICENCE 700 1- Giles Robert Submillimeter-Wave Technology Laboratory, University of Massachusetts, 01854, Lowell, Massachusetts aut NATIONALLICENCE 700 1- Waldman Jerry Submillimeter-Wave Technology Laboratory, University of Massachusetts, 01854, Lowell, Massachusetts aut NATIONALLICENCE 773 0- International Journal of Infrared and Millimeter Waves Kluwer Academic Publishers-Plenum Publishers 18/1(1997-01-01), 101-123 0195-9271 18:1<101 1997 18 10762 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer