Miniaturized antennas on novel magneto(di)electric substrates.

摘要

In this paper we have examined the properties of high permittivity magneto(di)electric materials, and their uses in antenna applications. In particular, we have used these materials to counteract the narrowing of bandwidth, and the impedance mismatch due to the use of high permittivity ceramics as antenna substrates by themselves [1-6]. We have shown on a variety of different antennae how utilizing magnetic films can help to improve the antennas performance be it through bandwidth, directivity, or gain. These results include HFSS simulations, as well as fully experimentally tested and fabricated antennae.;To achieve these substrates, we have also examined the properties and fabrication process of a wide range of materials. These materials include metallic thin films such as (Fe60Co40)85B 15 and (Fe1-xGax)85B15 [7-10] as well as and spin spray (Ni1-xCox)Fe2O 4 and (Ni1-xZnx)Fe2O4 ferrite materials [11]. In putting together these results we performed many different measurements on these films in regards to their thermal stability, magnetization and optimal thicknesses. We also examine the high permittivity ceramics themselves in detail to determine the conditions for their fabrication, and their optimization [12-14].;Together all of these materials have been used to observe miniaturization and significant enhancement of our antenna designs [15-18].