基于FDC工艺的介电常数可控介质及其在天线中的应用

Permittivity-Controllable Dielectric Based on Fused Deposition of Ceramics and Its Application in Helical Antenna

本文提出了一种通过陶瓷熔融沉积成型(FDC)工艺制备的介电常数可控介质。采用由聚烯烃和二氧化钛制成的FDC丝材打印出圆柱形样品并测试其微波特性。研究发现,通过调节打印过程中的填充率和流量率,可以将打印样品的相对介电常数从2变化到6。此外,测试结果表明,样品的损耗角正切值很低,该FDC丝材是一种适用于微波领域的材料。在此基础上,利用FDC工艺和介电常数可控介质,以宽带圆极化介质螺旋天线为例进行了制备和测试。研究表明,可以利用FDC工艺方便地制造出具有复杂结构的介质微波器件。

This paper proposes a study of the permittivity-controllable dielectric manufactured by fused deposition of ceramics(FDC).The FDC filament made of polyolefin and titanium dioxide is here utilized to fabricate cylindrical samples and the microwave characteristics of these samples are subsequently measured.It is found that the relative permittivity of the printed sample can be tuned from 2 to 6 by adjusting the infill density of the sample and the flow rate of the nozzle.Besides,measured results show that the FDC filament possesses the low value of loss tangent and it is a suitable material for microwave field.Based on FDC and the dielectric with designable permittivity,a wideband circularly polarized(CP)dielectric helical antenna serving as an example is fabricated and tested.All these findings demonstrate that FDC can be leveraged to conveniently fabricate sophisticated dielectric microwave components.