Abstract
Microwave absorbing material was prepared using epoxy resin as matrix and spherical carbonyl iron powder (s-CIP), flaky carbonyl iron powder (f-CIP) as absorbing agent. Microwave absorbing, mechanical properties and structure of the composites containing different kinds of carbonyl iron powder (CIP) were investigated. The results show that the microwave absorber with flaky CIP have better electromagnetic properties than composites with spherical CIP. With concentration of spherical CIP increasing the electromagnetic properties of composites becomes better, except for the mechanical performance. The flaky CIP/epoxy resins composites with a loading of 79 wt% plate-like CIP has attenuation constant of 25.443 dB/cm in 3 GHz. The absorber prepared using flaky CIP has homogenous, dense structure and has excellent mechanical properties.
Highlights
Splitter is a kind of device that can separate multiple signals into a single frequency band
In order to overcome the drawbacks of spherical carbonyl iron powder (s-Carbonyl iron powder (CIP)), we prepare flake-like CIP/epoxy resins composites which have excellent electromagnetic properties
The epoxy resin and curing agent were stirred with dibutyl phthalate/acetone mixture to form a homogeneous solution by a 1 h mechanical stirring at room temperature
Summary
Splitter is a kind of device that can separate multiple signals into a single frequency band It is an indispensable component in all kinds of microwave subsystem[1,2]. The absorption load is used to absorb the excess microwave and stabilize the system signals, especially in S-band It is a key component of the splitter. Carbonyl iron powder (CIP), as a representative of excellent performance absorbing agent, has high magnetic permeability, good temperature stability and its industrial production technology is mature. It is one of the absorbing material which have been got the most research[3,4,5]. It is supposed that the morphology and structure have a significant impact on the absorbing properties of materials, especially for the splitter load
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