Improving impedance matching of flaky carbonyl iron based on the surface modification by binary coupling agents

In this paper, the impedance matching of flaky carbonyl iron was improved by surface modification with binary coupling agents. The microstructure, phase and electromagnetic parameters were detected Scanning electron microscope (SEM), X-ray diffraction (XRD) Agilent vector network analyzer, respectively. After agent applied, shape particle size (CIP) have changed significantly, whereas remained $${\alpha }$$ -Fe phase. On other hand, addition agents, complex permittivity CIP is reduced, which beneficial to matching. doping 2wt% calcium stearate 2 ml titanate has a minimum reflection loss peak − 13 dB at thickness mm. It noted that effective absorption bandwidth (RL < -10 dB) up 0.8 GHz (1.8 ~ 2.6 GHz). Moreover, magnetic tangent samples can be significantly Therefore, make get better absorbing performance in S band.