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本文用短路开路法在8～12.4GHz频率范围内,对有机导电高聚物的微波吸收特性与掺杂剂的性质、室温电导率和试样厚度等参量的关系进行了研究。实验结果表明:当导电聚合物的电导率为10~(-3)<σ<10~(-1)S/cm时,为半导体,具有较好的微波吸收特性。发现其最大衰减和介电常数ε_r随电导率的增加而增加,而磁导率μ_r却与电导率无关;同时,磁损耗均小于电损耗。这有力表明这类导电高聚物的吸波原理似电损耗型。它可作为具有优异吸波性能、密度小和价格便宜的新型微波吸收剂。其平均衰减约10dB,最大衰减可达36dB,表减10dB时的频宽可达3.0GHz。
In this paper, the relationship between the microwave absorption characteristics of organic conductive polymers and the properties of dopants, the conductivity at room temperature and the thickness of the sample were investigated by short circuit open method in the frequency range of 8 ~ 12.4GHz. The experimental results show that when the conductivity of the conductive polymer is 10 -3 (σ) <10 -1 S / cm, it is a semiconductor and has good microwave absorption characteristics. It is found that the maximum attenuation and permittivity ε_r increase with the increase of conductivity, while the permeability μ_r has nothing to do with the conductivity; at the same time, the magnetic loss are less than the electrical loss. This is a strong indication that the principle of wave absorption of such conductive polymers is lossy. It can be used as a new microwave absorber with excellent absorbing properties, low density and low price. The average attenuation of about 10dB, the maximum attenuation of up to 36dB, the table by 10dB bandwidth up to 3.0GHz.