915MHz和2450MHz下扇贝柱介电特性的研究

Study on the dielectric properties of scallop adductors at frequency of 915MHz and 2450MHz

摘要: 利用介电网络分析仪测量温度20~100℃,频率0.3~3GHz下扇贝柱介电常数和介电损耗因数,从而得出扇贝柱在微波加热过程中温度和频率对介电特性的影响。结果表明,温度一定时,介电常数和介电损失因数都是先随着频率增加而降低,随后变化不显著;频率915MHz和2450MHz时,介电常数与温度成负相关,介电损耗因数与温度成正相关。且915MHz和2450MHz下,穿透深度随温度的升高而减小。扇贝柱介电特性的研究为微波杀菌技术的研究提供了理论基础。

Abstract: The dielectric constant and dielectric loss factor of scallop adductors were measured by the RF network analyzer over the frequency range of 0.3³GHz from the temperature 20℃ to 100℃.The effect of temperature and frequency on dielectric properties during microwave heating was found. The results showed that the dielectric constant and dielectric loss factor decreased with the growing of frequency at first at the same temperature, then they didn't change significantly.At frequency of 915MHz and 2450MHz, there was a negative correlation between the dielectric constant and temperature while the dielectric loss factor was positively correlated to temperature.In addition, the penetration depth decreased as temperature was growing.Study on the dielectric properties of scallop adductors provided theoretical basis for microwave sterilization.