Magnetic microbeads have acquired broad scope in immunoassay applications to detect pathogens causing dreadful diseases. In this work, we propose magnetic sensors using non-spiral planar microcoils to sense the presence of the microbeads with better sensitivity and fabrication simplicity. Experiments are performed by measuring the current induced in the sensing coil in the presence of iron oxide microbeads. Meanwhile, simulation studies of the sensors are conducted to verify the experimental results. A comparison of the proposed and the reported works on planar coil sensors are also presented. Improved limit of detection with reduced power consumption is observed to be the significant advantage of the induction-balance and differential sensors compared to the reported works.

磁性微珠在免疫测定应用中获得了广泛的应用，以检测引起可怕疾病的病原体。在这项工作中，我们提出了使用非螺旋平面微线圈的磁性传感器，以更好的灵敏度和制造简单性来检测微珠的存在。通过测量在氧化铁微珠存在的情况下感应线圈中感应的电流来进行实验。同时，对传感器进行仿真研究以验证实验结果。还介绍了对平面线圈传感器的建议和报告工作的比较。与报告的作品相比，感应平衡和差分传感器的显着优势是通过降低功耗提高检测限。