Development trend on tunable microwave micro-antennas based on amorphous magnetic micro wires and application prospect on wireless sensing technology

摘要

The microwave detection has several advantages compared with other detection methods. Microwave sensors use Doppler radar to detect moving objects using microwaves. This differs from the method used by a regular infrared sensor as the microwave is sensitive to a variety of objects that can reflect microwaves, and its sensor readings are not affected by the ambient temperature. The unique magnetic properties of amorphous magnetic microwires (AMMW), in particular its interaction with microwaves by means of Giant Magnetoimpedance effect and its magnetostrictive character allow the development of tunable GHz micro-antennas useful as contactless sensing elements with applicability in many fields including biomedical, civil engineering, automotive intelligent cruise-control, etc.