کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
738287 | 893998 | 2010 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Two-terminal ultrahigh frequency carrier type thin-film magnetic sensor using impedance matching lines Two-terminal ultrahigh frequency carrier type thin-film magnetic sensor using impedance matching lines](/preview/png/738287.png)
This article reports on output and band characteristics of the two-terminal ultrahigh frequency (UHF) carrier type magnetic field sensor, which is based on impedance change due to magnetic field dependent permeability, and a magnetic field is detected as an amplitude modulation of a UHF carrier voltage. Two types of transmission line configurations (type-A and type-B) are proposed to make a two-terminal sensor rather than the four terminals of the conventional sensor operating on this principle, because the two-terminal sensor is more advantageous in terms of designing and fabricating of the sensor element and the transmission lines than the four-terminal sensor. In the type-A, a half-wave impedance matching line is added between the element and the carrier power supplying points. Also, in the type-B, a carrier power is supplied on the quarter-wave matching line located between the element and the load. The type-A sensor exhibits a lower output and a much narrower 3 dB-bandwidth of a few tens of MHz than the four-terminal sensor. In contrast, a higher output than that in the four-terminal sensor and a 3 dB-bandwidth of ∼100 MHz are confirmed in the type-B sensor by experiments and calculations.
Journal: Sensors and Actuators A: Physical - Volume 157, Issue 1, January 2010, Pages 19–25