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http://dx.doi.org/10.7471/ikeee.2011.15.1.049

Compact Doppler Sensor Using Oscillator Type Active Antenna  

Yun, Gi-Ho (Dept. of Information and Communication Engineering, Sungkyul University)
Publication Information
Journal of IKEEE / v.15, no.1, 2011 , pp. 49-56 More about this Journal
Abstract
In this paper, a compact doppler sensor with oscillator type active antenna operating at 2.4GHz frequency band is proposed to measure the distance or speed of a moving object. The active antenna has been realized by oscillator using radiator, patch antenna, as its resonator. The oscillation frequency is shifted depending on approaching of the object, and a detection circuit discriminates the frequency deviation. The oscillator type active antenna has been designed and simulated. The prototype fabricated has a very small circular disk type of diameter 30mm and height 4.2mm. As for antenna performance, broadside radiation pattern with beamwidth of $130^{\circ}$ and oscillation frequency of 2.373GHz has been measured. Test results as a doppler sensor shows that doppler signal voltage of about 190mV has been obtained for conducting plate moving 1 meter away from the sensor. And, doppler signal voltage has been linearly increased to the ground from 4.5m height by free-falling the sensor.
Keywords
Doppler sensor; Active Antenna; Oscillator; Microstrip; Patch;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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