Open AccessMICROWAVE VECTOR REFLECTOMETER USING SELF-MIXING OSCILLATOR ANTENNAS
Author(s) -
P. Yoiyod,
Monai Krairiksh
Publication year - 2015
Publication title -
latin american applied research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.123
H-Index - 23
eISSN - 1851-8796
pISSN - 0327-0793
DOI - 10.52292/j.laar.2015.398
Subject(s) - circulator , microwave , materials science , dielectric resonator , gunn diode , dielectric , optics , mixing (physics) , resonator , optoelectronics , diode , antenna (radio) , electrical engineering , physics , engineering , telecommunications , quantum mechanics
This paper presents a microwave reflectometer using self-mixing oscillator antennas. A unique characteristic of the proposed reflectometer is its simple structure without a circulator and a directional coupler. Each self-mixing oscillator antenna utilizes a Gunn diode as an active device and a rectangular waveguide as a resonator and a radiator. The determination of dielectric properties of materials was carried out at 9.79 GHz and the measured results using the proposed reflectometer were in good agreement with those by a dielectric probe. In addition, the reflectometer has several industrial applications, e.g. fruit classification, moisture content sensing, etc.