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Journal of the Korean Institute of Electromagnetic and Science 2006;6(1):1-9.
Piezo-controlled Dielectric Phase Shifter
Moon-Gi Jeong1, Beom-Jin Kim1, Victor Kazmirenko2, Yuriy Poplavko2, Yuriy Prokopenko2, Sung-Gi Baik1
1Dept. of Materials Science and Engineering, Pohang Univ. of Science & Technology (POSTECH)
2Dept. of Microelectronics, National Technical Univ. of Ukraine
A sandwich structure of dielectric material and air gap inside a rectangular waveguide is proposed as a fast electrically tunable low-loss phase shifter. As the dielectric material is shifted up and down by piezoelectric actuator and, thereby, the thickness of air gap is changed, the effective dielectric constant of the sandwich structure is varied. Phase shifters based on the sandwich structure with different dielectric materials showed phase shift of $20{sim}200^{circ}/cm$ at X-band as the thickness of air gap varied up to $30{mu}m$. The idea can be extended toward low-loss millimeter wave phase shifters since modem microwave ceramics have been developed to show very low dielectric loss$(tan;{delta}{sim}10^{-4})$.
Key words: Phase Shifter, Piezoelectric Actuator, Microwave Dielectric, Rectangular Waveguide
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