Electrically Tunable Phase Shifters with Air-Dielectric Sandwich Structure
POHANG UNIV OF SCIENCE AND TECHNOLOGY (REPUBLIC OF KOREA) DEPT OF MATERIALS SCIENCE AND ENGINEERING
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Electrically tunable microwave phase shifter was developed by inserting dielectric slab and piezoelectric actuator inside a waveguide. Air-dielectric sandwich structure of dielectric material and thin air gap was placed inside a waveguide, where the thickness of air gap is controlled by the actuator. Small changes in the ratio between the thickness of dielectric material and air gap induce significant changes in the effective dielectric constant of the air-dielectric sandwich structure. Phase shifts of 20 200 degrees were realized with the dielectric materials such as Mg, CaTiO3 while the thickness of air gap is changed between 0 to 30 micrometers by piezoelectric control. Since the dielectric ceramics has very small loss tan delta 10 exp-4 and the air gap has practically no loss, the total structure shows low insertion loss.
- Physical Chemistry
- Electricity and Magnetism
- Radiofrequency Wave Propagation