volume | PIER Journals

Abstract

In this paper, a tunable coplanar waveguide (CPW) line using the bismuth zinc niobate (BZN) thin film has been proposed and demonstrated for low-voltage phase shifter applications. In order to reduce the operation bias voltage the air gaps between the signal strip and ground plane are filled with the tunable thin films. At low E-fields of 1.3 kV/cm, the fabricated CPW line shows the phase difference of 10 degree at 10 GHz.

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2. Ko, K. H., D. H. Back, Y. P. Hong, and J. H. Moon, "Phase decomposition and dielectric properties of reactively sputtered bismuth zinc niobate pyrochlore thin films deposited from monolclinic zirconolite target," Journal of Electroceramics, Vol. 1, 171-175, 2005.
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3. Lee, Y. C., Y. P. Hong, D. M. Kim, and K. H. Ko, "Very high tunable inter-digital capacitor using bismuth zinc niobate thin-film dielectrics for microwave applications," IEE Electronics Letters, Vol. 42, No. 15, 851-853, 2006.
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4. Lee, Y. C., Y. P. Hong, and K. H. Ko, "Low-voltage and high-tunability interdigital capacitors employing lead zinc niobate thin films," Appl. Phys. Lett., Vol. 90, 182908, 2007.
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10. Kuylenstierna, D., E. Ash, A. Vorobiev, T. Itoh, and S. Gevorgian, "X-band left handed phase shifter using thin film Ba_0.25Sr_0.75TiO₃ Ferroelectric varactors," European Microwave Conference, 847-850, 2006.
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11. Moon, S. E., H. C. Ryu, M. H. Kwak, Y. T. Kim, S.-J. Lee, and K.-Y. Kang, "X-band phased array antenna using Ferroelectric (Ba, Sr)TiO₃ coplanar waveguide phase shifter," ETRI Journal, Vol. 27, 677-684, 2005.
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12. Chun, Y.-H. and J.-S. Hong, "A novel tunable transmission line and its application to a phase shifter," IEEE Microwave and Wireless Components Letters, Vol. 15, No. 11, 784-786, 2005.
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13. Lee, Y.-L., H.-S. Youn, C. Tanaka, W. Kim, and M. Iskander, "Design, development and experimental verification of voltage tunable ferroelectric coplanar phase shifters," IEEE Antennas and Propagation Society International Symposium (APSURSI), 1-4, 2010.

14. Hwang, S.-H., T. Jang, Y.-S. Bang, J.-M. Kim, Y.-K. Kim, S. Lim, and C.-W. Baek, "Tunable composite right/left-handed transmission line with positive/negative phase tunability using integrated MEMS switches," IEEE International Conference on Micro Electro Mechanical Systems (MEMS), 763-766, 2010.
doi:10.1109/MEMSYS.2010.5442296

Prof. Young Chul Lee

Dr. Kyung Hyun Ko