Vol. 19

Front:[PDF file] Back:[PDF file]
Latest Volume
All Volumes
All Issues

Tunable Coplanar Waveguide (CPW) Line Integrating Bismuth Zinc Niobate (Bzn) Thin Films

By Young Chul Lee and Kyung Hyun Ko
Progress In Electromagnetics Research Letters, Vol. 19, 75-82, 2010


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.


Young Chul Lee and Kyung Hyun Ko, "Tunable Coplanar Waveguide (CPW) Line Integrating Bismuth Zinc Niobate (Bzn) Thin Films," Progress In Electromagnetics Research Letters, Vol. 19, 75-82, 2010.


    1. Sherman, V. O., T. Yamada, A. Noeth, N. Setter, M. Mandeljc, B. Malic, M. Kosec, and M. Vukadinovic, "Microwave phase shifters based on Sol-Gel derived Ba0.3Sr0.7TiO3 Ferroelectric thin films," Proceedings of the 37th European Microwave Conference, 1295-1298, 2007.

    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.

    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.

    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.

    5. Polcawich, R. G., D. Judy, J. S. Pulskamp, S. Trolier-McKinstry, and M. Dubey, "Advances in piezoelectrically actuated RF MEMS switches and phase shifters," IEEE MTT-S International Microwave Symposium Digest, 2083-2086, 2007.

    6. Choi, K., S. Courreges, Z. Zhao, J. Papapolymerou, and A. Hunt, "X-band and Ka-band tunable devices using low-loss BST Ferroelectric capacitors," International Symposium on the Applications of Ferroelectrics (ISAF), 1-6, 2009.

    7. Noda, M., Y. Sasaki, D. Popovici, M. Okuyama, and M. Komaru, "A 20 GHz MOD-made BST thin film tunable phase shifter for phase adjustment of digital 360-degree PHEMT phase shifter," IEEE MTT-S International Microwave Symposium Digest, 2005.

    8. Fu, C., W. Cai, H. Chen, S. Feng, F. Pan, and C. Yang, "Voltage tunable Ba0:6Sr0:4TiO3 thin films and coplanar phase shifters," Thin Solid Films, Vol. 516, 5258-5261, 2008.

    9. Giere, A., C. Damm, P. Scheele, and R. Jakoby, "LH phase shifter using Ferroelectric varactors," IEEE Radio and Wireless Symposium, 403-406, 2006.

    10. Kuylenstierna, D., E. Ash, A. Vorobiev, T. Itoh, and S. Gevorgian, "X-band left handed phase shifter using thin film Ba0.25Sr0.75TiO3 Ferroelectric varactors," European Microwave Conference, 847-850, 2006.

    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.

    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.

    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.