This paper describes the design, fabrication and test results of a family of integrated low-voltage ferroelectric phase shifters ranging in frequency of operation from 0.7 GHz to 6 GHz. All devices use a common material system of barium strontium titanate (Ba/sub x/Sr/sub 1-x/TiO/sub 3/ or BST) thin-films on a sapphire (Al/sub 2/O/sub 3/) substrate. Thick copper (Cu) metallization is used to allow integration of ferroelectric varactors with high-Q inductors and other passive microwave elements. Novel bias structures have also been developed to reduce the voltages required to tune the materials to less than 20V. The flip-chip mounted devices measure less than 0.080 in. /spl times/ 0.080 in.. Data for an all-pass network BST phase shifter shows that more than 100/spl deg/ of differential phase shift may be obtained over a 30% fractional bandwidth. To demonstrate the utility of BST phase shifters, a two-element phased array antenna was designed and tested in conjunction with a wireless local area network (WLAN). Field tests showed that the data throughput of the WLAN was significantly improved in the presence of strong interference by use of the BST phased array antenna.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Low-voltage ferroelectric phase shifters from L- to C-band and their applications


    Contributors:
    Stevenson Kenney, J. (author) / Yong Kyu Yoon, (author) / Minsik Ahn, (author) / Allen, M.G. (author) / Zhiyong Zhao, (author) / Xiaoyan Wang, (author) / Hunt, A. (author) / Dongsu Kim, (author)

    Published in:

    Publication date :

    2006-01-01


    Size :

    1152342 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Coplanar Phase Shifters Based on Ferroelectric Thin Films

    Fu, C. / Pan, F. / Chen, H. et al. | British Library Online Contents | 2007


    Special Issues and Features of a Scanning Reflectarray Antenna Based on Ferroelectric Thin Film Phase Shifters

    Romanofsky, R. R. / European Space Agency | British Library Conference Proceedings | 2006




    Analysis of Surface Micro Machined RF MEMS Phase Shifters

    Janardhana, V. | Online Contents | 2008