In this letter, a modified broadband 90° phase shifter is proposed. By using a dentate microstrip and a patterned ground plane, an extremely tight coupling can be obtained, and consequently a constant phase shift over a wide bandwidth can be achieved. To verify the proposed idea, a topology is implemented, the measured results of a phase difference of 90 ± 5° in 79.5% bandwidth, better than 10 dB return loss across the whole operating band, are also given. The measurement results agree well with the full-wave electromagnetic simulated responses.
2. Meschanov, V., I. Metelnikova, V. Tupikin, and G. Chumaevskaya, "A new structure of microwave ultrawide-band differential phase shifter ," IEEE Trans. Microw. Theory Tech. , Vol. 42, No. 5, 762-765, 1994.
doi:10.1109/22.293522
3. Schick, B. and J. Kohler, "A method for broad-band matching of microstrip differential shifters," IEEE Trans. Microw. Theory Tech., Vol. 25, No. 8, 666-671, 1977.
doi:10.1109/TMTT.1977.1129183
4. Quirarte, J. and J. Starski, "Novel Schiffman phase shifters," IEEE Trans. Microw. Theory Tech., Vol. 41, No. 1, 9-14, 1993.
doi:10.1109/22.210223
5. Naser-Moghadasi, M., G. R. Dadashzadeh, A. M. Dadgarpour, F. Jolani, and B. S. Virdee, "Compact ultra-wideband phase shifter," Progress In Electromagnetics Research Letters, Vol. 15, 89-98, 2010.
doi:10.2528/PIERL10032606
6. Guo, Y.-X., Z.-Y. Zhang, and L. C. Ong, "Improved wide-band Schiffman phase shifter," IEEE Trans. Microw. Theory Tech., Vol. 54, No. 3, 1196-1200, 2006.
doi:10.1109/TMTT.2005.864105
7. Abbosh, A. M., "Ultra-wideband phase shifters," IEEE Trans. Microw. Theory Tech., Vol. 55, No. 9, 1935-1941, 2007.
doi:10.1109/TMTT.2007.904051
8. Eldek, A. A., Wideband 180 degree phase shifter using microstrip-CPW-microstrip transition, Progress In Electromagnetics Research B, Vol. 2, 177-187, 2008.
doi:10.2528/PIERB07111507
9. Wang, Z. G., B. Yan, R. M. Xu, and Y. C. Guo, "Design of a ku band six bit phase shifter using periodically loaded-line and switched-line with loaded-line," Progress In Electromagnetics Research, Vol. 76, 369-379, 2007.
doi:10.2528/PIER07071904
10. Jahanbakht, M., M. Naser-Moghaddasi, and A. A. Lotfi Neyestanak, "Fractal beam ku-band mems phase shifter ," Progress In Electromagnetics Research Letters, Vol. 5, 73-85, 2008.
doi:10.2528/PIERL08101703
11. Afrang, S. and B. Yeop Majlis, "Small size ka-band distributed mems phase shifters using inductors," Progress In Electromagnetics Research B, Vol. 1, 95-113, 2008.
doi:10.2528/PIERB07101903
12. Quirarte, J. L. R. and J. P. Starski, "Synthesis of Schiffman phase shifters," IEEE Trans. Microw. Theory Tech., Vol. 39, No. 11, 1885-1889, 1991.
doi:10.1109/22.97492
Submit
