volume | PIER Journals

Abstract

The uniform asymmetrical microstrip parallel coupled line is used to design the multi-section unequal Wilkinson power divider with high dividing ratio. The main objective of the paper is to increase the trace widths in order to facilitate the construction of the power divider with the conventional photolithography method. The separated microstrip lines in the conventional Wilkinson power divider are replaced with the uniform asymmetrical parallel coupled lines. An even-odd mode analysis is used to calculate characteristic impedances and then the per-unit-length capacitance and inductance parameter matrix are used to calculate the physical dimension of the power divider. To clarify the advantages of this method, two three-section Wilkinson power divider with an unequal power-division ratio of 1:2.5 are designed and fabricated and measured, one in the proposed configuration and the other in the conventional configuration. The simulation and the measurement results show that not only the specified design goals are achieved, but also all the microstrip traces can be easily implemented in the proposed power divider.

1. Wilkinson, E., "An N-way hybrid power divider," IRE Trans. Microw. Theory Tech., Vol. 8, No. 1, 116-118, Jan. 1960.

2. Cohn, S. B., "A class of broadband three port TEM-mode hybrids," IEEE Transactions on Microwave Theory and Techniques, Vol. 16, No. 2, 110-116, Feb. 1968.

3. Pozar, D. M., Microwave Engineering, 2nd Edition, Wiley, New York, 1998.

4. Collin, R. E., Foundations for Microwave Engineering, 2nd Edition, McGraw Hill, 1992.

5. Oraizi, H. and A.-R. Sharifi, "Design and optimization of broadband asymmetrical multisection Wilkinson power divider," IEEE Transactions on Microwave Theory and Techniques, Vol. 54, No. 5, 2220-2231, May 2006.

6. Lim, J.-S., S.-W. Lee, C.-S. Kim, J.-S. Park, D. Ahn, and S. Nam, "A 4:1 unequal Wilkinson power divider," IEEE Microw. Wireless Compon. Lett., Vol. 11, No. 3, 124-126, Mar. 2001.

7. Lim, J.-S., G.-Y. Lee, Y.-C. Jeong, D. Ahn, and K.-S. Choi, "A 1 : 6 unequal wilkinson power divider," 36th European Microwave Conference Proceedings, 200-203, Manchester, Sep. 2006.

8. Zhang, Z., Y.-C. Jiao, S. Tu, S.-M. Ning, and S.-F. Cao, "A miniaturized broadband 4 : 1 unequal Wilkinson power divider," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 4, 505-511, 2010.

9. Chen, J.-X. and Q. Xue, "Novel 5 : 1 unequal Wilkinson power divider using offset double-sided parallel-strip lines," IEEE Microw. Wireless Compon. Lett., Vol. 17, No. 3, 175-177, Mar. 2007.

10. Wu, Y., Y. Liu, S. Li, and C. Yu, "Extremely unequal Wilkinson power divider with dual transmission lines," Electronics Letters, Vol. 46, No. 1, 90-91, 2010.

11. Moradian, M. and H. Oraizi, "Application of grooved substrates for design of unequal Wilkinson power dividers," Electronics Letters, Vol. 44, No. 1, 32-33, Jun. 2008.

12. Cheng, K. K. M. and P. W. Li, "A novel power divider design with unequal power dividing ratio and simple layout," IEEE Transactions on Microwave Theory and Techniques, Vol. 57, No. 6, 1589-1594, Jun. 2009.

13. Yang, T., J. Chen, and Q. Xue, "Novel approach to the design of unequal power divider with high dividing ratio," Microwave and Optical Technology Letters, Vol. 51, No. 5, 1240-1243, May 2009.

14. Li, J.-L. and B.-Z. Wang, "Novel design of Wilkinson power dividers with arbitrary power division ratios," IEEE Transactions on Industrial Electronics, Vol. 58, No. 6, 2541-2546, Jun. 2011.

15. Zhu, Y. Z., W. H. Zhu, X.-J. Zhang, M. Jiang, and G.-Y. Fang, "Shunt-stub Wilkinson power divider for unequal distribution ratio," IET. Microwaves, Antennas & Propagation, Vol. 4, No. 3, 334-341, 2010.

16. Ekinge, R. B., "A new method of synthesizing matched broadband TEM-mode three-ports," IEEE Transactions on Microwave Theory and Techniques, Vol. 19, No. 1, 81-88, 1971.

17. Wu, Y. and Y. Liu, "A unequal coupled-line Wilkinson power-divider for arbitrary terminated impedances," Progress In Electromagnetic Research, Vol. 117, 181-194, 2011.

18. Moradian, M. and M. Tayarani, "Unequal Wilkinson power divider using asymmetric microstrip parallel coupled lines," Progress In Electromagnetics Research C, Vol. 36, 13-27, 2013.

19. Bazdar, B., A. R. Djordjevic, R. F. Harrington, and T. K. Sarkar, "Evaluation of quasi-static matrix parameters for multiconductor transmission lines using Galerkin's method," IEEE Transactions on Microwave Theory and Techniques, Vol. 42, 1223-1228, Jul. 1994.

20. Mongia, R., I. Bahl, and P. Bhartia, RF and Microwave Coupled-line Circuits, Artech House, Norwood, MA, 1999.

Ms. Puria Salimi

Dr. Mehdi Moradianpour

Dr. Ebrahim Borzabadi