paper 150127193738

Abstract

This paper presents a high dividing ratio unequal power divider with improved isolation using a series RC circuit. To improve isolation, we used an isolation component com- posed of a series resistor and capacitor circuit. This circuit is placed at an arbitrary position in the quarter-wave transmission line to achieve power division. In addition, to achieve a high dividing ratio, the low impedance line is composed of a capacitive loaded transmission line with slow-wave characteristics. To validate the performance of the proposed unequal power divider, we simulated and fabricated the unequal power divider for an operating frequency of 1 GHz. The experimental results are in good agreement with the simulated results.

1. Kim, J. G., H. S. Lee, J. B. Yoon, and S. C. Hong, "60 GHz CPW-fed post-supported patch antenna using micromachining technology," IEEE Microw. Wireless Compon. Letters, Vol. 15, No. 1, 635-637, 2005.
doi:10.1109/lmwc.2005.856690 Google Scholar

2. Kim, J. H., J. H. Cha, I. D. Kim, and B. M. Kim, "Optimum operation of asymmetrical-cells based linear Doherty power amplifiers uneven power drive and power matching," IEEE Trans. Microw. Theory Tech., Vol. 53, No. 5, 1802-1809, May 2005.
doi:10.1109/tmtt.2005.847073 Google Scholar

3. Ghannouchi, F. M. and A. Mohammadi, The Six-port Technique with Microwave and Wireless Applications, Artech House, Norwood, 2009. Google Scholar

4. Wang, X., I. Sakagami, K. Takahashi, and S. Okamura, "A generalized dual-band Wilkinson power divider with parallel L, C, and R components," IEEE Trans. Microw. Theory Tech., Vol. 60, No. 4, 952-964, 2012.
doi:10.1109/tmtt.2012.2184298 Google Scholar

5. Kim, S.-H., J.-H. Yoon, Y. Kim, and Y.-C. Yoon, "A modified Wilkinson divider using zero-degree phase shifting composite right/left-handed transmission line," IEEE MTT-S Int. Microw. Symp. Dig., 1556-1559, May 2010. Google Scholar

6. Liu, L., R. Jin, H. Yu, X. Liang, J. Geng, and X. Bai, "A compact ultra-wideband power divider with high isolation," IEEE Antennas Progag. Int. Symp., 641-642, 2014.
doi:10.1109/aps.2014.6904651 Google Scholar

7. Kao, J.-C., Z.-M. Tsai, K.-Y. Lin, and H. Wang, "A modified Wilkinson power divider with isolation bandwidth improvement," IEEE Trans. Microw. Theory Tech., Vol. 60, No. 9, 2768-2780, 2012.
doi:10.1109/tmtt.2012.2206402 Google Scholar

8. Chiang, C.-T., "Ultra wideband power divider using tapered line," Progress In Electromagnetics Research, Vol. 106, 61-73, 2010.
doi:10.2528/pier10061603 Google Scholar

9. Song, K. and Q. Xue, "Novel ultra-wideband (UWB) multilayer slotline power divider with bandpass response," IEEE Microw. Wireless Compon. Letters, Vol. 20, No. 1, 13-15, 2010.
doi:10.1109/lmwc.2009.2035951 Google Scholar

10. Kim, Y. and Y.-C. Yoon, "A modified unequal power divider with a complex isolation component for enhanced isolation," Microw. Optical Tech. Letters, Vol. 57, No. 2, 322-324, 2015.
doi:10.1002/mop.28843 Google Scholar

11. Eccleston, K. W. and S. H. Ong, "Compact planar microstrip line branch-line and rat-race couplers," IEEE Trans. Microw. Theory Tech., Vol. 51, No. 10, 2119-2125, 2003. Google Scholar

Young Kim

Seokhyun Sim

Youngchul Yoon