volume | PIER Journals

Abstract

A topology for a 3-dB broadband and small-size ring coupler is proposed. It consists of fullydistributed Composite Right-/Left-Handed phase shifters and a Lange coupler. For the fabricated coupler, the frequency bandwidth is one octave, centered on 1.5 GHz, while the footprint area is 25% compared to the conventional ring coupler topology. The experimental results are in good agreement with the expected ones, obtained by electromagnetic simulation.

1. Pon, C. Y., "Hybrid-ring directional coupler for arbitrary power divisions," IRE Trans. Microwave Theory and Techniques, Vol. 9, No. 6, 529-535, Nov. 1961.
doi:10.1109/TMTT.1961.1125385

2. Huo, J.-T. and C.-H. Tsai, "Generalized synthesis of rat race ring coupler and its application to circuit miniaturization," Progress In Electromagnetics Research, Vol. 108, 51-64, 2010.

3. Kim, D. I. and G. S. Yang, "Design of new hybrid-ring directional coupler using l8 or l6 sections," IEEE Trans. on Microwave Theory and Techniques, Vol. 39, No. 10, 1179-1784, Oct. 1991.

4. Coupez, J. P., A. Peden, and C. Person, "Analysis and design of ultra miniature hybrid ring directional coupler," Proc. 22nd European Microwave Conf., Vol. 1, 443-447, 1992.

5. Chuang, M. L., "Miniaturized ring coupler of arbitrary reduced size," IEEE Microwave and Wireless Components Letters, Vol. 15, No. 2, 16-18, Jan. 2005.
doi:10.1109/LMWC.2004.840960

6. Simion, S., "Small-size ring coupler design method based on fully distributed composite right/left handed approach," Electronics Letters, Vol. 48, No. 23, 1481-1483, Nov. 2012.
doi:10.1049/el.2012.2620

7. Kim, D. I. and Y. Naito, "Broad-band design of improved hybrid-ring 3-dB directional couplers," IEEE Trans. on Microwave Theory and Techniques, Vol. 30, No. 11, 2040-2046, Nov. 1982.
doi:10.1109/TMTT.1982.1131373

8. Ho, C. H., L. Fan, and K. Chang, "Broadband uniplanar hybrid ring coupler," Electronics Letters, Vol. 29, No. 1, 44-45, Jan. 1993.
doi:10.1049/el:19930029

9. Murgulescu, M. H., M. Moisan, P. Legaud, E. Penard, and I. Zaquine, "New wideband, 0:67l gcircumference 180 hybrid ring coupler ," Electronics Letters, Vol. 30, No. 4, 299-300, Feb. 1994.
doi:10.1049/el:19940234

10. Wang, T. and K. Wu, "Size-reduction and band-broadening design technique of uniplanar hybrid ring coupler using phase inverter for M(H)MIC's," IEEE Trans. on Microwave Theory and Techniques, Vol. 47, No. 2, 198-206, Feb. 1999.
doi:10.1109/22.744295

11. March, S., "A wideband stripline hybrid ring," IEEE Trans. on Microwave Theory and Techniques, Vol. 61, No. 6, 361, Jun. 1968.
doi:10.1109/TMTT.1968.1126693

12. Ahn, H. R. and B. Kim, "Small wideband coupled-line ring hybrids with no restriction on coupling power," IEEE Trans. on Microwave Theory and Techniques, Vol. 57, No. 7, 1806-1817, Jul. 2009.
doi:10.1109/TMTT.2009.2022815

13. Simion, S., "Design method of miniaturized ring coupler using phase shifters consisting of fully-distributed composite right/left-handed structures," Progress In Electromagnetics Research B, Vol. 50, 61-76, 2013.

14. Chi, P. L., "Miniaturized ring coupler with arbitrary power divisions based on the composite right/left-handed transmission lines," IEEE Microwave and Wireless Components Letters, Vol. 22, No. 4, 170-172, Apr. 2012.
doi:10.1109/LMWC.2012.2189376

15. Okabe, H., C. Caloz, and T. Itoh, "A compact enhanced-bandwidth hybrid ring using an artificial lumped-element left-handed transmission-line section," IEEE Trans. on Microwave Theory and Techniques, Vol. 52, No. 3, 798-804, Mar. 2004.
doi:10.1109/TMTT.2004.823541

Prof. Stefan Simion

Dr. Giancarlo Bartolucci