Development of a microstrip branch-line coupler with a high degree of miniaturization. Abstract

Development of a microstrip branch-line coupler with a high degree of miniaturization

Federal State Autonomous Educational Institution of Higher Professional Education «Ural Federal University named after the first President of Russia B.N.Yeltsin», Mira 32, Yekaterinburg 620002, Russia

The paper is received on February 25, 2018, after correction - on March 23, 2018

Abstract. In this paper the design of a compact branch-line coupler has been developed. The procedure of miniaturization consists in the use of equivalent circuits whose longitudinal dimensions are more than 2 times less as compared with the usual quarter-wave segments. For a more significant reduction in the area of the coupler, the elements of equivalent circuits are located in the inner area of the coupler. Using the method of etching printed circuit boards, a prototype of the proposed coupler was manufactured. The resulting design has an area of 75.1% less than the traditional design area, with a reduction in the relative frequency band by only 1%.

1. Vol’man V.I., Pimenov Yu.V. Tekhnicheskaya elektrodinamika [Technical electrodynamics]. Moscow, Svyaz’ Publ., 1971, 487 p. (In Russian)

2. Kai-Yu Tsai, Hao-Shun Yang, Jau-Horng Chen, and Yi-Jan Emery Chen. A miniaturized 2 dB Branch-Line Hybrid Coupler With Harmonics Suppression. IEEE Microw. Wireless Compon. Lett., vol. 21, no. 10, pp. 537-539, Oct. 2011.

3. C. W. Tang and M.-G.Chen. Synthesizing microstrip branch-line coupler with predetermined compact size and bandwidth. IEEE Trans. Microw. Theory Tech., vol. 55, pp. 1926-1934, Sep. 2007.

4. Chao-Wei Wang, Tzyh-Ghuang Ma and Chang-Fa Yang. A new planar artificial transmission line and its applications to a miniaturized butler matrix. IEEE Trans. Microw. Theory Tech., vol. 55, no. 12, pp. 2792-2801, Dec. 2007.

5. Kimberley W. Eccleston and Sebastian H. M. Compact planar microstripline branch-line and rat-race couplers. IEEE Trans. Microw. Theory Tech., vol. 51, no. 10, pp. 2119-2125, Oct. 2003.

6. S.-S. Liao and J.-T. Peng. Compact planar microstrip branch-line couplers using the quasi-lumped elements approach with nonsymmetrical and symmetrical T-shaped structure. IEEE Trans. Microw. Theory Tech., vol. 54, pp. 3508-3514, Sep. 2006.

7. N.N.Schetinin, V.A.Mel’nik. Compact microstrip 3 dB quadrature directional coupler. Vestnik Voronezhskogo Instituta FSIN Rossii – Proceedings of Voronezh Institute of Federal Penitentiary Service of Russia. 2014, No. 4, pp. 26-28 (In Russian)

8. N.N.Schetinin, A.V.Ostankov, E.I.vorobyeva. Mathematical model for designing microstrip directional coupler on quasi-concentrared elements. Vestnik VoronezhskogoState Technical University – Proceedings of Voronezh State University, 2014, vol.10, no. 3-1, pp. 66-70 (In Russian)

9. Chao-Hsiung Tseng and Chih-Lin Chang. A rigorous design methodology for compact planar branch-line and rat-race couplers with asymmetrical T-structure. IEEE Trans. Microw. Theory Tech., vol. 60, no. 7, pp. 2085-2092, July 2012.

10. K. W. Eccleston and S. H. M. Ong. "Compact planar microstripline branch-line and rat-race coupler. IEEE Trans. Microw. Theory Tech., vol. 51, pp. 2119-2125, Oct. 2003.

11. Wei-Shin Chang and Chi-Yang Chang. A high slow-wave factor microstrip structure with simple design formulas and its application to microwave circuit design. IEEE Trans. Microw. Theory Tech., vol. 60, no. 11, pp. 3376-3383, Nov. 2012.

12. Hani Ghali and Tarek A. Moselhy. “Miniatuized fractal rat-race, branch-line, and coupled-line hybrids. IEEE Trans. Microw. Theory Tech., vol. 52, no. 11, pp. 2513-2520, Nov. 2004.

For citation:

D. A. Letavin. Development of a microstrip branch-line coupler with a high degree of miniaturization. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2018. No. 3. Available at http://jre.cplire.ru/jre/mar18/9/text.pdf.

DOI 10.30898/1684-1719.2018.3.9