Design, Simulation and Fabrication of Compact Microstrip Coupler with Performance Improvement and Harmonic Suppression
Subject Areas : electrical and computer engineeringT. Barati Kashantoui 1 , S. Roshani 2 *
1 -
2 -
Keywords: Branch line couplermicrostrip linesize reductionharmonic suppressionopen ended stub,
Abstract :
In this paper a novel branch line coupler (BLC) with size reduction and performance improvement at 2.4 GHz is proposed. The proposed branch line coupler suppresses the second harmonic with 38.55 dB attenuation level. The scattering parameters of the proposed BLC are given as follows: S11= -67.67 dB, S12= -2.95 dB, S13= -3.09 dB and S14= -49.78 dB. The bended line structures and open-ended stubs are used in design process. The proposed BLC has 45.4% size reduction compare to the conventional one. The proposed device fabricated on RT/Duroid 5880 substrate.
[1] J. Wang, J. Ni, S. Zhao, and Y. X. Guo, "Compact microstrip ring branch-line coupler with harmonic suppression," J. of Electromagnetic Waves and Applications, vol. 23, no. 16, pp. 2119-2126, Apr. 2009.
[2] D. M. Pozar, Microwave Engineering, John Wiley & Sons, 2009.
[3] S. Gomha, E. S. M. El-Rabaie, and A. A. T. Shalaby, "Optimizing the performance of branch-line couplers using open ended stubs," in Int. Conf. on Computing, Electrical and Electronics Engineering, ICCEEE'13, , pp. 363-367, Aug. 2013.
[4] S. J. Wu, J. D. Tseng, Y. H. Shih, and K. H. Lin, "Mixed type branch line coupler designs," in Proc. Asia-Pacific Symp on Electromagnetic Compatibility, APEMC'15, pp. 728-731, May 2015.
[5] Y. Wang, K. Ma, and S. Mou, "A compact branch-line coupler using substrate integrated suspended line technology," IEEE Microwave and Wireless Components Letters, vol. 26, no. 2, pp. 95-97, Jan. 2016.
[6] P. Bhowmik, T. Moyra, and P. K. Deb, "Size miniaturization of 3 dB branch line coupler by using open stubs," in Proc. 2nd Int. Conf. on Signal Processing and Integrated Networks, SPIN'15, pp. 642-645, Feb. 2015.
[7] A. C. Das, L. Murmu, and S. Dwari, "A compact branch-line coupler using folded microstrip lines," in Proc. Int. Conf. on Microwave and Photonics, ICMAP'13, 3 pp., 1-3 Dec. 2013.
[8] A. Sardi, J. Zbitou, A. Errkik, L. El Abdellaoui, A. Tajmouati, and M. Latrach, "A novel design of branch-line coupler 3 dB microstrip using open stubs," in Proc. Workshop Int. sur les nouvelles Technologies sans fil et Systèmes répartis, WITS'14, 4 pp., 9-10 Apr. 2014.
[9] Y. C. Chiang and C. Y. Chen, "Design of a wide-band lumped-element 3 dB quadrature coupler," IEEE Trans. on Microwave Theory and Techniques, vol. 49, no. 3, pp. 476-479, Mar. 2001.
[10] S. S. Liao, P. T. Sun, N. C. Chin, and J. T. Peng, "A novel compact-size branch-line coupler," IEEE Microwave and Wireless Components Letters, vol. 15, no. 9, pp. 588-590, Sept. 2005.
[11] R. W. Voge, "Analysis and design of lumped and lumped distributed element directional couplers for MIC and MMIC application," IEEE Trans. Microw. Theory and Tech, vol. 40, no. 2, pp. 253-262, Feb. 2003.
[12] K. W. Eccleston and S. H. Ong, "Compact planar microstrip line branch-line and rat-race couplers," IEEE Trans. on Microwave Theory and Techniques, vol. 51, no. 10, pp. 2119-2125, Oct. 2003.
[13] K. O. Sun, S. J. Ho, C. C. Yen, and D. van der Weide, "A compact branch-line coupler using discontinuous microstrip lines," IEEE Microwave and Wireless Components Letters, vol. 15, no. 8, pp. 519-520, Aug. 2005.
[14] J. Gu and X. Sun, "Miniaturization and harmonic suppression of branch-line and rat-race hybrid coupler using compensated spiral compact microstrip resonant cell," in Proc. Int. IEEE Microwave Symp., MTT-S'05, pp. 1211-1214, Jun. 2005.
[15] 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. on Microwave Theory and Techniques, vol. 54, no. 9, pp. 3508-3514, Aug. 2006.
[16] S. Gomha, M. EL-Sayed, A. A. T. Shalaby, and S. Ahmed, "Miniaturization of branch-line couplers using open stubs and stepped impedance unit cells with meandering transmission lines," Circuits and Systems: An International J., vol. 1, no. 3, pp. 13-26, Jul. 2014.
[17] Y. L. Then, K. Y. You, M. N. Dimon, J. C. Chong, and T. S. Tan, "Compact microstrip S-band 90° hybrid coupler," in Proc. IEEE Symp. on Wireless Technology and Applications, ISWTA'13, pp. 202-206, Sept. 2013.
[18] G. Tian, J. P. Yang, L. Cui, W. Wu, and S. C. Shi, "Research on the equivalent circuit of microstrip T-junctions and its application on branch-line coupler," in Proc. Int. Conf. on Microwave and Millimeter Wave Technology, ICMMT, 4 pp., Shenzhen, China, 5-8 May 2012.