Investigation of SIW directional coupler for 60ghz mm-wave applications


  • K. Bharath Kumar
  • T. Shanmuganantham





Directional Coupler, GCPW, mm-wave, SIW, SIP, SOS, Surface Current, RADAR, Wireless Communication.


In this article, 60 GHz directional coupler is designed by using Substrate Integrated Waveguide (SIW) technology using Coplanar waveguide as a transmission path. To design directional coupler RT duriod 5880 substrate material is used. Here directional coupler is analyzed by changing the thickness of copper coating and height of the substrate. By changing the thickness of copper coating and height of substrate examining the directional coupler results like reflection coefficient, insertion loss, coupling factor, isolation loss, VSWR, surface current, Electric field and magnetic field variations. Verifying the thickness and height of substrate is suitable for RADAR application in millimeter frequency range. RT duriod 5880 substrate material height is 0.508mm and thickness of 0.035mm are chosen to design directional coupler. At 60 GHz directional coupler gives reflection coefficient as -36.03 dB, insertion loss as -1.3 dB, coupling factor of -6.3 dB and isolation loss of -36 dB.


[1] Rahali Bouchra, Feham Mohammed, “Design of K-Band Substrate Integrated Waveguide Coupler, Circulator and Power Divider.†IJIEE International Journal of Information and Electronics Engineering, Vol. 4, No. 1, January 2014.

[2] Rahali Bouchra, Feham Mohammed,â€Substrate Integrated Waveguide Power Divider, Circulator and Coupler in [10-15] GHz Bandâ€, IJIST International Journal of Information Sciences and Techniques, Vol. 4, No. 1/2, March 2014, ISSN (Online):2249-1139.

[3] B. H. Ahmad, Siti Sabariah Sabri, “A. R. Othman: Design of a compact X-Band substrate integrated waveguide directional couplerâ€, International Journal of Engineering & Technology, vol. 5, no. 2, pp. 190 -1911, 2013.

[4] Rahali Bouchra, Feham Mohammed, “Coupler, Power Divider and Circulator in V-Band Substrate Integrated Waveguide Technologyâ€, IJCSA International Journal on Computational Sciences & Applications Vol.3, No.6, and December, 2013.

[5] K.Bharath Kumar, Dr.T.Shanmuganantham, “A Survey of Recent Technologies and Research Challenges of Substrate Integrated waveguideâ€, IEEE 6th International Advanced Computing Conference, Bhimavaram, 2015.

[6] K.Bharath Kumar, Dr. T.Shanmuganantham, “Four dielectric substrate analyses for millimeter-wave applicationâ€, Second International Conference on Large Area and Flexible Microelectronics, Bangalore, 2016.

[7] K.Bharath Kumar, Dr.T.Shanmuganantham. “SIW Hybrid coupler for mm-wave applicationsâ€, IEEE International Conference on Control, Instrumentation, Communication and Computational Technologies, Kanyakumari, 2016.

[8] K.BharathKumar, Dr.T.Shanmuganantham, “A Novel Substrate Integrated Waveguide Crossed Hybrid Coupler for mm-wave Applicationsâ€, International Conference on advanced computing & Communication Systems, Coimbatore, 2017.

View Full Article: