A novel compact 4-way power divider is presented here, which consists of 1/64th mode elliptically curved substrate integrated waveguide (SIW) resonators and radial transmission lines. A direct coaxial fed circular patch acting as the radial transmission line is connected with four elliptically curved 1/64th mode SIW resonators, and these resonators are then connected to output terminals. An equivalent circuit model is developed to understand its behavior. It is designed to operate at 3.6 GHz covering the frequencies assigned for 5G in sub-6 GHz band. Conventional PCB techniques are used to fabricate the prototype. The measured bandwidth is 2.2 GHz, ranging from 2.5 GHz to 4.7 GHz, for which the return loss is less than -10 dB. Also, the transmission coefficient between input and each output for the above-mentioned frequency band is -6.4±0.5 dB. It has a very compact footprint of 0.32λg2, which is at least 40% smaller than various SIW based state of the art power dividers.
2. Luo, M., et al., "A compact balanced-to-balanced filtering gysel power divider using λg/2 resonators and short-stub loaded resonator," Microw. Wirel. Compon. Lett., Vol. 27, No. 7, 645-647, 2017.
3. Shi, J., et al., "A compact differential filtering quasi-Yagi antenna with high frequency selectivity and low polarization levels," Antennas Wirel. Propag. Lett., Vol. 14, No. 16, 1573-1576, 2015.
4. Feng, W. J., et al., "Single-ended-to-balanced filtering power dividers with wideband common-mode suppressio," Trans. Microw. Theory Tech., Vol. 66, No. 12, 5531-5542, 2018.
5. Li, S., X. Wang, J. Wang, and L. Ge, "Design of compact single-ended-to-balanced filtering power divider with wideband common-mode suppression," Electronics Letters, Vol. 55, No. 17, 947-949, 2019.
6. Cheng, Y., Substrate Integrated Antennas and Arrays, CRC Press, Boca Raton, 2015.
7. Wang, Y., et al., "Half Mode Substrate Integrated Waveguide (HMSIW) bandpass filter," IEEE Microw. Wireless Compon. Lett., Vol. 17, No. 4, 265-267, Apr. 2007.
8. Zou, X., C. M. Tong, and D. W. Yu, "Y-junction power divider based on substrate integrated waveguide," IET Electron. Lett.,, Vol. 47, No. 25, 1375-1376, Dec. 2011.
9. Ali, M., K. K. Sharma, and R. P. Yadav, "Design of compact dual band quarter mode SIW cavity backed slot antenna," 2017 International Conference on Inventive Computing and Informatics (ICICI), 888-890, Coimbatore, 2017.
10. Zhang, R., J. Zhou, Z. Yu, and B. Yang, "A low phase noise feedback oscillator based on SIW bandpass response power divider," IEEE Microw.Wireless Compon. Lett., Vol. 28, No. 2, 153-155, Feb. 2018.
11. Wang, X., X. Zhu, L. Tian, P. Liu, W. Hong, and A. Zhu, "Design and experiment of filtering power divider based on shielded HMSIW/QMSIW technology for 5G wireless applications," IEEE Access, Vol. 7, 72411-72419, 2019.
12. Moznebi, A., K. Afrooz, M. Danaeian, and P. Mousavi, "Four-way filtering power divider using SIW and eighth-mode SIW cavities with ultrawide out-of-band rejection," IEEE Microwave and Wireless Components Letters, Vol. 29, No. 9, 586-588, Sept. 2019.
13. Song, K., Y. Fan, and Y. Zhang, "Eight-way substrate integrated waveguide power divider with low insertion loss," IEEE Trans. Microw. Theory Techn., Vol. 56, No. 6, 1473-1477, Jun. 2008.
14. Song, K. and Q. Xue, "Planar probe coaxial-waveguide power combiner/divider," IEEE Transactions on Microwave Theory and Techniques, Vol. 57, No. 11, 2761-2767, Nov. 2009.
15. Khan, A. A. and M. K. Mandal, "Miniaturized Substrate Integrated Waveguide (SIW) power dividers," IEEE Microwave and Wireless Components Letters, Vol. 26, No. 11, 888-890, Nov. 2016.
16. Marcuvitz, N., Waveguide Handbook, McGraw-Hill, New York, 1951.
17. Edwards, T. C. and M. B. Steer, Foundations of Interconnect and Microstrip Design, 3rd edition, Wiley Press, 2001.
18. Pozar, D. M., Microwave Engineering, 3rd edition, Wiley, New York, NY, USA, 2005.
19. Song, K., S. Guo, and Y. Fan, "Four-way chained quasi-planar slotted-HMSIW power divider," IEEE Microwave and Wireless Components Letters, Vol. 28, No. 2, 117-119, Feb. 2018.
20. Song, K., F. Xia, Y. Zhou, S. Guo, and Y. Fan, "Microstrip/Slotline-coupling substrate integrated waveguide power divider with high output isolation," IEEE Microwave and Wireless Components Letters, Vol. 29, No. 2, 95-97, Feb. 2019.
21. Yang, M., J. Wang, X. Wang, and W. Wu, "Design of wideband four-way filtering power divider based on SIW loaded square patch resonator," Electronics Letters, Vol. 55, No. 7, 389-391, 2019.
22. Jin, H., G. Q. Luo, W. Wang, W. Che, and K. Chin, "Integration design of millimeter-wave filtering patch antenna array with SIW four-way anti-phase filtering power divider," IEEE Access, Vol. 7, 49804-49812, 2019.