Design of Four-Way Substrate Integrated Coaxial Line (SICL) Power Divider for K Band Applications

In this paper, design of Substrate Integrated Coaxial Line (SICL) based four way power divider is presented. A detailed study of different configurations of power divider based on SICL technology is explored. To realize impedance matching at the three port junctions, SICL based quarter wave impedance transformer is used in both Tee and Y type power divider. Both the designs exhibit equal power division with output power within the range of -3 0.05dB. The phase difference between the output ports of the two way power divider is below 0.5°. A design of SICL 90° bend is also studied. To compensate the reactive loading effect at the bend, chamfering at the central conductor is implemented which helps to improve the S parameter performance of the design. Finally, the Tee and Y power divider is cascaded along with SICL bend to realize SICL four way equal power divider. The proposed design operates over entire K band (18-26 GHz) with its reflection coefficient below -16 dB. The output power of the design is within -6 0.55 dB and the phase difference between the output ports are below 0.9°. The proposed design is compact in size and exhibits broad bandwidth making it suitable for practical applications.