Affiliation:
1. School of Information and Communication the National University of Defense Technology Wuhan China
2. Sichuan Research Institute of Chemical Quality and Safety Testing Chengdu China
3. Second Research Institute of CAAC Chengdu China
Abstract
AbstractAimed at the interconnection between coaxial transmission line and substrate‐integrated waveguide (SIW), a wideband coaxial‐to‐SIW transition was proposed and applied in a 1‐to‐4 radial power divider. First of all, a fan‐shaped region was designed on the end of a SIW transmission line. Then, a coaxial transmission line was inserted into this region. To improve the impedance matching at the coaxial port, a feeding ring was designed on the back of the transition where the coaxial line was inserted. Next, the transition was applied in a 1‐to‐4 radial power divider to realize an equal power division. Finally, to validate the correctness of the designs, prototypes were fabricated and measured. For the coaxial‐to‐SIW transition, measured reflection coefficient |S11| was less than −15 dB from 7.84 to 12.18 GHz. Transmission coefficient |S21| was between −0.52 and −0.24 dB. For the 1‐to‐4 radial divider, measured |S11| was less than −15 dB from 7.91 to 12.4 GHz, and the transmission coefficient was around −6.9 dB. Measurement and simulation agreed well with each other. Therefore, the proposed design can be used in coaxial‐to‐SIW interconnection scenarios.