Design and simulation of a P-band substrate integrated waveguide horn antenna

This paper researched a kind of Substrate Integrated waveguide (SIWL) horn antenna, which works at P band. The discussed P-band SIW horn antenna has low profile and end-fire radiation pattern, so it is an alternative scheme when the dimension of antenna mounting platform is limited or the end fire radiation beam is required for the practical engineering application. This paper designed and simulated a SIW horn antenna fed with coaxial cable and the working frequency was 500MHz. The effects of substrate thickness on the performances of the SIW horn antenna was considered and simulated in order to diminish the height of SIW horn. The metal diaphragms were loaded at the side walls of the SIW horn, which were used to realize the impedance matching. The designed SIW horn antenna was simulated and optimized by use of full wave electromagnetic simulation software. The simulated voltage standing wave ratio (VSWR) of designed SIW horn antenna was less than 2 at the central frequency and directivity of the simulated SIW horn antenna is higher than 3dBi, and the end fire radiation pattern is also achieved. The height of the designed SIW horn antenna was 25 mm and low profile characteristic was also attained. Yet the band width of designed SIW horn antenna is narrow, so it is suitable for the case with narrow frequency range. The research results in this paper can provide certain technical references for some practical engineering applications.