Analysis of Empty Substrate-Integrated Waveguide H Plane Horn Antenna for K Band Applications

This paper presents the analysis of Empty Substrate-Integrated Waveguide (ESIW) H plane horn antenna for K band application. The paper also compares the ESIW with Substrate-Integrated Waveguide (SIW) technology on various parameters for making the horn antenna. For K band applications, the SIW horn antenna provides various advantages over normal microstrip horn antenna. SIW technology is easy to fabricate and test and it provides all advantage of the conventional waveguide horn antenna. The SIW horn antenna is planer in design and can be easily interfaced with planer active and passive circuits. To improve the performance of SIW, the air-filled substrate cut is made to form ESIW, which is presented in this paper. The cut in substrate allows less dependency of an ESIW horn antenna over dielectric losses. The ESIW horn antenna does not require any extra element to improve the impedance matching at the end of the aperture; hence it shows an advantage over normal SIW horn antenna. The ESIW horn antenna can be used to make low profile short-range radar working in the K band.