부산대학교 도서관

This paper presents a wideband substrate integrated waveguide (SIW) horn antenna with enhanced gain and front to back ratio (FTBR) for Ku-band applications. The proposed antenna is realized by placing an elliptical multi-layer multi-dielectric lens (EMLMDL) at the radiating aperture of a probe-fed thin (h 1 = λ 0 /13) SIW H-plane horn antenna. The top and bottom layers of the EMLMDL are realized by high-k dielectric material having relative permittivity 10.2, where as the middle layer is the extension of SIW horn aperture. This three layer arrangement reduces the aperture mismatch over a wide frequency band and improve gain and FTBR while maintaining the overall thickness of EMLMDL to 0.2λ 0 (λ 0 , being calculated at center frequency). The proposed antenna exhibits measured impedance bandwidth of 34% (12.9-18 GHz). The end-fire radiation pattern is fairly stable over the entire Ku-band with FTBR better than 12 dB. The peak gain variation over the operating band is 8.5-11.0 dBi.