A High-Permittivity Dielectric Material-Filled SISL Antenna With Cavity Backing

A high-permittivity dielectric material-filled substrate integrated suspended line (SISL) antenna with size reduction is proposed, which provides a novel fixing method for dielectric resonator antenna (DRA). The proposed antenna is based on five substrate layers with two air cavities while the high-permittivity dielectric material is filled with the upper air cavity of the hollowed substrate. So the antenna is self-packaging. The feeding line is on M5 layer and the bottom air cavity affects the resonant frequency much. The expression about the resonant frequencies, the height of the bottom air cavities, and the size of DRA is given. The operating frequency band is from 6.2 to 6.5 GHz and the maximum antenna gain is 6 dBi. In order to reduce the resonant frequency further, a cross strip is added to M2 layer. At last, the impedance bandwidth for |S
₁₁
| <; -10 dB is from 5.7 to 6 GHz and the maximum antenna gain is 5.2 dBi.