A Wideband High-Gain LTCC Cavity Antenna Fed by TE20 Mode Substrate Integrated Waveguide for W-band Applications

This paper presents a novel cavity antenna with high-gain radiation and wideband performance. It is designed with multilayer processing technology of low temperature cofired ceramic (LTCC). To avoid using excessive via holes and reduce the process complexity, the TE
20
mode is applied in the feeding substrate integrated waveguide (SIW) of cavity antenna. The cavity antenna itself is also operating in high-order mode by introducing two rectangular patches on the top aperture of the cavity. A high-gain cavity antenna is designed and simulated with wideband performance in W-band. The simulated results show a good impedance matching performance with 20% bandwidth. In the range of 81 GHz-99 GHz, the reflection coefficient is better than −15 dB. The maximum antenna gain is achieved of 11.4 dBi at 94 GHz. By using high-order mode on both antenna elements and feed networks, the fabrication of LTCC array antennas can be greatly simplified, which has potential for millimeter-wave and terahertz applications.