Dual-Band Structurally Embedded High-Temperature Resistant Antenna with High Isolation and Wide Beam

In this paper, a dual-band structurally embedded high-temperature resistant antenna operating at X-band and Ka-band is designed with high isolation and wide beam. The dual-band antenna is composed of a ceramic dielectric double-sided printed dipole antenna (DSPDA) connected with substrate integrated waveguide (SIW) and a ceramic dielectric rod antenna (DRA) fed by the dielectric-filled waveguide, whose broadside is replaced by the SIW. High isolation performance can be realized due to polarization orthogonality between DSPDA and DRA. The dual-band antenna is embedded in the center position of the thermal insulation material, which is packaged by the thermal protection shield. Because of the lower thermal conductivity of the ceramic dielectric of DRA and the longer gap between DSPDA and the top of the thermal protection shield, the high-temperature resistant antenna can achieve good thermal insulation performance. Under the continuous time of the 1900s and surface heat source temperature of 1200°C, the feed ports can be kept within 165°C