TDXL-BLS3009 is a combined antenna designed for BDS positioning B3I, B2b global short message, and BDS short message S-band satellite signals reception, as well as BDS short message L-band signals transmission. It is designed with a laminated integrated design to achieve miniaturization, while maintains high gain, a wide beam pattern and excellent high and low elevation performance. The special material used for the antenna ensures excellent resistance to extreme temperature fluctuation and corrosion, which can do outdoor work for a long time. To meet the challenges of high-pressure environments, the antenna base and mid-frame are constructed from a special metal material (titanium alloy). The face shell of the antenna is made from a special polycarbonate (PC) material that not only guarantees the antenna performance but also maximizes its pressure resistance capabilities. Meanwhile, its internal potting process excludes air from within the antenna, achieving a balanced pressure differential effect.