With a more concise, neat, and flat breakthrough antenna design, the Castle Patch Antenna uses ceramic materials as the base material combined with the cavity structure to design a single-layer structure for receiving multi-frequency GNSS signals, which can perform dual-frequency and triple-frequency, even multi-frequency operation, especially suitable for applications equipped with RTK high-precision positioning technology. What makes castle special is that it uses the partial cavity structure to create two different frequencies, which is the complete dielectric. However, the technology of stacked can not do it. More importantly, the thicker the resonance cavity, the better the antenna gain will be. As seen here, the castle is a competitive product.