APARM1504-SG3 is a compact GPS/GLONASS/Galileo/Beidou ceramic patch antenna designed for multi-constellation GNSS reception. It features a compact size of 15.0 x 15.0 x 4.0 mm with a lightweight construction of 5.27 g, and supports frequency bands including GPS L1/L2/L5, GLONASS G1/G2/G3, Galileo E1/E5a/E5b/E6, and BeiDou B1/B2/B3. The antenna provides a peak gain of up to 1.9 dBic at 1602 MHz (G1), VSWR less than 2.0, and maximum efficiency of 70% with right-hand circular polarization (RHCP). Operating over a wide temperature range of -40°C to +105°C, this RoHS-compliant antenna utilizes through-hole mounting and is ideal for GNSS modules, UAVs and drones, asset tracking, intelligent transportation, and precision agriculture applications.