The CGGP.25.4.E.02 is a 25*25*4 mm embedded ceramic GPS/Glonass Patch antenna. It features a double resonance design at GPS and GLONASS bands, 1575.42 MHz and 1602 MHz respectively. This antenna has been tuned for a centre position on a 70mm *70mm ground plane. Return loss is -28 dB at 1575.42MHz and -22 dB at Glonass. Overall the antenna has greater than 60% efficiency. For further optimization to customer specific device environments where positioning is off centre or a different ground-plane size, custom tuned patch antennas can be supplied.