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GPS Quadrifilar Antenna

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Maxtena offers its RadioMax M1575CQA GPS quadrifilar antenna. Its compact size and ground–plane independence is designed to simplify integration into handsets. The M1575CQA directly connects to an RF transceiver chip without baluns or matching networks. RadioMax technology reduces currents that are driven onto the ground plane, making the antenna more resistant to the effects of human exposure (for better performance in handsets). According to the company, RadioMax provides efficiency of 38 percent (total spherical) and gain of -1.3 dBic. The beamwidth (3dB) is 140 degrees (both axes) and bandwidth is 10 MHz (1570.42–1580.42 MHz). Cross Pole rejection is 15 dB; axial ratio, 0.2 dB; front to back ratio, 15 dB; VSWR 1.3: 1; and impedance (differential) 100 Ohms. Overall dimensions are 10 millimeters (diameter) by 20 millimeters (length). The Maxtena FilterMax technology is available if more out-of-band rejection of undesired signals is needed. Maxtena, Inc., Blacksburg, Virginia, USA.

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