DAKC1575MS74T GPS DIELECTRIC PATCH ANTENNA Description The TOKO #DAKC1575MS74T is a low profile, dielectric antenna element specifically designed for 1575.42 MHz L1 GPS applications. The flat patch antenna incorporates a rectanglar micro-strip design for GPS C/A right-hand circular polarization wave reception. The #DAKC1575MS74T has excellent stability and sensitivity through the use of high performance ceramic materials well suited for GPS applications and ships with double-sided adhesive tape for ease in mounting to the ground plane. Dimensions 25 0.5Max. 3-R0.5 4 1.7 ø0.8 3.3 Range of Receiving Freq: 1575.42±1.023 MHz Center Frequency: 1580.5 MHz with 70mm2 GND plane1 Bandwidth: 9 MHz min. (Return Loss ≤ -10 dB) Miniature footprint: 25mm x 25mm Low Profile: 4.5mm Gain (Zenith 90°): +5 dBi (typ.) Gain (10° Elevation): -1 dBi (typ.) Impedance: 50 Ω Freq. Temperature Coefficient: 0±20ppm/°C max. Operation Temperature: - 40°C to +105°C Storage Temperature: - 40°C to +105°C Lead-free terminated electrode (Part No. #DAKC1575MS74T) 1.9 • • • • • • • • • • • • 25 Features (Unit: mm) C2 Typical Characteristics Directivity Charts Return Loss ������� ������� ���� ������� ��������������� ��������� ������������ ��������������� ��� 30 ��������� ������������������ 60 00 3 6 10 30 330 60 300 � 25 270 � 240 150 � 180 210 240 120 150 180 210 TX: Right Hand Circular Polalized Signal Frequency = 1580.5MHz � ��������� 25 270 90 120 ������ 300 20 20 90 330 15 15 ������������������������ 00 3 6 10 ���������������� Measured with 70mm sq. ground plane NOTE 1: Center frequency is shifted approximately 5MHz down when covered with radome. The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc. TOKO America, Inc. 1250 Feehanville Drive, Mount Prospect, Illinois 60056 Tel: (847) 297-0070 Fax: (847) 699-7864 Web: http://www.tokoam.com April 2005 © 2005 TOKO America, Inc. All Rights Reserved Printed in USA CF-293-DAKC1575 R-LOG0405A 1