TOKO antenna - GPS Information
TOKO antenna - GPS Information
TOKO antenna - GPS Information
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DAK SeriesDIELECTRIC PATCH ANTENNADESCRIPTIONToko's DAK Series is a miniature dielectric <strong>antenna</strong>element for Global Positioning Systems (<strong>GPS</strong>). Thispatch <strong>antenna</strong> has excellent stability and sensitivitythrough the use of high performance proprietaryceramic material well suited for <strong>GPS</strong> frequencies.FEATURES■■■ELEMENT CONSTRUCTION■ Flat patch <strong>antenna</strong>■■■■One quarter the size of traditional <strong>antenna</strong>elements without loss of sensitivityExcellent temperature stability via use of lowtemperature coefficient dielectric ceramicsSilver plated electrode allows very goodhigh frequency characteristicsRectangular micro-strip <strong>antenna</strong> designUse for <strong>GPS</strong> C/A right hand circular polarizationwave receptionOffset one point feeding through ground planemethod25mm square sizeDIMENSIONSDAK SERIESSPECIFICATIONSPart NumberOutlineDimensionGround PlaneDAK1575MS50 25 mm 70 x 70mmCenter FrequencyBandwidthImpedanceGain @ ZenithGain @ 10° ElevationTemperature Coefficient1580.5 MHz*9 MHz min.50Ω+5 dBi typical-1 dBi typical20 ppm/°C max.(-40 to +105°C)*Center frequency is shifted 5MHz down when coveredwith a radome.4.0 ±0.225.0 ±0.2C20.80Φ1.9 ±0.11.7 ±0.125.0 ±0.23-R0.53.3 ±0.3Material: ε r =20.3±1.0Electrode: SilverTerminal Pin: Solder coated, copper plated brass0.5 maxUnit: mm
DAK SeriesTEST FIXTURE &ANTENNA SETUP & MEASUREMENTTEST FIXTURECH1 S11 log MAG 5 dB/ REF 0 dB 1: -20.555 dBSOCKET PINGROUND PLANE(70 x 70mm)SMA RF CONNECTOR(CALIBRATION POINT)Cor1.5805 GHzBW: .0254 GHzcent: 1.5804 GHzQ: 62.1271. loss: -29.664 dBANTENNA SETUP AND MEASUREMENT3 41ANTENNA ELEMENTCENTER 1.5750 GHz SPAN .2000 GHz2VECTOR NETWORK ANALYZERS11 log MAGS11 SMITHS11 SWRDIRECTIVITY CHARTPART NUMBER DAK1575MS500° 90°6030 0 0361 01 53303006030 0 0361 01 5330300202090252709025270120240120240150180210150180210
DAK SeriesANTENNA GAIN VS GROUND PLANE SIZEPART NUMBER DAK1575MS50GAIN (dBi)65432140 50 60 70 80 90 100SIZE OF SQUARE GROUND PLANE (mm)F=1580.5MHzFREQUENCY SHIFT OF DIELECTRIC ANTENNA BY GROUND PLANE SIZEPART NUMBER DAK1575MS50CENTER FREQ. (MHz)15841583158215811580157915781577157640 50 60 70 80 90 100SIZE OF SQUARE GROUND PLANE (mm)
DAK SeriesAXIAL RATIOPART NUMBER DAK1575MS50AXIAL RATIO (dB)1210864201565 1570 1575 1580 1585 1590 1595with 70mm sq. GND plane FREQUENCY (MHz)GROUND PLANE SIZE VS RETURN LOSS 10dB FREQ.PART NUMBER DAK1575MS50FREQUENCY (MHz)159515901585158015751570Lower Freq.Upper Freq.156540 50 60 70 80 90 100SIZE OF SQUARE GROUND PLANE (mm)The information furnished by <strong>TOKO</strong>, Inc. is believed to be accurate and reliable. However, <strong>TOKO</strong> reserves the right to make changes or improvements in the design, specification or manufactureof its products without further notice. <strong>TOKO</strong> 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 otherrights 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 <strong>TOKO</strong>, Inc.<strong>TOKO</strong> SALES LOCATIONSToko America, Inc.1250 Feehanville Drive, Mt. Prospect, IL 60056Tel: (847) 297-0070 Fax: (847) 699-7864 Web: http://www.tokoam.comMidwest Regional OfficeToko America, Inc.1250 Feehanville DriveMount Prospect, IL 60056Tel: (847) 297-0070Fax: (847) 699-7864Western Regional OfficeToko America, Inc.2480 North First Street , Suite 260San Jose, CA 95131Tel: (408) 432-8281Fax: (408) 943-9790Eastern RegionalOfficeToko America, Inc.107 Mill Plain RoadDanbury, CT 06811Tel: (203)748-6871Fax: (203)797-1223© 1996 Toko, Inc.All Rights ReservedCF-149-DAKDS395Printed in the USA
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