TW1421 Dual Feed Embedded GPS/GLONASS Antenna
The TW1421 by Tallysman Wireless is an OEM dual feed GPS & GLONASS antenna covering the GPS L1, GLONASS G1 and SBAS (WAAS, EGNOS & MSAS) frequency band (1574 to 1606 MHz). The dual feed architecture provides a low axial ratio, a very tight Phase Centre Variation (PCV), and is especially suitable for high accuracy applications, with excellent multipath rejection and a more linear carrier phase response. It also offers high out of band signal rejection.
The TW1421 features a novel 25mm wideband patch element with dual-feeds that are summed in a 90° Hybrid and input to a two stage Low Noise Amplifier (LNA),with a mid section SAW a second low noise gain stage. This configuration provides excellent axial ratio and cross-polarization rejection across the full frequency band.
The built-in 35mm circular ground plane should ideally be augmented with a local system ground plane or reflecting surface (DC connection not required).
There are two options: TW1421S which has a lower profile can, mico-coax cable, and a U.FL. connector; or TW1421T which has a taller can, RG174, and a choice of connectors.
OEM antennas are easily detuned by the local environment. Tallysman offers custom tuning services for optimized integration into OEM end-user modules.
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Applications
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Features
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Benefits
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High Accuracy GPS & GLONASS
UAV / UAS / Drones
Military & Security
Avionics
Law Enforcement & Public Safety
Fleet Management & Asset Tracking
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Accutenna™ technology
Very tight Phase Centre Variation (PCV)
1dB bandwidth 1575-1606 MHz
Very low noise LNA: <1.25 dB
<2.5dB Axial Ratio over bandwidth
Wide Supply voltage: fixed 2.5V to 16V
ESD circuit protection: 15KV
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Great multipath rejection
Increase system accuracy
Improved carrier phase linearity
Excellent signal to noise ratio
Great out of band signal rejection
Compact form factor
RoHS compliant
Reliable performance
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Specifications
Vcc = 3V, over full bandwidth, T=25°C
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Antenna
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Architecture
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Dual, Quadrature Feeds
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1 dB Bandwidth
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31MHz
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Antenna Gain (with 100mm ground plane)
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4.5d Bic
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Axial Ratio over full bandwidth (horizon to horizon)
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≤2.5dB max
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Electrical
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Architecture
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One LNA per feed line, mid-section SAW filter
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Filtered LNA Frequency Bandwidth
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1574MHz to 1606MHz
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Polarization
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RHCP
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LNA Gain
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28dB typ., 26dB Min, 1575.42MHz to 1606MHz
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Gain flatness
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+/- 2dB, 1575MHz to 1606MHz
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Out-of-Band Rejection
<1500 MHz
<1550 MHz
>1640 MHz
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>32 dB
>25 dB
>35 dB
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VSWR (at LNA output)
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<1.5:1
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Noise Figure
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≤1.25dB typ.
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Supply Voltage Range (over coaxial cable)
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+2.5VDC to 16VDC nominal (12VDC recommended maximum)
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Supply Current
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15mA typ, 25m Max (85°C)
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ESD Circuit Protection
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15 KV air discharge
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Mechanicals & Environmental
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Mechanical Size
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35 mm dia. x 7.25mm
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Cable
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1.38mm OD (micro-coax) or 2.6mm OD (RG174)
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Operating Temp. Range
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-40 to +85 °C
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Weight
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30 g
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Attachment Method
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Adhesive or M2 screw mount
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Environmental
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RoHS compliant
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Shock
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Vertical axis: 50 G, other axes: 30 G
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Vibration
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3 axis, sweep = 15 min, 10 to 200 Hz sweep: 3 G
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Warranty
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One year, parts and labour
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Ordering Information
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Legacy Product Numbers
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TW1421T
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OEM Dual Feed antenna, with 2.72 mm can – 32-1421T-xx –yyyy-zz
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TW1421S
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OEM Dual Feed antenna, with 2.0 mm can – 32-1421S-xx –yyyy-zz
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Connector: xx
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