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The TW1421 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, 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 90oHybrid 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).
OEM antennas are easily detuned by the local environment. Tallysman offers custom tuning services for optimized integration into OEM end-user modules.
Applications Features Benefits
• High Accuracy GPS & GLONASS
• Precision Agriculture, Mining & Construction
• Military & Security
• Avionics
• Law Enforcement & Public Safety
• Fleet Management & Asset Tracking • Compact Dual Feed Patch Element
• 1dB bandwidth 1575-1606 MHz
• Very low noise LNA: <1.25 dB
• 3dB Axial Ratio @ zenith over bandwidth
• LNA gain: 28 dB typ.
• Wide Supply voltage: fixed 2.5V to 16V
• ESD circuit protection: 15KV • 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
Specifications
Vcc = 3V, over full bandwidth, T=25°C
Antenna 
Architecture Dual, Quadrature Feeds
1 dB Bandwidth 31MHz
Antenna Gain (with 100mm ground plane) 4.5d Bic
Axial Ratio over full bandwidth ≤3dB max 

Electrical 
Architecture One LNA per feed line, mid-section SAW filter
Filtered LNA Frequency Bandwidth 1574MHz to 1606MHz
Polarization RHCP
LNA Gain 28dB typ., 26dB Min, 1575.42MHz to 1606MHz
Gain flatness +/- 2dB, 1575MHz to 1606MHz
Out-of-Band Rejection
< 1500 MHz
< 1550 MHz
> 1640 MHz 
>32 dB
> 25 dB
> 35 dB
VSWR (at LNA output) <1.5:1
Noise Figure ≤1.25dB typ.
Supply Voltage Range (over coaxial cable) +2.5VDC to 16VDC nominal
Supply Current 15mA typ, 25m Max (85°C)
ESD Circuit Protection 15 KV air discharge
Mechanicals & Environmental 
Mechanical Size 35 mm dia. x 7.25mm
Cable 1.38mm OD
Operating Temp. Range -40 to +85 °C
Weight 30 g
Attachment Method Adhesive or M2 screw mount
Environmental RoHS compliant
Shock Vertical axis: 50 G, other axes: 30 G
Vibration 3 axis, sweep = 15 min, 10 to 200 Hz sweep: 3 G
Warranty One year, parts and labour