A Tallysman
Accutenna™
TW1421 Compact Dual Feed Embedded GPS/GLONASS Antenna
The TW1421 employs Tallysman’s unique
Accutenna™
technology covering the GPS L1, GLONASS G1, and SBAS
(WAAS, EGNOS & MSAS) frequency band (1574 to 1606
MHz). It provides truly circular response over its entire
bandwidth thereby producing superior multipath signal
rejection. 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.
Applications
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High Accuracy GPS & GLONASS
Precision Agriculture, Mining & Construction
Military & Security
Avionics
Law Enforcement & Public Safety
Fleet Management & Asset Tracking
Features
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Compact Dual Feed Patch Element
1dB bandwidth 1575-1606MHz
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
Temperature Compensated Gain
Benefits
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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
TW1421 High Gain Dual Feed Embedded GPS/GLONASS Antenna
Specifications
At; Vcc = 3V, over full bandwidth, T=25°C
Antenna
Architecture
1 dB Bandwidth
Antenna Gain (with 100mm ground plane)
Axial Ratio over full bandwidth
Dual, Quadrature Feeds
31MHz
4.5dBic
≤
3dB max
Electrical
Architecture
Filtered LNA Frequency Bandwidth
Polarization
LNA Gain
Gain flatness
Out-of-Band Rejection
One LNA per feed line, mid-section SAW filter
1574MHz to 1606MHz
RHCP
28dB typ., 26dB Min, 1575.42MHz to 1606MHz
+/- 2dB, 1575MHz to 1606MHz
<1500MHz:
>32dB
<1550MHz:
>25dB
>1640MHz:
>35dB
<1.5:1
≤1.25dB typ.
+2.5 VDC to 16 VDC nominal
15mA typ, 25m Max (85°C)
15KV air discharge
35mm dia. x 7.25mm
1.38mm OD (micro-coax) or 2.6mm OD (RG174)
-40°C to +85°C
18g
Adhesive or M2 screw mount
RoHS compliant
Vertical axis: 50G, other axes: 30G
3 axis, sweep = 15 min, 10 to 200Hz sweep: 3G
One year – parts and labour
VSWR (at LNA output)
Noise Figure
Supply Voltage Range (over coaxial cable)
Supply Current
ESD Circuit Protection
Mechanicals & Environmental
Mechanical Size
Cable
Operating Temp. Range
Weight
Attachment Method
Environmental
Shock
Vibration
Warranty
Ordering Information
Legacy Part Numbers:
TW1421T – OEM Dual Feed antenna,
TW1421S – OEM Dual Feed antenna,
with 2.72 mm can
with 2.0 mm can
32-1421T-xx –yyyy-zz
32-1421S-xx –yyyy-zz
Connector:
xx = 00 SMA male ,
01 = TNC male
02 = MCX male
03 = MMCX male 04 = SMB male
05 = MCX right angle male 06 = MMCX right angle male 07 = SMA female
08 = H.FL**
09 = U.FL
10 = SMA R/A**
11 = Reverse polarity SMA** ** Premiums apply. Please contact your Distributor
Cable length: yyyy = cable length in mm
Custom Tuning: zz = Assigned by Tallysman
* As a result of a growing product portfolio, Tallysman has rationalized its part number system. No changes have been made to the
mechanical or electrical properties of these products. Where administratively possible, please use the following Part Numbers.
TW1421T – GPS L1 antenna,
33-1421-xx-yyyy-zz
TW1421S
33-1421S-xx-yyyy-zz
Please refer to the Ordering Guide
(http://www.tallysman.com/orderingguide.php)
for the current and complete list of available
connectors.
Tallysman Wireless Inc
106 Schneider Road, Unit 3
Ottawa ON K2K 1Y2 Canada
Tel 613 591 3131
Fax 613 591 3121
sales@tallysman.com
The information provided herein is intended as a guide only and is subject to change without notice. This document is not to be regarded as a
guarantee of performance. Tallysman Wireless Inc. hereby disclaims any or all warranties and liabilities of any kind. © 2011 Tallysman Wireless Inc.
All rights reserved.
Rev 3.2
Embedded System
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