TW4421-00

## A Tallysman _Accutenna™_ TW4421 Wideband Dual Feed GPS/GLONASS Antenna 

The TW4421 employs Tallysman’s unique _Accutenna™_ technology covering the GPS L1, GLONASS G1, and SBAS (WAAS, EGNOS & MSAS) frequency band (1574 to 1606 MHz).  The TW4421 features a novel 25mm dual feed wideband patch element that provides a more linear carrier phase response by virtue of the axial ratio that is greatly improved across the full frequency bandwidth.  It provides truly circular response over its entire bandwidth thereby producing superior multipath signal rejection.  It is especially suitable for high accuracy applications, and also offers high out of band signal rejection. 

The two feeds from the patch element are summed in a 90° Hybrid then input to a first stage Low Noise Amplifier (LNA), followed by a mid-section SAW and a second low noise gain stage. 

The TW4421 is the smallest dual feed, high performance antenna available.  It is housed in a compact IP67 magnetic or adhesive mount enclosure.  It is available with a wide range of cable and connector options. 

The antenna can be ordered without the magnet.  In such cases, the magnet is replaced with a plastic plug to provide a smooth under surface, with the option of ordering it with or without 1.1 mm doublesided VHB tape on the bottom. 

## **Applications** 

- Cost Sensitive Mission Critical Positioning 

- Military & Security 

- Covert surveillance 

- Fleet Management & Asset Tracking 

## **Features** 

- Dual feed patch element 

- 40% wider bandwidth, small footprint 

- Axial ratio: 2.5 dB Max. (GPS & GLONASS) 

   - Low noise LNA: 1 dB 

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   - High rejection mid-section SAW filter 

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- High gain:  28 dB typ. 

- Wide voltage input range: 2.5 to 16 VDC 

   - IP67 weather proof housing 

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## **Benefits** 

   - 1dB Bandwidth Includes GPS-L1 & GLONASS 

   - Greatly enhanced multipath rejection 

   - Improved GNSS reliability 

   - Excellent signal to noise ratio 

   - RoHS compliant 

   - Ideal for harsh environments 

   - Excellent out of band signal rejection 

- Low Power:  9mA typ. at 2.3Vcc min. 

## TW4421 Wideband Dual Feed GPS/GLONASS Antenna 

**Specifications** At;  Vcc = 3V, over full bandwidth, T=25°C 

## **Antenna** 

Architecture 1 dB radiated power bandwidth (RHCP) Antenna Gain (with 100mm ground plane) Axial Ratio over full bandwidth, Polarization 

Wideband Dual Feed Patch Element 32 MHz 4.5 dBic <1.5 dB @zenith, ≤2.5dB max RHCP 

## **Electrical** 

Architecture Dual Feed Patch -> Hybrid->LNA stage 1 -> SAW filter-> LNA stage 2 Filtered LNA Frequency Bandwidth 1575 to 1606 MHz Gain 28dB min, 1575 MHz to 1606MHz Gain flatness +/- 2dB, 1575 MHz to 1606MHz Out-of-Band Rejection <1500MHz >32dB <1550MHz >25dB >1640MHz >35dB VSWR (at LNA output) <1.5:1 Noise Figure 1.0dB typ. Supply Voltage Range (over coaxial cable) +2.5VDC to 16VDC nominal (12VDC recommended maximum) Supply Current 10mA typ. 15mA max. (@ 85°C) ESD Circuit Protection 15KV air discharge **Mechanicals & Environmental** Mechanical Size 38mm x 38mm dia. x 14.3mm High Cable RG174 Operating Temp. Range -40°C to +85°C Enclosure Radome and base: ASA plastic Weight 50gm (Enclosure + SMA connector 34gm, cable 0.31gm/cm) Attachment Method Magnetic or Adhesive Environmental IP67 and RoHS compliant Shock Vertical axis: 50G, other axes: 30G Vibration 3 axis, sweep = 15 min, 10 to 200Hz sweep: 3G Warranty One year, parts and labour 

## **Mechanicals & Environmental** 

## **Ordering Information** 

TW4421 – Wideband GPS Antenna 33-4421-xx-yyyy 

Please refer to the Ordering Guide ( http://www.tallysman.com/wp-content/uploads/Current-Ordering-Guide.pdf)) for the current and complete list of available radomes and 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. © 2010 Tallysman Wireless Inc.  All rights reserved. Rev 3.4