TW4421 Wideband Dual-Feed GPS/GLONASS Antenna
This low-cost dual-feed GPS & GLONASS magnetic mount antenna by Tallysman Wireless covers 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 excellent multipath rejection and a more linear carrier phase response by virtue of the axial ratio that is greatly improved across the full frequency bandwidth. It is especially suited to high accuracy applications; it also offers high out-of-band signal rejection.
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The two feeds from the patch element are summed in a 90 degree hybrid then input to a first-stage Low-Noise Amplifier (LNA), followed by a mid-section SAW and a second low-noise gain stage.
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The TW4421 is one of the smallest dual-feed, high-performance antennas available. It comes with a wide range of connector options and cable length and is housed in a compact IP67 magnetic mount enclosure.
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If you want a pre-filter option, please see the TW4422. It has a pre-filter which increases the antennas immunity to high amplitude interfering signals, such as LTE and other cellular signals
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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: 3 dB Max. (GPS & GLONASS)
- Low noise LNA: 1 dB
- High rejection mid-section SAW filter
- High gain: 28 dB typ.
- Wide voltage input range: 2.5 to 16 VDC
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
LNA Pre-filter Available
If you need enhanced protection against high level sub-harmonic signals like LTE and near frequency signals such as WiFi, the alternative provides these additional TW4422 benefits with an LNA pre-filter.
To minimize performance impact from signal jamming threats, the pre-filtered version of this antenna is compatible with Tallysman’s Anti-Jamming add-on, which modifies the radiation pattern of the GNSS antenna to eliminate signals arriving from -10° to +15° from horizon, while slightly increasing the gain of the antenna at zenith.
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