Tallysman Dual Feed Embedded GPS | GLONASS Antenna
The compact 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 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 optimised integration into OEM end-user modules.
The TW1421 is used in a number of devices, such as GPS compasses for marine applications and wearable devices for athlete performance monitoring.
- Compact Dual Feed Patch Element
- 1dB bandwidth 1575-1606 MHz
- Very low noise LNA: <1.25 dB
- 3dB Axial Ratio at zenith over bandwidth
- LNA gain: 28 dB typ.
- Wide Supply voltage: fixed 2.5V to 16V
- ESD circuit protection: 15KV