# RF Antenna, 1.602GHz, GPS / Glonass / Galileo / BeiDou / QZSS / GNSS / SBAS, 1.7dBi, 50ohm
**URL**: https://novapart.co/products/GPDF254.A/rf-antenna-1602ghz-gps-glonass-galileo-beidou-qzss
**SKU**: GPDF254.A
**Manufacturer**: TAOGLAS
**Price**: €12.6800
**Stock**: 100+
**Lead Time**: 120 days (indicative)
## Specifications
| Parameter | Value |
|---|---|
| Gain | 1.7dBi |
| Svhc | No SVHC (23-Jan-2024) |
| Vswr | - |
| Input Power | - |
| Antenna Type | GPS / Glonass / Galileo / BeiDou / QZSS / GNSS / SBAS |
| Frequency Max | 1.602GHz |
| Frequency Min | - |
| Product Range | - |
| Input Impedance | 50ohm |
| Antenna Mounting | Adhesive / Pin |
| Antenna Polarisation | Right Hand Circular |
## Datasheet
📄 [Download PDF](https://novapart.co/datasheet/farnell:4470184/)
+ v c ed a a a) + © C)
|1.|Introduction|3|
|---|---|---|
|2.|Specifications|4|
|3.|Passive Antenna Characteristics|6|
|4.|Radiation Patterns|11|
|5.|Field Test Data|15|
|6.|Mechanical Drawing|17|
|7.|Evaluation Board Mechanical Drawing|18|
|8.|Antenna Integration Guide|19|
|9.|Evaluation Board Matching Circuit|22|
|10. Packaging|10. Packaging|23|
||Changelog|24|
Taoglas makes no warranties based on the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and product descriptions at any time without notice. Taoglas reserves all rights to this document and
the information contained herein. Reproduction, use or disclosure to third parties without express permission is strictly prohibited.
www.taoglas.com
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## **1** . Introduction
The GPDF254.A is a high performance, single-band passive GNSS L1 antenna that has been carefully designed to provide fantastic positional accuracy on the full GNSS L1 spectrum. It has a dual feed, passive patch design which makes it ideal for next-generation GNSS devices that require excellent positional accuracy in a small form factor. The patch antenna, by means of a double resonance design, has a wide-band operation over GNSS systems including GPS (L1), GLONASS (G1), Galileo (E1) and BeiDou(B1). The 25 mm patch uses a dualfeed configuration to obtain an optimal axial ratio. The GPDF254.A is manufactured and tested in a TS16949 first tier automotive approved facility.
Typical applications include:
- High accuracy positioning and navigation systems
- UAVs, Robotics & Autonomous Vehicles
- Transportation & Telematics
- Precision Agriculture
- RTK Systems
The GPDF254.A is the latest embedded addition to Taoglas’ product portfolio of high precision GNSS antennas. When used on the base and/or the rover as part of an RTK configuration, the GPDF254.A can achieve genuine cm-level accuracy with proven results.
Full integration guidelines are contained in Section 8 of this datasheet including the Taoglas HC125.A hybrid coupler that will be required for use for dual pin feed patch integrations. Two active versions of this antenna, the ADFGP.25A.07.0100C – tuned for a 70*70mm Ground Plane and ADFGP.25E.07.0100C – tuned for free space is available and supplied with 100mm cable and I-PEX MHFI connector as standard.
Contact your local Taoglas Customer Services team for more information on any of the products listed above or for support regarding integration.
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## **2.** Specifications
|**GNSS Frequency Bands Covered**|**GNSS Frequency Bands Covered**|**GNSS Frequency Bands Covered**|**GNSS Frequency Bands Covered**|**GNSS Frequency Bands Covered**|**GNSS Frequency Bands Covered**|
|---|---|---|---|---|---|
|**GPS**|L1|L2|L5|||
||▓|□|□|||
|**GLONASS**|G1|G2|G3|||
||▓|□|□|||
|**Galileo**|E1|E5a|E5b|E6||
||▓|□|□|□||
|**BeiDou**|B1|B2a|B2b|B3||
||▓|□|□|□||
|**QZSS (Regional)**|L1|L2C|L5|L6||
||▓|□|□|□||
|**IRNSS**
**(Regional)**|L5|||||
||□|||||
|**SBAS**|L1/E1/B1|L5/B2a/E5a|G1|G2|G3|
||▓|□|▓|□|□|
*SBAS systems: WASS(L1/L5), EGNOSS(E1/E5a), SDCM(G1/G2/G3), SNAS(B1,B2a), GAGAN(L1/L5), QZSS(L1/L5), KAZZ(L1/L5).
## GNSS Bands and Constellations
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||**GNSS Electrical**|**GNSS Electrical**|**GNSS Electrical**|
|---|---|---|---|
|**Frequency (MHz)**|**1561**|**1575.42**|**1602**|
|Return Loss (dB)|< -10|< -10|< -10|
|Efficiency (%)|39.6|53.8|38|
|Peak Gain (dBi)|1.4|3.1|1.7|
|Average Gain (dB)|-4|-2.7|-4.2|
|Axial Ratio (dB)|0.9|0.7|0.54|
|Polarization|R.H.C.P.|||
|Impedance|**50**Ω|||
Note. The patch antenna is tested with hybrid coupler HC125 and tuned on 70x70(mm) ground plane.
||**Mechanical**|
|---|---|
|Ceramic Dimension|25 x 25 x 4.0 mm|
|Pin Length|2.4mm|
|Weight|9.7 g|
||**Environmental**|
|Operation Temperature|-40°C to 85°C|
|Storage Temperature|-40°C to 85°C|
|Humidity|Non-condensing 65°C 95% RH|
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## **3.** Passive Antenna Characteristics
## **3.1** Return Loss for single pin without coupler ff
**==> picture [462 x 242] intentionally omitted <==**
**----- Start of picture text -----**
0
-5
-10
-15
-20
-25
1400 1450 1500 1550 1600 1650 1700 (MHz)
(dB)
**----- End of picture text -----**
## 4 **3.2** Return Loss For dual pin with coupler
**==> picture [460 x 221] intentionally omitted <==**
**----- Start of picture text -----**
0
-5
-10
-15
-20
-25
1400 1450 1500 1550 1600 1650 1700 (MHz)
(dB)
**----- End of picture text -----**
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## of **3.3** Efficiency for single pin without coupler
**==> picture [456 x 267] intentionally omitted <==**
**----- Start of picture text -----**
100%
90%
| | | |hE
80%
| | | |6
70%
_| | | | ee
60%
ee ee ee ee
50%
_ | | | |ING
40%
— | | | |UO
30%
— | | | |OYUN
20%
_ | | | TY [EN]
10%
| | YY a SN
aOS
0%
1.40 1.44 1.48 1.51 1.55 1.59 1.63 1.66 1.70
Frequency [GHz]
**----- End of picture text -----**
## **3.4** Efficiency for dual pin with coupler ff
**==> picture [451 x 268] intentionally omitted <==**
**----- Start of picture text -----**
100%
90%
P| ft | tt a |
80%
P|} |} tt Ta
70%
P|} |} tt Ta
60%
P|} | tt Ta
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50%
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10%
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Seeeee)
0%
| ae
1.40 1.44 1.48 1.51 1.55 1.59 1.63 1.66 1.70
Frequency [GHz]
**----- End of picture text -----**
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## **3.5** Average Gain for single pin without coupler of
**==> picture [455 x 267] intentionally omitted <==**
**----- Start of picture text -----**
0
-1
-2
_ || | | | Eeee |
-3
_ | | | YIN
| | | |he
-4
| | | | AR |
-5
-6
_ | | | /ERY |
-7
_ | | | f/ A
-8
_ | | |/ Eee \
-9
| | | YY Eee \
-10
— | | yf Ee A
1.40 1.44 1.48 1.51 1.55 1.59 1.63 1.66 1.70
Frequency [GHz]
**----- End of picture text -----**
## | **3.6** Average Gain for dual pin with coupler
**==> picture [474 x 267] intentionally omitted <==**
**----- Start of picture text -----**
0
-1
ei; | i ft | | Ta
eee) ae
-2
-3 | | | | | | | ee
-4
| | | | | |)
| | | | | |LAR
-5
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| | | | | AT A
-7
-8 | | i | | |TN
-9
| | i | | Tf | A
-10
i | i | | 7) [PN]
1.40 1.44 1.48 1.51 1.55 1.59 1.63 1.66 1.70
Frequency [GHz]
**----- End of picture text -----**
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## **3.7** Peak Gain for single pin without coupler _
**==> picture [462 x 267] intentionally omitted <==**
**----- Start of picture text -----**
5
| | | | im | |
4
|
3
2
| | | | | Qa ||
1
| | | | | ARR |
| | | | /TR, ||
0
-1
-2
| | | |} UY UA
-3
| | | | | /f/ PT m \NV
-4
| |
-5
| | | | fsYY EeJ AIN
1.40 1.44 1.48 1.51 1.55 1.59 1.63 1.66 1.70
Frequency [GHz]
**----- End of picture text -----**
## **3.8** Peak Gain for dual pin with coupler 4
**==> picture [457 x 267] intentionally omitted <==**
**----- Start of picture text -----**
5
4
RRs 6) lh [hee]
eee) ae
3
eee eee) oO) eee
2
1
|| | | | | | | TL Ae
0
|| | | |) | | VSN
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|| | | |) | dT A a A
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|| | | | |] | l/ | aN
-3
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|| | | | | dt) | a AT
-5
|| | | td) UY Ta |
1.40 1.44 1.48 1.51 1.55 1.59 1.63 1.66 1.70
Frequency [GHz]
**----- End of picture text -----**
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**==> picture [475 x 315] intentionally omitted <==**
**----- Start of picture text -----**
3.9 Axial Ratio at Phi=0
_
phi = 0
9.0
TE
eseeeee
6.0
ee [ee][eee] |
ey eeee|
eeee
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3.0
ee
Sf SwAY
ST NAS EN YY
NE
0.0
-180 -120 -60 0 60 120 180
Angle [Deg]
1575.42MHz 1561MHz 1602MHz
**----- End of picture text -----**
## **3.10** Axial Ratio at Phi=90 _
**==> picture [464 x 281] intentionally omitted <==**
**----- Start of picture text -----**
phi = 90
9.0
A |
Oe | ee ee
|
EW
6.0
NW
ee eee
|
3.0
a Ae
am)
4) \Gee en
AP VNeeeZNVES
0.0
-180 -120 -60 0 60 120 180
Angle [Deg]
1575.42MHz 1561MHz 1602MHz
**----- End of picture text -----**
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## **4.** Radiation Patterns
**==> picture [102 x 13] intentionally omitted <==**
**----- Start of picture text -----**
4.1 Test Setup
**----- End of picture text -----**
**==> picture [60 x 103] intentionally omitted <==**
**----- Start of picture text -----**
Y
X
Z
**----- End of picture text -----**
Note. The patch antenna test with hybrid coupler HC125.A and tuned on 70x70(mm) ground plane.
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## **4.2** 1561MHz 3D and 2D Radiation Patterns
## XZ Plane
## YZ Plane
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**==> picture [289 x 11] intentionally omitted <==**
**----- Start of picture text -----**
4.3 1575.42MHz 3D and 2D Radiation Patterns
**----- End of picture text -----**
## XZ Plane YZ Plane ~~ee ee~~
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**==> picture [272 x 11] intentionally omitted <==**
**----- Start of picture text -----**
4.4 1602MHz 3D and 2D Radiation Patterns
**----- End of picture text -----**
## XZ Plane
## YZ Plane
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## **5.** Field Test Results
In this section Taoglas will present the field test result for GPDF254.A antenna. The test was performed when the antenna was mounted on a static rooftop test set up in an open sky environment for at least 6 hours.
Taoglas will show the field test results using the following receivers:
## **5.1** Ublox ZED-F9P
## Receiver features:
- Multi-band GNSS: 184-channel GPS L1C/A L2C, GLONASS: L1OF L2OF, Galileo: E1B/C E5b, BeiDou: B1I B2I, QZSS: L1C/A L2C
- Multi ‑ band RTK with fast convergence times and reliable performance
- Nav. update rate RTK up to 20 Hz
- Position accuracy = RTK 0.01 m + 1 ppm CEP
|**Positioning Accuracy Table(2D Accuracy)**
~~ee~~|**Positioning Accuracy Table(2D Accuracy)**
~~ee~~|**Positioning Accuracy Table(2D Accuracy)**
~~ee~~|**Positioning Accuracy Table(2D Accuracy)**
~~ee~~|**Positioning Accuracy Table(2D Accuracy)**
~~ee~~|**Positioning Accuracy Table(2D Accuracy)**
~~ee~~|
|---|---|---|---|---|---|
|**Test**
**Condition**
~~ee~~|**Correction**
**Service**
~~ee~~|**CEP (50%)**
~~ee~~|**DRMS (68%)**
~~ee~~|**2DRMS (95-98.2%)**
~~ee~~|**TTFF (sec)**
~~ee~~|
|**On**
**70*70mm**
**EVB**|RTK DISABLED|63.58 cm|79.96 cm|159.92 cm|18|
||RTK ENABLED|0.66 cm|0.79 cm|1.59 cm|18|
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## **5.2** Ublox NEO-M8P
## Receiver features:
- Multi-band GNSS: 72 channels ublox M8 engine
- GPS: L1 C/A GLONASS: L1OF BeiDou: B1, Not support RTK
- Nav. update rate up to 8 Hz (RTK)
- Carrier phase data up to 10Hz
- Position accuracy =
- Standalone: 2.5m CEP
- RTK 0.025 m + 1 ppm CEP
|•
**Positioning Accuracy Table(2D Accuracy)**|•
**Positioning Accuracy Table(2D Accuracy)**|•
**Positioning Accuracy Table(2D Accuracy)**|•
**Positioning Accuracy Table(2D Accuracy)**|•
**Positioning Accuracy Table(2D Accuracy)**|•
**Positioning Accuracy Table(2D Accuracy)**|
|---|---|---|---|---|---|
|**Test**
**Condition**|**Correction**
**Service**|**CEP (50%)**|**DRMS (68%)**|**2DRMS (95-98.2%)**|**TTFF (sec)**|
|**On**
**70*70mm**
**EVB**|RTK DISABLED|66.26 cm|81.71 cm|163.43 cm|30|
||RTK ENABLED|2.39 cm|3 cm|6.01 cm|30|
www.taoglas.com
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## **6.** Mechanical Drawing (Units: mm)
www.taoglas.com 17
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## **7.** Evaluation Board Mechanical Drawing (Units: mm)
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## **8.** Antenna Integration Guide
## **8.1** Integration Guide
Whatever the size of the PCB, the ideal location for the antenna is as illustrated in the below diagram; on the PCB’s shortest side, in the left corner. This allows placement of the optimized matching components alongside the antenna.
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## **8.2** PCB Layout =
The footprint and clearance on the PCB must comply with the antenna specification. The PCB layout shown in the diagram below demonstrates the antenna footprint.
## Topside
## Bottom Side
## **8.3** PCB Layout _
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**8.4** Schematic Symbol and Pin Definitions
The circuit symbol for the antenna is shown below. The antenna has 2 pins that are orthogonal feeds.
|Pin
~~EEE~~|Description
~~EEE~~|
|---|---|
|1|L1P1 (0°)|
|2|L1P2 (-90°)|
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## **9.** Evaluation Board Matching Circuit
The antenna patch element uses two orthogonal feeds that are combined in a hybrid coupler to ensure optimal axial ratio. A hybrid coupler is required for this antenna and should be included in the design. The hybrid coupler should be placed close to the antenna pins and terminated correctly using 2x 100 ohm resistors in parallel.
|**Matching Components**|**Matching Components**|**Matching Components**|**Matching Components**|
|---|---|---|---|
|Designator|Type|Value|Description|
|R1, R2|Resistor (0402)|100Ω (1%)|Yageo RT0402BRE07100RL|
|X1|Hybrid Coupler|HC125A|Taoglas|
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## **8.10. Packaging**
50pcs GPDF254.A per Tray Weight: 520g
200pcs GPDF254.A per Inner Carton Dimensions: 261*152*118 mm Weight: 2.5Kg
800pcs GPDF254.A per Carton Dimensions: 330*280*270 mm Weight: 10.2Kg
www.taoglas.com
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Changelog for the datasheet **SPE-20-8-101-A – GPDF254.A**
**Revision: B (Current Version)** Date: 2023-02-21 Changes: Updated GNSS Bands & Constellations Graphics Changes Made by: Cesar Sousa
## **Previous Revisions**
**Revision: A** Date: 2020-10-14 Changes: Initial Release Changes Made by: David Connolly
www.taoglas.com
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www.taoglas.com
© Taoglas
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## Links
- [View this product on Novapart](https://novapart.co/products/GPDF254.A/rf-antenna-1602ghz-gps-glonass-galileo-beidou-qzss)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/taoglas/gpdf254-a/rf-antenna-1-602ghz-1-7dbi-50/dp/4470184)
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