SGPDF254.A

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GNSS Surface Mount Patch Antenna 

**Part No: SGPDF254.A** 

**Description** 

GPS/GLONASS/BeiDou/Galileo SMD Dual Feed Patch Antenna 

**Features:** 

Embedded Dual-Feed Patch for Lowest Axial Ratio 

Covers Bands: 

- GPS L1C 

- GLONASS L1 

- Galileo E1 

- BeiDou B1 SMD Antenna – No Cable and Connector Required Dimension: 25*25*4mm 

Designed for a 70x70mm Ground plane RoHS & Reach Compliant 

SPE-23-8-189-A 

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1. Introduction  2<br>2. Specification  3<br>3. Antenna Characteristics  5<br>4. Radiation Patterns  6<br>5. Mechanical Drawing  15<br>6. Antenna Integration Guide  16<br>7. Packaging  23<br>8. Solder Reflow Profile  25<br>Changelog  24<br>**----- End of picture text -----**<br>


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. 

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The Taoglas SGPDF254.A is a single band active GNSS patch covering GPS/GLONASS/BeiDou/Galileo. The SGPDF254.A has been designed with a dual pin patch to enhance performance by improving multipath rejection so signals can be received and sent more clearly. 

The SGPDF254.A is mounted via SMD process via tape and reel for ease of installation, reflow information can be found within the datasheet. 

As with many high performance Taoglas patches, the series is produced in a TS16949 automotive quality approved facility, and each patch produced is 100% tested for gain (S21) and return loss (S11) to ensure total consistency of performance. 

Typical Applications Include: 

- Wearables 

- Asset Tracking 

- Navigation Systems 

Taoglas also offers custom tuning service based on minimum order quantities, contact your regional Taoglas customer support team for further information. 

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|**GNSS Frequency Bands**|**GNSS Frequency Bands**|**GNSS Frequency Bands**|**GNSS Frequency Bands**|**GNSS Frequency Bands**|**GNSS Frequency Bands**|
|---|---|---|---|---|---|
|**GPS**|**L1**<br>**1575.42 MHz**|**L2**<br>**1227.6 MHz**|**L5**<br>**1176.45 MHz**|||
||◼|||||
|**GLONASS**|**G1**<br>**1602 MHz**|**G2**<br>**1248 MHz**|**G3**<br>**1207 MHz**|||
||◼|||||
|**Galileo**|**E1**<br>**1575.24 MHz**|**E5a**<br>**1176.45 MHz**|**E5b**<br>**1201.5 MHz**|**E6**<br>**1278.75 MHz**||
||◼|||||
|**BeiDou**|**B1C**<br>**1575.42 MHz**|**B1I**<br>**1561 MHz**|**B2a**<br>**1176.45 MHz**|**B2b**<br>**1207.14 MHz**|**B3**<br>**1268.52 MHz**|
||◼|◼||||
|**L-Band**|**L-Band**<br>**1542 MHz**|||||
||◼|||||
|**QZSS (Regional)**|**L1**<br>**1575.42 MHz**|**L2C**<br>**1227.6 MHz**|**L5**<br>**1176.45 MHz**|**L6**<br>**1278.75e6**||
||◼|||||
|**IRNSS (Regional)**|**L5**<br>**1176.45 MHz**|||||
|||||||
|**SBAS**|**L1/E1/B1**<br>**1575.42 MHz**|**L5/B2a/E5a**<br>**1176.45 MHz**|**G1**<br>**1602 MHz**|**G2**<br>**1248 MHz**|**G3**<br>**1207 MHz**|
||◼||◼|||



## GNSS Bands and Constellations 

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|||||
|---|---|---|---|
||**GNSS Electrical**|||
|||||
|||||
|**Frequency (MHz)**|**1561**|**1575.42**|**1603**|
|||||
|||||
|**Efficiency (%)**|30.3|61.8|50.7|
|||||
|||||
|**Average Gain (dB)**|-5.19|-2.09|-2.95|
|||||
|||||
|**Peak Gain (dBi)**|1.23|4.36|3.55|
|||||
|||||
|**Impedance**|50 Ω|||
|||||
|||||
|**Polarization**|Linear|||
|||||
|||||
|**Radiation Pattern**|Directional|||
|||||



||**Mechanical**|
|---|---|
|**Ceramic Dimension (mm)**|25 x 25 x 4|
|**Weight (g)**|2g|
|**Material**|Ceramic|
|||
||**Environmental**|
|**Operation Temperature**|-40°C to 85°C|
|**Humidity**|Non-condensing 65°C 95% RH|
|**Moisture Sensitivity Level (MSL)**|3 (168 Hours)|



* Antenna properties were measured with the antenna mounted on 70*70mm Ground Plane. 

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## S11 / VSWR / Return Loss Test Setup 

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## **3.2** Return Loss | 

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0<br>-10<br>opeeee ee |<br>LLLSS > ie<br>-20 oo<br>PE)|<br>-30<br>1400 1425 1450 1475 1500 1525 1550 1575 1600 1625 1650 1675 1700<br>Frequency [MHz]<br>VSWR<br>4<br>6.0<br>SERRE) Le<br>5.0 SERRE eee |) h)) [LL]<br>SRR)<br>Sees<br>4.0 |) | eee<br>SRR)<br>Sees<br>3.0 |) | eee<br>SRR)<br>Sees<br>2.0 |) | eee<br>SSSSSSG00000)<br>Li EP oe eee| SOSceen<br>1.0<br>1400 1425 1450 1475 1500 1525 1550 1575 1600 1625 1650 1675 1700<br>Frequency [MHz]<br>**----- End of picture text -----**<br>


## **3.3** VSWR | 4 

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## **3.4** Efficiency _ 

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100%<br>90%<br>PTET ET TT TT TTTT<br>80%<br>TELE TTT TTT TT<br>70%<br>TEE TTT TT TT TA<br>Tee TT TT TT<br>60%<br>SERRE ERR ee) en eee<br>50%<br>40%<br>TET ET TT TT TT Te<br>30%<br>TEE TTT TT TT TN TT<br>20%<br>Tei t TTT TT TT VIS PT<br>10%<br>Tet TT TT ey IS NAS TT<br>tit<br>0%<br>ti | | US| | AE<br>1400 1425 1450 1475 1500 1525 1550 1575 1600 1625 1650 1675 1700<br>Frequency [MHz]<br>**----- End of picture text -----**<br>


## **3.5** Average Gain _ 

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## **3.6** Peak Gain _ 

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10.0<br>| | | | | | | | | | | | | ES ES PP<br>ee ee<br>8.0<br>| | | | | | | | | | | | | ES ES PP<br>ee ee<br>6.0<br>| | | | | | | | | | | | | SNS | | TT<br>2<br>4.0<br>| | | | | | ft | Tl ht ht | UAT Ee<br>2.0 2 eee<br>0.0 po | | | PE A EN<br>| | | | | | | | | tT | | UYU EN<br>-2.0 ee ee ee ee ee ee<br>| | | | | | ft | cE hr | UY | e e NN<br>a e<br>-4.0<br>| [| | | { [| | | | | Yl | YRS yy fT TNT ft<br>-6.0 ee ee ee eeeeee<br>| | | | | | ft | cP am ld UT heeeee<br>-8.0 ee ee ee ee ee eee eee ee Se<br>| | | | | | tl PAP TT | | eeeI<br>ee<br>-10.0 eee eee) ne nee eee<br>1400 1425 1450 1475 1500 1525 1550 1575 1600 1625 1650 1675 1700<br>Frequency [MHz]<br>Axial Ratio vs Frequency<br>9.0<br>BRRRRERRRREe)61 Re<br>Piteeeeeeeeee|| | eee<br>Poeeeeeeeeeee))<br>6.0<br>6) ee<br>SRRRRRRRRe)61 Re<br>SRRRRERREeees)61 Ee<br>3.0<br>SERREREREEEEE| |) EERE<br>eee<br>SRRRRRGeeeees)<br>0.0<br>PTET ELT TTT TT TR| eeeTP<br>1400 1425 1450 1475 1500 1525 1550 1575 1600 1625 1650 1675 1700<br>Frequency [MHz]<br>**----- End of picture text -----**<br>


## **3.7** Axial Ratio vs Frequency nay 

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## **3.8** Axial Ratio @1561MHz | 

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## **3.9** Axial Ratio @1575MHz | 

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**3.10** Axial Ratio @1602MHz 7 

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## Test Setup 

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Y<br>X  Z<br>**----- End of picture text -----**<br>


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## Radiation Patterns @1561MHz 

## XY Plane 

## XZ Plane 

## YZ Plane 

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## Radiation Patterns @1575MHz 

## XY Plane 

## XZ Plane 

## YZ Plane 

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## Radiation Patterns @1602MHz 

## XY Plane 

## XZ Plane 

## YZ Plane 

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## **6.1** Schematic Symbol and Pin Definition nay 

The circuit symbol for the antenna is shown below. The antenna has 11 pins as indicated below. 

|Pin<br>~~Po~~|Description|
|---|---|
|1<br>~~Po~~|RF Feed (Position 1)|
|2-10|Ground|
|11|RF Feed (Position 2)|



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## **6.2** Antenna Integration ay 

The antenna should be placed at the center of the ground plane with a length and width of 70mm. Maintaining a square symmetric ground plane shape and symmetric environment around the antenna is critical to maintaining the excellent axial ratio and phase center performance shown in this datasheet. The opposite side of the PCB from the antenna may be used for device electronics and does not need to maintain symmetry. 

Bottom Side with Solder Mask 

Top Side without Solder Mask 

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## 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 

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## Evaluation Board 

Topside 

Bottom Side 

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## Footprint 

Each patch element uses an orthogonal feed that needs to be combined in a hybrid coupler to ensure optimal axial ratio. Taoglas recommends our HC125.A, a high-performance hybrid 

coupler specifically engineered for use with our multi feed patches. The HC125.As is required for this antenna. This hybrid coupler should be placed close to the antenna pins and terminated correctly using a 49.9ohm resistor in parallel. 

The output of the hybrid coupler can feed into a path for GNSS filtering and amplification 

|**Designator**|**Type**|**Value**|**Manufacturer**|**Manufacturer**<br>**Part Number**|
|---|---|---|---|---|
|R1|Resistor|49.9<br>Ohms|Panasonic Electronic<br>Components|ERJ-2RKF49R9X|



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## Footprint 

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The SGPDF254.A can be assembled by following the recommended soldering temperatures are as follows: 

The is not limited to the number of passes through the reflow process. Smaller components are typically mounted on the first pass, however, we do advise mounting the when placing larger components on the board during subsequent reflows. 

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The SGGB254.A performance varies at different ground plane sizes, the results are shown in this section 

## **9.1** a 

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VSWR<br>**----- End of picture text -----**<br>


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5.0<br>4.0<br>3.0<br>2.0<br>He<br>1.0<br>1400 1425 1450 1475 1500 1525 1550 1575 1600 1625 1650 1675 1700<br>Frequency [GHz]<br>==<br>70X70(mm) 50X50(mm) 35X35(mm) 25X25(mm)<br>Efficiency<br>100%<br>80%<br>60%<br>h\\<br>40%<br>\\\<br>20%<br>y\\<br>0%<br>1400 1425 1450 1475 1500 1525 1550 1575 1600 1625 1650 1675 1700<br>Frequency [GHz]<br>**----- End of picture text -----**<br>


## **9.2** Efficiency a 

70X70(mm) 50X50(mm) 35X35(mm) 25X25(mm) 

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## **9.3** Peak Gain | 

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9.4 Efficiency<br>|<br>0.0<br>LEE<br>-2.0<br>pitt EE | ee<br>SERRERRRReees)\\\\ Reeeeee<br>SRRReeeeeeeee<br>-4.0<br>|) aoe<br>LEESEEReeeeeeeeI<br>-6.0<br>BERR |) \\\ See<br>pp RRER Ree)hee<br>-8.0<br>LEEEN| ||<br>SeeeeeeeeeIRIN<br>-10.0<br>ie) 2 ee<br>1.40 1.43 1.45 1.48 1.50 1.53 1.55 1.58 1.60 1.63 1.65 1.68 1.70<br>Frequency [GHz]<br>70X70(mm) 50X50(mm) 35X35(mm) 25X25(mm)<br>**----- End of picture text -----**<br>


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Changelog for the datasheet 

**SPE-23-8-189- SGPDF254.A** 

## **Revision: A (Original First Release)** 

Date: 2023-06-22 Notes: Initial Release Author: Gary West 

## **Previous Revisions** 

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