SGPDF254B

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**Part No: SGPDF254B** 

**Description** 

GPS/GLONASS/GALILEO/BEIDOU Dual Feed Ceramic Patch SMD Antenna 

**Features:** 

GPS/GLONASS/GALILEO/BEIDOU Dual Feed Ceramic Patch SMD Antenna Bands Covered: 

• BeiDou (B1I) 1561MHz 

• GPS/QZSS (L1) 1575.42MHz 

• GLONASS (G1) 1602MHz Low profile at just 4mm in height Dual-feed SMD configuration Dimensions: 25 x 25 x 4mm 

RoHS & Reach Compliant 

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SPE-25-8-119-A 

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1. Introduction  3<br>2. Specification  4<br>3. Mechanical Drawing  6<br>4. Packaging  7<br>5. Antenna Integration Guide  8<br>6. Antenna Characteristics  16<br>7. Radiation Patterns  20<br>8. Solder Reflow Profile  24<br>Changelog  25<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 SGPDF254B is a single band passive GNSS patch covering GPS/GLONASS/BeiDou/Galileo measuring just 25mm x 25mm with a low-profile height of 4mm. The SGPDF254.A has been designed with a dual feed patch to enhance performance by improving multipath rejection so signals can be received and sent more clearly. 

The SGPDF254.A is mounted via SMD and includes an additional solder mask to enhance durability and prevent cracking due to heat expansion during high-volume, cost-sensitive assembly processes. 

Typical Applications Include: 

- Wearables 

- Asset Tracking 

- Navigation Systems 

The SGPDF Series can be manufactured in a TS16949 first-tier automotive-approved facility and tested to AECQ200 certification if required. Further to this, full PPAP and IMDS documentation can be provided upon request. Please discuss your quality and reliability requirements with our team prior to ordering. 

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**|||
|||||
|||||
||**B1I – 1561 MHz**|**L1/E1 - 1575.42 MHz**|**G1 – 1602 MHz**|
|**Frequency (MHz)**||||
|||||
||1559-1565|1565-1586|1596-1610|
|||||
|||||
|**Efficiency (%)**|19.8|41.9|37.3|
|||||
|||||
|**Average Gain (dB)**|-7.04|-3.78|-4.29|
|||||
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|**Peak Gain (dBi)**|-1.06|3.68|2.98|
|||||
|||||
|**Axial Ratio (dB)**|0.78|0.71|0.3|
|||||
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|**Polarization**|RHCP|||
|||||
|||||
|**Impedance**|50 Ω|||
|||||
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||***Tested on a 50x50mm Ground Plane**|||
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||**Mechanical**|
|---|---|
|||
|**Dimensions**|25mm x 25mm x 4mm|
|||
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|**Weight**|10 g ± 3%|
|||
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|**Material**|Ceramic|
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||**Environmental**|
|---|---|
|||
|**Operation Temperature**|-40°C to 105°C|
|||
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|**Storage Temperature**|-40°C to 105°C|
|||
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|**Relative Humidity**|Non-condensing 65°C 95% RH|
|||
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|**Moisture Sensitivity**|3 (168 hours)|
|||



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## **3.** Mechanical Drawing ee / 

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200 pcs/ Reel/ Vacuum bag 

200 pcs / Box Box: 350x340x67mm Weight: 2.55 ±3% Kg 

800 pcs / Carton Carton: 370x370x300mm Weight: 11 ±3% Kg 

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The following is an example on how to integrate the SGPDF254B into a design. This antenna has 11 pins, two pins are used for the L1 band. A Hybrid coupler (HC125A) is used to combine the feeds for the L1 band, to create a linear polarized signal at the output of the hybrid coupler. Taoglas recommends using a minimum of 70x70mm ground plane (PCB) to ensure optimal performance. 

Top and bottom view of Reference Design PCB. 

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## Schematic and Symbol Definition 

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Hybrid Coupler<br>(HC125A) on the PCB.<br>—<br>**----- End of picture text -----**<br>


Above are the 3D models of the SGPDF254B and HC125A on a Reference Design PCB. 

The circuit symbol for the SGPDF254B is shown below. The antenna has 11 pins as indicated below. 

|**Pin**|**Description**|
|---|---|
|1|L1 (0˚ )|
|2|L1(90˚ )|
|3-10|Ground|
|11|L5|



Above is a schematic symbol of SGPDF254B and a table of the pin definitions. 

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## **5.3** Schematic Layout ka 

The SGPDF254B uses two orthogonal feeds that need to be combined in a hybrid coupler to ensure optimal axial ratio and Linear Gain is achieved. Taoglas recommends our HC125A, a high-performance hybrid coupler specifically engineered for use with our multi feed patches. 

The HC125A is required for the high GNSS band of operation (1559-1610MHz) for this antenna. This hybrid coupler should be placed close to the antenna pins and terminated correctly using a 49.9 Ohm resistor. 

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TAOGLAS_SGPDF254B ANT1<br>TAOGLAS_HC125A<br>X1<br>R1<br>1 2<br>Transmission Line GND<br>___ — 49.9 _, | Ul<br>4 3<br>GND<br>=<br>GND<br>Designator Type Value Manufacturer Manufacturer Part Number<br>eeee<br>R1  Resistor  49.9 Ohms  YAGEO  RC0402FR-0749R9L<br>L1P1 GND GND GND GND GND GND GND GND GND L1P2<br>1 2 3 4 5 6 7 8 9 10 11<br>GND<br>5<br>**----- End of picture text -----**<br>


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## Antenna Footprint 

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Bottom Side<br>**----- End of picture text -----**<br>


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Top Side<br>**----- End of picture text -----**<br>


|**Pin**|**Description**|
|---|---|
|1|L1 (0°)|
|2-10|Ground|
|11|L1 (90°)|



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## Top Solder Paste 

## Top Solder Mask 

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## **5.7** Copper Clearance for SGPDF254B Ea 

The footprint and clearance on the PCB must comply with the antenna’s specification. The PCB layout shown in the diagrams below demonstrates the SGPDF254B clearance area for Pin 1 (L1P1(0˚ ) Pad) and Pin 11 (L1P2(90˚ ) Pad). The copper keep out area applies to the top layer and all internal layers. 

There should be a 5x3.7mm copper clearance area around the antenna pins on the PCB. 

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## Antenna Integration 

The SGPDF254B should be placed in the centre of the PCB to take advantage of the ground plane. The RF traces must maintain a 50 Ohm transmission line. Ground vias should be placed around the transmission lines and the copper clearance area. 

Bottom view of a PCB reference design, showing “Pi” matching network. 

Bottom view of the PCB reference design, showing transmission lines and integration notes. 

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## Final Integration 

The bottom side image shown below highlights the antenna connection to the hybrid coupler (HC125A). It shows the 49.9 Ohm terminating resistor necessary for the hybrid coupler (HC125A). Taoglas recommends using a minimum of 70x70mm ground plane (PCB) to ensure optimal performance. 

Top Side (SGPDF254B placement on 70x70mm Reference Design PCB) 

Bottom side (HC125A placement) 

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## Test Setup 

VNA Test Set-up 

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## Return Loss 

## VSWR 

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## Efficiency 

## Average Gain 

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## Peak Gain 

## Axial Ratio 

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## Test Setup 

Chamber Test Set-up 

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## Patterns at 1561 MHz 

## XZ Plane 

## YZ Plane 

## XY Plane 

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## Patterns at 1575 MHz 

## XZ Plane 

## YZ Plane 

## XY Plane 

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## Patterns at 1602 MHz 

## XZ Plane 

## YZ Plane 

## XY Plane 

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The SGPDF254B can be assembled by following the recommended soldering temperatures are as follows: 

*Temperatures listed within a tolerance of +/- 10º C 

Smaller components are typically mounted on the first pass, however, we do advise mounting the SGPDF254B when placing larger components on the board during subsequent reflows. 

Note: Soldering flux classified ROL0 under IPC J-STD-004 is recommended. 

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Changelog for the datasheet 

**SPE-25-8-119 – SGPDF254B** 

**Revision: A (Original First Release)** Date: 2025-04-10 Notes: Initial Release Author: Gary West 

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