ALPDF254.07.0100C

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|1.|Introduction|3|
|---|---|---|
|2.|Specifications|4|
|3.|Antenna Characteristics|7|
|4.|Active Antenna Characteristics|14|
|5.|Radiation Patterns|20|
|6|Field Test Results|26|
|7.|Mechanical Drawing|29|
|8.|Packaging|30|
||Changelog|31|



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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## 1. Introduction 

The Taoglas ALPDF254 is an active L-Band patch antenna for use on the L-Band spectrum required for positioning correction services. The antenna exhibits excellent gain and good radiation pattern stability leading to a reliable performance, enabling a high precision GNSS receiver to reach accuracies down to centimeter level. The satellite L-band communication system allows GNSS correction service providers to broadcast a variety of services on specific channels, satellites and beams, and the ALPDF254 has been expertly designed to be used in conjunction with L-Band receivers. 

Typical applications include: 

- UAVs and Robotics 

- Autonomous Vehicles 

- Precision Agriculture 

The ALPDF254 includes LNAs and front-end SAW filters to reduce out of band noise, such as from nearby cellular transceivers. It offers better protection from nearby radiated power surges and greatly reduces the probability of damaging your receiver from nearby transmissions. The ALPDF254 has 1 cable feed as the two pin feeds are combined with a hybrid coupler to get the best possible axial ratio for L-Band applications. 

The cable and connector are fully customizable, subject to NRE and MOQ. For further information please contact your regional Taoglas customer support team. 

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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**|**GNSS Frequency Bands Covered**|
|---|---|---|---|---|---|---|
|**GPS**|L1|L2|L5||||
||□|□|□||||
|**GLONASS**|G1|G2|G3||||
||□|□|□||||
|**Galileo**|E1|E5a|E5b|E6|||
||□|□|□|□|||
|**BeiDou**|B1|B2a|B2b|B3|||
||□|□|□|□|||
|**L-Band**|L||||||
||▓||||||
|**QZSS**<br>**(Regional)**|L1|L2C|L5|L6|||
||□|□|□|□|||
|**IRNSS**<br>**(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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## **Electrical** 

|**Electrical**|**Electrical**||
|---|---|---|
|**Frequency (MHz)**|**1525-1559**||
|**Efficiency**|40%||
|**Average Gain**|-4.1dB||
|**Peak Gain**|1dBi||
|**Axial Ratio**|3dB||
|**Radiation Pattern**|Directional||
|**Polarization**|RHCP||
|**Impedance**|50Ω||
|**LNA and Filter Electrical Properties**|||
|**Frequency (MHz)**|**1525-1559**||
|**VSWR (max.)**|2:1||
|**Gain@1.8V ~ 5V**|28.4 dB||
|**Noise@1.8V ~5V**|2.0 dB||
|**Power consumption@1.8V ~5V**|4.9 mA||



## **Mechanical** 

|**Mechanical**|**Mechanical**|
|---|---|
|**Housing Dimensions**|35*35*8.3 mm|
|**Material**|Ceramic + PCB + Shielding Case|
|**Cable**|100mm 1.37mm Coax|
|**Connector**|I-PEX MHF®HT U.FL Compatible|
||**Environmental**|
|Temperature Range|-40°C to 85°C|
|Humidity|Non-condensing 65°C 95% RH|
|RoHS Compliant|Yes|
|REACH Compliant|Yes|



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## **3.** Antenna Characteristics 

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## **3.2** VSWR 

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## **3.3** Efficiency (%) 

## **3.4** Average Gain (dB) 

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## **3.5** Peak Gain (dBi) 

## **3.6** Axial Ratio 

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10.0<br>9.0<br>8.0<br>7.0<br>6.0<br>5.0<br>4.0<br>3.0<br>|| | | | Byft<br>2.0 Pe a<br>1.0<br>0.0<br>1.40 1.45 1.50 1.55 1.60 1.65 1.70<br>Frequency [GHz]<br>**----- End of picture text -----**<br>


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## **4.** Active Antenna Characteristics 

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LPDF254.A<br>a,<br>Antenna  \\ /<br>VV<br>Coaxial Cable<br>Hybrid  1 [ST]  SAW  1 [ST]  LNA  2 [ND]  SAW  2 [ND]  LNA<br>Coupler<br>| | | | 7<br>4.2 S12 Gain @3V<br>**----- End of picture text -----**<br>


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## **4.3** Out of Band Rejection 

## **4.4** S11-Output VSWR 

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## **4.5** S22-Input VSWR 

## **4.6** Noise Figure 

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**5.** Radiation Patterns 

**4.** 

**5.1** Test Setup – Free Space 

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## **5.2** 1542MHz 3D and 2D Radiation Patterns 

## XY Plane 

## XZ Plane 

## YZ Plane 

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## **6.** Mechanical Drawing 

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## **7.** Packaging 

## — 

mala 1pcs ALPDF254.07.0100C per Small PE Bag EF 100pcs ALPDF254.07.0100C  per Large PE Bag 300pcs ALPDF254.07.0100C per carton Dimensions - 370*370*300mm 300mm 370mm $ ~~s~~ 370mm 

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Changelog for the datasheet **SPE-23-8-282 – ALPDF254.07.0100C** 

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

Date: 2022-09-28 Notes: Initial Release Author: Jack Conroy 

**Previous Revisions** 

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**Revision: B** Date: 2020-05-28 Notes: Added Field Test Results Author: Victor Pinazo 

www.taoglas.com 

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