EAHP.125.01.0100D

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All-band GNSS Embedded Quad Helix Antenna 

**Part No: EAHP.125.01.0100D** 

**Description** 

Embedded Active Quad Helix Antenna for GNSS L1/L2/L5/L6 with L-Band 

**Features:** 

Supports GPS L1/L2/L5, Galileo L1/E5/E5a/E5b, GLONASS G1/G2/G3, BeiDou B1/B2a/B2b, and upper L-band (1540-1555MHz) Input voltage : 2.0 - 5.5V Dimensions: Ø60mm * 31.52mm Cable: 100mm RG-174 Connector: SMA(M) Custom Cables and Connectors Available RoHS & Reach Compliant 

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1. Introduction  3<br>2. Specification  4<br>3. Antenna Characteristics  6<br>4. Radiation Patterns  14<br>5. Mechanical Drawing  21<br>6. Packaging  22<br>7. Installation Guidelines  23<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 EAHP.125 is an embedded all-band GNSS Quadrifilar Helix antenna. It covers the full GNSS L1/L2/L5/L6 spectrum while also covering the L-Band for correction services deployed by U-Blox and other providers. The EAHP.125 has right hand circular polarization which improves sensitivity, rejecting left hand circular polarized reflections commonly experienced in urban environments. 

The EAHP.125 is a dual stage active GNSS antenna, thus saving time for the customer as they don’t need to create a complicated active circuit to be used in conjunction with their GNSS receiver/module, for multiband GNSS this can be a difficult process so it will save design time for users. 

The EAHP.125 is extremely compact at just 31.5mm in height and 60mm in diameter. It is also very lightweight due to its lightweight construction. The height and weight constraints of many devices often don’t allow for a large ceramic antenna. For example, UAVs and other robotic applications often will have weight restrictions to maximize battery life and, so the optimum solution is the EAHP.125. 

Typical Applications include: 

- UAVs and Drones 

- Robotics and Autonomous 

- Transportation 

- Aerospace 

- Surveying 

The EAHP.125 installation method is detailed in section 7 of this datasheet and requires an adhesive pad (supplied with the antenna) to ensure the antenna is secured in place when it is installed in a device. Any movement of the antenna within the device may cause damage to the antenna which will affect performance. Contact Taoglas if you are unsure of any installation requirements or require more details. 

The cable and connector are fully customizable, for further information please contact your Regional Taoglas Customer support team. 

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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**||||||
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|**Frequency (MHz)**|**1176.45**|**1227.6**|**1542**|**1561**|**1575.42**|**1603**|
||||||||
|**Passive Antenna**|||||||
||35.7|33.25|57.2|58.11|55.33|49.94|
|**Efficiency (%)**|||||||
||||||||
|**Passive Antenna Gain**|||||||
||0.0|-0.08|0.74|0.42|1.74|1.65|
|**at Zenith (dBic)**|||||||
||||||||
||||||||
|**Axial Ratio (dB)**|1.19|1.02|1.03|2.15|2.01|0.64|
||||||||
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|**PCO (cm)**|0.59|0.51|0.26|0.25|0.22|0.19|
||||||||
||||||||
|**PCV (cm)**|1.08|1.0|0.96|0.86|0.88|0.9|
||||||||
|**Group Delay Mean**|||||||
||-3.99|-4.12|-1.96|-4.57|-2.98|-2.43|
|**(ns)**|||||||
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|**Group Delay Variation**|||||||
||3|3|8|1|4|1|
|**(ns)**|||||||
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|**Noise Figure (dB)**|2.28|2.08|3.20|2.78|2.96|3.15|
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|**Polarization**|RHCP||||||
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||||||||
|**Impedance**|50 Ω||||||
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||**Mechanical**|
|---|---|
|||
|**Dimensions**|Ø60mm x 31.52mm|
|||
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|**Weight**|TBD|
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|**Material**|FR4|
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|**Cable**|RG-174|
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|**Connector**|SMA(M)|
|||
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||**Environmental**|
|**Operation Temperature**|-40 - +85°C|
|**Storage Temperature**|-40 - +85°C|
|||
|**RoHs & REACH Compliant**|Yes|
|||



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## Block Diagram 

## Return Loss 

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## VSWR 

## Efficiency 

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## Average Gain 

## Peak Gain 

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## **3.7** Axial Ratio |g 

**3.8** Axial Ratio vs Angle for Phi=0 of 

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3.9 Axial Ratio vs Angle for Phi=90<br>_<br>9<br>a ||<br>**----- End of picture text -----**<br>


**3.10** PCO _ 

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## PCV 

## Noise Figure (Low band) 

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## Noise Figure (High band) 

## Gain (Low band) 

12 

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## Gain (High band) 

## Out Of Band Rejection 

13 

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## Test Setup 

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## Patterns at 1176 MHz 

## XZ Plane 

## YZ Plane 

## XY Plane 

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## Patterns at 1227 MHz 

## XZ Plane 

## YZ Plane 

## XY Plane 

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## Patterns at 1545 MHz 

## XZ Plane 

## YZ Plane 

## XY Plane 

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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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## Bottom View 

## Side View 

## Top View 

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## **6.** Packaging ay,— 

1pc EAHP.125.01.0100D per PE Bag Dimensions - 135*130*140mm Weight - 75g 

24pcs EAHP.125.01.0100D per Carton Dimensions - 588*296*142mm Weight – 2Kg 

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142mm<br>293mm<br>**----- End of picture text -----**<br>


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Changelog for the datasheet **SPE-24-8-001 - EAHP.125.01.0100D** 

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

Date: 2024-01-02 Notes: Initial release. Author: Gary West 

## **Previous Revisions** 

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