Antennas for Wireless Applications
Product Specification Robusta – SR4G031-PS-1.2 Page 1
1. Features
REFLECTOR Technology
Antenna for GNSS applications
GPS, GLONASS, Beidou and Galileo
Maintains high performance within device: DFI (Designed For Integration)
1.13mm diameter RF cable with IPEX MHF connector
Self-Adhesive mounted
Quick integration minimizes design cycle
High performance
Available in 2 standard cable lengths
2. Description
The Robusta antenna is intended for use with all positioning applications. It is a rigid
antenna with a cable that enables direct connection to the host device
(Plastic/Metal/PCB). This antenna can be placed against any material and will not
detune. It is designed for simple integration with plug and play simplicity. This
product specification shows the performance of the antenna covering the frequency
range: 1559 - 1609 MHz.
3. Applications
Trackers
Portable Devices
Drones
Wearable devices
Patent pending
Robusta GNSS Antenna
Part No. SR4G031 REFLECTOR Product Specification
Robusta
Part No. SR4G031
Antennas for Wireless Applications
Product Specification Robusta SR4G031-PS-1.2 Page 2
4. Part Number
Robusta: SR4G031-xxx
Note. -xxx refers to cable length option:
5. General Data
Part Number
Cable Length
SR4G031-100
100mm
SR4G031-150
150mm
Product name
Part Number
Frequency
Polarization
Operating temperature
Environmental condition test
Impedance with matching
Weight
Antenna Assembly type
Dimensions (Antenna)
Cable length
Connection
Robusta
Part No. SR4G031
Antennas for Wireless Applications
Product Specification Robusta SR4G031-PS-1.2 Page 3
6. RF Characteristics
The RF characteristics are shown with the antenna placed in three scenarios:
1) Placed on a metal surface (RF GND Plane)
2) In free space
3) Placed on a metal surface (Floating unconnected copper)
1559-1609MHz
Metal (RF GND)
Free space
Metal (Floating)
Peak gain
3.80dBi
2.45dBi
3.60dBi
Average gain
-3.00dBi
-2.45dBi
-3.00dBi
Average efficiency
>50%
>55%
>50%
Maximum return loss
<-11.0dB
<-13.0dB
<-13.0dB
Maximum VSWR
1.70:1
1.60 0:1
1.55:1
Robusta
Part No. SR4G031
Antennas for Wireless Applications
Product Specification Robusta SR4G031-PS-1.2 Page 4
7. RF Performance
7.1 Return Loss
7.2 VSWR
Robusta
Part No. SR4G031
Antennas for Wireless Applications
Product Specification Robusta SR4G031-PS-1.2 Page 5
7.3 Antenna Pattern Free Space
7.3.1 1559 MHz – 1609 MHz
3D pattern at 1575.4 MHz
Drag to rotate pattern and PCB by using Adobe Reader
(Click to Activate)
Robusta
Part No. SR4G031
Antennas for Wireless Applications
Product Specification Robusta SR4G031-PS-1.2 Page 6
8. Antenna Dimensions
8.1 Dimensions Antenna section
All dimensions in mm
8.2 Dimensions assembled
L
W
T
Length
Width
Thickness
23.0 ±0.2 (mm)
16.0 ±0.2 (mm)
1.6 (mm) nominal
SR4G031-100
SR4G031-150
L
L
108 ±2.0 (mm)
158 ±2.0 (mm)
2 Holes = 1mm ø (diameter)
Robusta
Part No. SR4G031
Antennas for Wireless Applications
Product Specification Robusta SR4G031-PS-1.2 Page 7
8.3 IPEX Connector
8.4 O-Ring Spacer
All dimensions in mm
I-PEX
Material
Copper Alloy
Plating
Ag
d1
d2
1.02 ±0.1
1.78 ±0.08
Robusta
Part No. SR4G031
Antennas for Wireless Applications
Product Specification Robusta SR4G031-PS-1.2 Page 8
8.5 Assembly
I-PEX Connector
1.13mm ø Cable
Antenna Section
O-ring Cable Spacers
Robusta
Part No. SR4G031
Antennas for Wireless Applications
Product Specification Robusta SR4G031-PS-1.2 Page 9
9. Electrical Interface
9.1 Host Interface
The host PCB requires the mating connector which is the IPEX MHF (UFL)
receptacle. The location should be close to the chip/modules pin for the RF. Any
feed from this receptacle should be maintained at 50Ω impedance.
9.2 Transmission Line
All transmission lines should be designed to have a characteristic impedance of 50Ω.
• The length of the transmission lines should be kept to a minimum.
• Any other parts of the RF system like transceivers, power amplifiers, etc, should also
be designed to have an impedance of 50 Ω.
Once the material for the PCB has been chosen (PCB thickness and dielectric constant),
a coplanar transmission line can easily be designed using any of the commercial
software packages for transmission line design. For the chosen PCB thickness, copper
thickness and substrate dielectric constant, the program will calculate the appropriate
transmission line width and gaps on either side of the feed.
A DC blocking capacitor should be placed in line to protect the RF front end.
10. Mechanical Adhesion
The antenna uses 3M 468MP adhesive on the reverse side of the antenna section. It
is designed for a one time fix to a clean smooth surface.
Antenna section reverse side
Robusta
Part No. SR4G031
Antennas for Wireless Applications
Product Specification Robusta SR4G031-PS-1.2 Page 10
11.0 Antenna Integration Guide
11.1 Applied Surface Material
The antenna can be placed on any material and will radiate effectively in the
direction away from the material. The performance will vary depending on the type of
material or surface used. This antenna is intended for use internally within a device
and this simply illustrates the versatility of the antenna.
The material behind the antenna is not critical, which enables it to be used in close
proximity in devices that are thin, and it can be placed on a variety of surfaces.
Examples:
Wall mounted devices.
Mounting onto metal chassis (e.g. light switch chassis)
Direct to host PCB
Devices installed in places where the material is not defined or where it may
be any of the above.
✔
✔
✔
Robusta
Part No. SR4G031
Antennas for Wireless Applications
Product Specification Robusta SR4G031-PS-1.2 Page 11
11.2 Placement
When placing the antenna within a device, the host PCB size is not a factor as with
PCB mounted antennas. However, the placement still needs to follow some basic
rules, as any antenna is sensitive to its environment.
The top side of the antenna must be clear of all obstructions that are electrically
conductive.
The location within the device should ideally be along any outer edge. The antenna
can be in direct contact with any surface.
If the antenna is placed on a PCB, it should be kept a minimum distance away from
any other board mounted component. This distance can be defined by projecting a
5° angle from the bottom of the antenna as shown below.
Robusta
Part No. SR4G031
Antennas for Wireless Applications
Product Specification Robusta SR4G031-PS-1.2 Page 12
11.3 Cable Routing
The cable has three spacers for clearance and to prevent it from being in direct
contact with any surface. The distance ‘d’ is defined by the O-ring (d=1.78mm).
Robusta
Part No. SR4G031
Antennas for Wireless Applications
Product Specification Robusta SR4G031-PS-1.2 Page 13
12. Hazardous Material Regulation Conformance
The antenna has been tested to conform to RoHS requirements. A certificate of
conformance is available from Antenova’s website.
13. Packaging
The antennas are stored in individual plastic (PE) bags. These are stored within a
second bag of 100 pieces.
Single antenna per bag 100 units per second bag (Labelled)
13.1 Optimal Storage Conditions
Temperature
-10ºC to 40ºC
Humidity
Less than 75% RH
Shelf life
18 Months
Storage place
Away from corrosive gas and direct sunlight
Packaging
Antennas should be stored in unopened sealed
manufacturer’s plastic packaging.
Robusta
Part No. SR4G031
Antennas for Wireless Applications
Product Specification Robusta SR4G031-PS-1.2 Page 14
13.2 Label Information
90.00m
m
Antennas for Wireless Applications
Product Specification Robusta – SR4G031-PS-1.2 released Aug 2017, updated Mar 2019 Page 15
Quality statements
Antenova’s products conform to REACH and RoHS legislation. For our statements
regarding these and other quality standards, please see www.antenova.com.
Antenna design, integration and test resources
Product designers – the details contained in this datasheet will help you to complete
your embedded antenna design. Please follow our technical advice carefully to
obtain optimum antenna performance.
It is our goal that every customer will create a high performing wireless product using
Antenova’s antennas. You will find a wealth of design resources, calculators and
case studies to aid your design at our website.
Antenova’s design laboratories are equipped with the latest antenna design tools
and test chambers. We provide antenna design, test and technical integration
services to help you complete your design and obtain certifications.
If you cannot find the antenna you require in our product range, please contact us to
discuss creating a bespoke antenna to meet your requirement exactly.
Contacts
Join our online antenna design community: ask.antenova.com
Order antenna samples and evaluation boards at: www.antenova.com
Request a quotation for antennas by volume: sales@antenova.com
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