Types of NTN Devices: Smartphones, VSATs, ESIMs & IoT Devices Explained
Introduction NTN Devices
Non-Terrestrial Networks (NTN) are transforming the future of wireless communication by extending cellular connectivity beyond traditional terrestrial mobile networks. Unlike conventional cellular networks that depend on ground-based base stations, NTN uses satellites and high-altitude platforms (HAPS) to provide connectivity across remote, rural, maritime, aerial, and underserved geographical regions.NTN Devices
With the evolution of 5G and 5G-Advanced technologies, different types of devices are being developed to communicate through satellite-based networks.
These devices include:NTN Devices
5G NR-enabled smartphones
Very Small Aperture Terminals (VSATs)
Earth Stations in Motion (ESIMs)
Internet of Things (IoT) devices
LTE-M and NB-IoT-enabled satellite devices
However, not all NTN devices have the same radio-frequency (RF) capabilities. Their transmit power, antenna gain, antenna configuration, receiver noise figure, polarization, and operating frequency can differ significantly.NTN Devices
For example, a typical 5G NR smartphone operates with a maximum transmit power of approximately 23 dBm, whereas a VSAT terminal may support 33 dBm transmit power and use a high-gain directional antenna.
These differences directly influence satellite link budgets, coverage, data rates, power consumption, and overall communication performance.
In this article, we will explore different types of NTN devices, their technical characteristics, RF capabilities, and how they support satellite-based 5G and IoT communication.
Table of Contents
What Are NTN Devices?
Types of NTN Devices
5G NR Smartphones in NTN
VSAT Terminals in NTN
Earth Stations in Motion (ESIMs)
IoT Devices in NTN
RF Characteristics of Different NTN Devices
Transmit Power and Antenna Gain Comparison
Antenna Polarization and Signal Loss
Noise Figure and Receiver Sensitivity
Frequency Selection for NTN Devices
Key Differences Between Smartphones, VSATs and IoT Devices
Applications of Different NTN Devices
Challenges in NTN Device Design
Future of NTN Devices in 5G-Advanced and 6G
Skills Required to Work on NTN Technologies
Frequently Asked Questions
Conclusion
What Are NTN Devices?
NTN devices are user equipment (UE) or communication terminals designed to connect with non-terrestrial network infrastructure through satellites or airborne communication platforms.
Traditional terrestrial networks use cellular base stations installed on the ground. However, NTN devices communicate through satellite-based radio access infrastructure, allowing wireless connectivity even in areas where terrestrial cellular coverage is unavailable.
Depending on the application, NTN devices can use different wireless technologies, including:
5G New Radio (NR)
LTE-M
NB-IoT
Satellite-specific communication technologies
The choice of technology depends on the device's hardware capabilities, cost, power consumption, antenna design, available bandwidth, and satellite link characteristics.
For example:
Smartphones support broadband satellite connectivity and direct-to-device communication.
VSAT terminals provide high-gain satellite connectivity for enterprise and broadband applications.
ESIM terminals support satellite connectivity while moving on ships, aircraft, and vehicles.
IoT devices enable low-data-rate communication for sensors, tracking systems, and remote monitoring.
The primary objective of NTN devices is to extend reliable communication services beyond the limitations of conventional terrestrial networks.
Types of NTN Devices
NTN supports different categories of communication devices based on their capabilities, cost, power consumption, and intended applications.
The major categories are:
2.1 Smartphones
Smartphones are handheld mobile devices that can communicate with satellites through supported NTN technologies.
They are particularly important for direct-to-device (D2D) satellite connectivity, emergency communication, messaging, and potentially broadband services.
2.2 VSAT Terminals
VSAT terminals use high-gain directional antennas to establish satellite communication links.
They are commonly used for enterprise connectivity, broadband access, maritime communication, aviation, and remote network infrastructure.
2.3 Earth Stations in Motion (ESIMs)
ESIMs are satellite terminals installed on moving platforms such as:
Ships
Aircraft
Road vehicles
They allow continuous satellite connectivity while the platform is moving.
In traditional satellite communication terminology, an Earth Station is a satellite terminal equipped with an antenna and associated communication equipment. An Earth Station in Motion is an Earth Station capable of operating while moving.
ESIMs are also commonly referred to as mobile VSATs.
2.4 IoT Devices
IoT devices are designed for low-power, low-cost, and low-data-rate communication.
In NTN environments, they can use technologies such as LTE-M and NB-IoT to connect sensors and machines through satellite infrastructure.
Examples include agricultural sensors, asset trackers, environmental monitoring systems, and industrial equipment.
5G NR Smartphones in NTN
Smartphones represent one of the most important device categories in the development of 5G NTN.
Traditional smartphones communicate with terrestrial base stations using cellular radio interfaces. However, NTN-enabled smartphones can communicate through satellite-based network infrastructure when terrestrial coverage is unavailable.
3GPP has introduced support for NR-based satellite access, enabling compatible user equipment to operate in NTN environments.
Key Characteristics of NTN Smartphones
A representative 5G NR smartphone configuration has the following characteristics:
Maximum transmit power: Approximately 23 dBm.
Transmit power class: Power Class 3.
Antenna type: Omnidirectional or implementation-dependent antenna configuration.
Antenna gain: Approximately 0 dBi in representative reference assumptions.
Noise figure: Approximately 9 dB.
Polarization: Typically linear polarization.
The omnidirectional antenna allows smartphones to communicate without requiring precise mechanical alignment toward a satellite.
However, this design introduces certain challenges.
Unlike VSAT terminals, smartphones have limited antenna gain and transmit power. They also operate with strict battery, size, weight, and thermal constraints.
Therefore, establishing reliable satellite connectivity using a handheld smartphone requires careful RF link-budget design, satellite beam management, and efficient radio-resource utilization.
Applications of NTN Smartphones
Emergency messaging outside cellular coverage.
Direct-to-device satellite communication.
Remote-area connectivity.
Disaster recovery communication.
Safety and location-based services.
It is important to understand that satellite connectivity is not automatically available on every 5G smartphone. Device hardware, supported bands, modem capabilities, operator services, and satellite-network compatibility all matter.
VSAT Terminals in NTN
A Very Small Aperture Terminal (VSAT) is a satellite communication terminal that uses a relatively small dish antenna to establish communication with satellites.
VSAT terminals are widely used in satellite broadband, enterprise networking, remote communication, maritime connectivity, and industrial applications.
Compared with smartphones, VSAT terminals can support considerably higher antenna gain and transmit power.
Key Characteristics of VSAT Terminals
A representative VSAT configuration may have the following RF characteristics:
Transmit power: Approximately 33 dBm (2 W).
Transmit antenna gain: Approximately 43.2 dBi.
Receive antenna gain: Approximately 39.7 dBi.
Noise figure: Approximately 1.2 dB.
Antenna type: High-gain directional dish antenna.
Polarization: Circular polarization.
These are representative values from 3GPP NTN terminal assumptions, not universal specifications for every commercial VSAT.
Why Does VSAT Use a High-Gain Antenna?
Satellite communication involves large propagation distances between the satellite and the Earth-based terminal.
During signal transmission, free-space propagation introduces significant path loss.
A high-gain directional antenna concentrates radio-frequency energy in a specific direction instead of distributing it uniformly across multiple directions.
This provides several advantages:
Improved uplink signal strength.
Better reception of weak satellite signals.
Improved link budget.
Support for higher-frequency satellite communication.
More efficient use of transmit power.
As a result, VSAT terminals can operate effectively in frequency bands where handheld devices may face greater link-budget limitations.
Applications of VSAT Terminals
Enterprise satellite broadband.
Remote office connectivity.
Banking and financial networks.
Oil and gas infrastructure.
Defence and government communication.
Maritime and aviation communication.
Earth Stations in Motion (ESIMs)
Earth Stations in Motion (ESIMs) are satellite communication terminals designed to operate while installed on moving platforms.
A traditional VSAT terminal is generally installed at a fixed location. However, an ESIM can maintain satellite communication while its host platform is moving.
ESIM technology is particularly important for satellite connectivity in transportation and mobility applications.
Types of ESIMs
Maritime ESIM
Maritime ESIMs are installed on ships, vessels, and offshore platforms.
They support satellite broadband, vessel tracking, crew communication, and operational connectivity.
Aeronautical ESIM
Aeronautical ESIMs are installed on aircraft and enable in-flight connectivity.
They support passenger internet services, airline operations, and aircraft communication systems.
Land-Mobile ESIM
Land-mobile ESIMs are installed on moving vehicles such as buses, emergency-response vehicles, and specialised transportation platforms.
They provide satellite connectivity in areas without reliable terrestrial coverage.
Technical Challenges of ESIMs
ESIMs must maintain a stable satellite link despite:
Platform movement.
Changing antenna orientation.
Satellite handovers.
Doppler frequency shifts.
Variable propagation conditions.
Regulatory and interference constraints.
To overcome these challenges, ESIM terminals may use electronically steered antennas, tracking systems, and advanced beam-management techniques.
IoT Devices in NTN
Internet of Things (IoT) devices are another important category of NTN user equipment.
Unlike smartphones and VSAT terminals, IoT devices are generally designed to transmit small amounts of data while consuming minimum electrical power.
Many IoT applications operate in locations where terrestrial cellular networks are unavailable.
Examples include:
Agricultural fields.
Forest monitoring systems.
Remote pipelines.
Industrial facilities.
Offshore infrastructure.
Environmental monitoring stations.
LTE-M and NB-IoT for NTN
3GPP has introduced satellite access support for IoT technologies, particularly LTE-M and NB-IoT.
LTE-M (LTE Cat-M1)
LTE-M is designed for low-power wide-area IoT connectivity. It supports applications requiring moderate data rates, mobility support, and efficient power consumption.
NB-IoT (Narrowband Internet of Things)
NB-IoT is designed for applications requiring low data rates, extended coverage, and low device complexity.
Its narrow bandwidth and power-efficient operation make it suitable for several satellite-connected IoT applications.
Transmit Power of NTN IoT Devices
Depending on the device category and implementation, IoT devices may support different transmit power levels.
Representative values include:
23 dBm: Standard higher-power UE configuration.
20 dBm: Lower-power UE configuration.
14 dBm: Reduced-power configuration in supported specifications.
Lower transmit power can help reduce energy consumption, but it also reduces the available uplink link budget.
Therefore, the device's transmit power, antenna performance, satellite coverage, and application requirements must be considered together.
RF Characteristics of Different NTN Devices
The RF characteristics of NTN devices determine how effectively they communicate with satellite-based network infrastructure.
The most important parameters include:
Maximum transmit power.
Antenna type.
Transmit antenna gain.
Receive antenna gain.
Receiver noise figure.
Antenna polarization.
Operating frequency.
These parameters are essential when designing and analysing NTN radio links.
Representative NTN Device RF Comparison
The following table is based on representative terminal assumptions described in 3GPP TR 38.811.
RF Parameter | VSAT | Smartphone / Handheld |
Transmit Power | 33 dBm | 23 dBm |
Antenna Type | Directional dish | Omnidirectional |
TX Antenna Gain | 43.2 dBi | 0 dBi |
RX Antenna Gain | 39.7 dBi | 0 dBi |
Noise Figure | 1.2 dB | 9 dB |
Polarization | Circular | Linear |
Typical Application | Broadband | Mobile connectivity |
IoT devices can have different configurations depending on whether they use LTE-M, NB-IoT, or another supported radio technology.
Important Technical Note: The table represents reference assumptions, not universal specifications for all NTN products. Real-world device parameters vary with frequency band, antenna design, hardware implementation, and 3GPP release.
Transmit Power and Antenna Gain Comparison
Transmit power and antenna gain are two important parameters in satellite communication link-budget calculations.
Understanding Transmit Power
Transmit power represents the RF power generated by the device and delivered to its antenna under the specified measurement conditions.
It is commonly represented in dBm.
For example:
Transmit Power | Equivalent Power |
14 dBm | Approximately 25 mW |
20 dBm | 100 mW |
23 dBm | Approximately 200 mW |
33 dBm | Approximately 2 W |
A VSAT operating at 33 dBm has significantly higher transmit power than a representative smartphone operating at 23 dBm.
However, transmit power alone does not determine the overall radiated signal strength.
Understanding Antenna Gain
Antenna gain represents the ability of an antenna to concentrate transmitted or received electromagnetic energy in a particular direction.
It is generally measured in dBi.
A smartphone uses an approximately omnidirectional antenna, whereas a VSAT uses a directional high-gain antenna.
Consequently, the VSAT can achieve substantially higher effective isotropic radiated power (EIRP).
The simplified EIRP relationship is:
EIRP = P_TX + G_TX - L
Where:
P_TX = Transmit power in dBm.
G_TX = Transmit antenna gain in dBi.
L = Feeder and other applicable system losses in dB.
For example, using the representative VSAT parameters:
EIRP = 33 + 43.2 = 76.2 dBm
This is before accounting for feeder and other system losses.
The example illustrates why high-gain VSAT antennas can support satellite links over long distances.
Antenna Polarization and Signal Loss
Antenna polarization describes the orientation of the electric field of an electromagnetic wave.
It plays an important role in satellite communication because the transmitting and receiving antennas must have compatible polarization characteristics.
Two commonly used polarization types are:
Linear Polarization
Vertical polarization.
Horizontal polarization.
Slant polarization.
Circular Polarization
Right-Hand Circular Polarization (RHCP).
Left-Hand Circular Polarization (LHCP).
Polarization Mismatch in NTN
In representative NTN terminal assumptions, smartphones and IoT devices commonly use linear polarization, while satellite platforms and VSAT systems may use circular polarization.
When the transmitting and receiving antennas have mismatched polarization, the received signal power decreases.
For an ideal linear-to-circular polarization mismatch, approximately 3 dB of polarization loss can occur.
This means that the received signal power can be reduced by approximately half compared with an ideally polarization-matched link.
This loss must be considered during NTN link-budget calculations.
Noise Figure and Receiver Sensitivity
Noise figure (NF) represents the degradation in signal-to-noise ratio introduced by a receiver.
It is measured in decibels (dB).
A lower noise figure generally indicates better receiver performance because the receiver adds less noise to the incoming signal.
Representative NTN assumptions include:
VSAT: Approximately 1.2 dB.
Smartphone: Approximately 9 dB.
The difference is important because VSAT receivers can use specialised low-noise RF front ends, while smartphones must balance receiver performance against size, power consumption, and cost.
Why Is Noise Figure Important?
In satellite communication, received signals may be extremely weak because of the long distance between the Earth and the satellite.
A receiver with a lower noise figure can improve the overall receiver noise performance.
This can contribute to:
Better receiver sensitivity.
Improved link margin.
More reliable communication.
Improved performance under weak signal conditions.
However, receiver sensitivity also depends on channel bandwidth, modulation, coding, implementation losses, and required signal-to-noise ratio.
Frequency Selection for NTN Devices
Operating frequency is another critical factor in NTN system design.
The selection of frequency depends on the device's transmit power, antenna gain, propagation conditions, available spectrum, and application requirements.
Why Are Lower Frequencies Suitable for Low-Power IoT Devices?
Lower frequencies generally experience lower free-space path loss than higher frequencies over the same propagation distance, assuming comparable antenna reference conditions.
This makes lower-frequency operation attractive for low-power IoT devices with limited transmit power and small antennas.
For example, an NB-IoT sensor operating with limited transmit power may benefit from a lower-frequency satellite link.
Why Can VSATs Operate at Higher Frequencies?
VSAT terminals use high-gain directional antennas that help compensate for large propagation losses.
Therefore, they can support higher-frequency satellite communication systems, including Ku-band and Ka-band applications, subject to the relevant system design and regulatory conditions.
Frequency Selection Comparison
Parameter | Smartphone / IoT | VSAT |
Antenna | Compact | High-gain |
Transmit Power | Limited | Higher |
Frequency Consideration | Lower-frequency links can be beneficial | Higher-frequency links are feasible |
Main Constraint | Device power and antenna size | Link budget, pointing and weather conditions |
Typical Applications | Direct-to-device, IoT | Broadband, enterprise connectivity |
It is important to note that frequency selection is not determined by device type alone. Satellite orbit, antenna gain, atmospheric attenuation, rain fading, spectrum availability, and regulatory requirements also influence the final design.
Key Differences Between Smartphones, VSATs and IoT Devices
Although all these devices can participate in NTN communication, their design objectives are different.
Feature | Smartphone | VSAT | IoT Device |
Primary Purpose | Mobile communication | Satellite broadband | Sensor communication |
Cost | Medium to high | Medium to high | Low |
Data Requirement | Medium to high | High | Low |
Transmit Power | Typically 23 dBm | Representative 33 dBm | 14–23 dBm, depending on configuration |
Antenna | Omnidirectional | High-gain directional | Compact antenna |
Power Consumption | Battery-powered | External power commonly used | Very low-power operation |
Technology | 5G NR NTN | NR-NTN / satellite systems | LTE-M / NB-IoT NTN |
Mobility | Handheld | Fixed or mobile | Application-dependent |
Which NTN Device Is Suitable for Which Application?
Smartphones: Best suited for personal communication, emergency services, and direct-to-device connectivity.
VSATs: Suitable for high-throughput enterprise, maritime, and aviation communication.
ESIMs: Suitable for satellite connectivity while moving.
IoT devices: Suitable for remote monitoring, tracking, and low-data-rate applications.
Applications of Different NTN Devices
NTN devices are enabling new communication possibilities across several industries.
13.1 Emergency Communication
Smartphones can provide emergency messaging and connectivity in locations without terrestrial mobile coverage.
13.2 Enterprise Connectivity
VSAT terminals provide broadband connectivity to remote offices, mining locations, and industrial infrastructure.
13.3 Aviation and Maritime
ESIM technology enables internet access and operational connectivity on aircraft and ships.
13.4 Smart Agriculture
Satellite-connected IoT sensors can monitor soil moisture, weather conditions, and agricultural equipment.
13.5 Environmental Monitoring
IoT devices can transmit environmental measurements from forests, oceans, and remote geographical regions.
Challenges in NTN Device Design
Developing devices for satellite communication is more challenging than designing conventional terrestrial cellular devices.
Some important technical challenges include:
14.1 High Propagation Path Loss
Satellite communication involves long propagation distances. This introduces substantial free-space path loss, particularly at higher frequencies.
14.2 Limited Transmit Power
Smartphones and IoT devices have limited transmit power because of battery capacity, hardware size, and thermal constraints.
14.3 Doppler Frequency Shift
Moving satellites introduce Doppler frequency shifts that can affect frequency synchronization and signal reception.
14.4 Timing Synchronization
The large propagation delay between a satellite and a terrestrial device creates challenges for uplink timing and radio-resource management.
14.5 Antenna Limitations
Smartphones and compact IoT devices cannot use the large directional antennas commonly found in VSAT terminals.
14.6 Polarization Mismatch
Differences in antenna polarization can introduce additional signal losses and must be included in the RF link budget.
14.7 Mobility and Satellite Tracking
ESIMs and other mobile terminals must maintain reliable communication as their location and orientation change.
These challenges require improvements in RF design, modem architecture, antenna technology, signal processing, and 3GPP protocol procedures.
Future of NTN Devices in 5G-Advanced and 6G
NTN technology is expected to become an important part of future mobile communication infrastructure.
As 5G-Advanced and 6G evolve, NTN devices will support more advanced connectivity capabilities.
15.1 Direct-to-Device Satellite Connectivity
Future smartphones will increasingly support satellite-based communication without requiring dedicated external satellite terminals.
15.2 Advanced Satellite IoT
LTE-M and NB-IoT satellite connectivity can expand to support more remote monitoring and industrial applications.
15.3 Advanced Antenna Technologies
Phased-array antennas and electronically steered antenna systems will improve satellite tracking and beam alignment.
15.4 Multi-Connectivity
Future devices may use terrestrial and non-terrestrial networks together to improve connectivity, coverage, and service continuity.
15.5 Higher-Frequency Satellite Communication
Advanced VSAT terminals and antenna technologies will support higher-frequency satellite links where the required link budget and propagation conditions can be achieved.
15.6 6G Integrated Terrestrial and Non-Terrestrial Networks
6G research aims to integrate terrestrial networks, satellites, and airborne platforms into a more unified communication ecosystem.
This will create new opportunities for telecom engineers working in satellite communication, RF engineering, protocol development, network testing, and system integration.
Skills Required to Work on NTN Technologies
The development and deployment of NTN systems require engineers with expertise in wireless communication, satellite networking, RF engineering, and 5G protocol technologies.
Some important technical skills include:
Skill | Importance in NTN |
5G NR Architecture | Understanding the 5G radio interface and network architecture |
NR-NTN Protocols | Understanding satellite-specific NR procedures |
LTE-M and NB-IoT | Working with satellite IoT technologies |
RF Link Budget | Analysing transmit power, antenna gain, and propagation loss |
Satellite Communication | Understanding GEO, MEO, and LEO systems |
RRC and NAS | Analysing control-plane signalling |
PHY and MAC | Understanding radio transmission and scheduling |
Protocol Testing | Testing and troubleshooting NTN communication |
RF Optimization | Improving link performance and coverage |
For telecom professionals, learning 5G NR, NTN architecture, RF fundamentals, and protocol testing can provide a strong technical foundation for emerging satellite-network opportunities.
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Frequently Asked Questions (FAQs)
Q1. What are NTN devices?
NTN devices are communication terminals that connect with non-terrestrial network infrastructure through satellites or airborne platforms. Examples include smartphones, VSAT terminals, ESIMs, and IoT devices.
Q2. What are the main types of NTN devices?
The main types include 5G NR smartphones, VSAT terminals, Earth Stations in Motion (ESIMs), and satellite-enabled IoT devices.
Q3. What is the difference between a VSAT and an ESIM?
A VSAT is a satellite communication terminal, generally used at a fixed location. An ESIM is a mobile satellite terminal designed to operate on moving platforms such as ships, aircraft, and vehicles.
Q4. What is the typical transmit power of a 5G NTN smartphone?
A representative 5G NR NTN smartphone uses Power Class 3, corresponding to approximately 23 dBm maximum transmit power.
Q5. What is the typical transmit power of a VSAT terminal?
A representative VSAT terminal configuration can use approximately 33 dBm (2 W) transmit power, although actual values vary with hardware and system design.
Q6. Why do VSAT terminals use high-gain antennas?
VSAT terminals use high-gain directional antennas to improve the satellite link budget, increase effective radiated power, and improve reception of weak satellite signals.
Q7. Which technologies are used for NTN IoT communication?
LTE-M and NB-IoT are important 3GPP technologies supporting satellite-based IoT communication.
Q8. Why is lower-frequency communication suitable for IoT devices?
Lower frequencies generally experience lower free-space path loss over the same distance. This can help low-power IoT devices establish more reliable satellite links.
Q9. What is polarization mismatch in NTN?
Polarization mismatch occurs when transmitting and receiving antennas have different polarization characteristics. Linear-to-circular polarization mismatch can introduce approximately 3 dB of signal loss under ideal conditions.
Q10. What is the role of NTN devices in 6G?
NTN devices will help integrate satellite, terrestrial, and airborne communication systems, enabling wider coverage and connectivity for smartphones, IoT devices, vehicles, aircraft, and industrial applications.
Conclusion
NTN devices are a fundamental component of the emerging satellite-based communication ecosystem.
From 5G smartphones and high-gain VSAT terminals to mobile ESIMs and low-power IoT sensors, each device category has different RF characteristics and operational requirements.
Smartphones focus on compact design and convenient connectivity, VSAT terminals provide high antenna gain and stronger link-budget performance, ESIMs enable communication during movement, and IoT devices support low-power communication for remote monitoring and industrial applications.
Understanding transmit power, antenna gain, noise figure, polarization, and frequency selection is essential for designing and analysing reliable NTN communication systems.
As 5G-Advanced and 6G technologies continue to evolve, engineers with expertise in NTN architecture, RF engineering, satellite communication, and 5G protocol testing will play an important role in the future of telecommunications.
The future of mobile communication will not be limited to terrestrial networks. Satellites and terrestrial infrastructure will work together to create a truly connected world.
References and Further Reading
3GPP TR 38.811 – Study on New Radio (NR) to Support Non-Terrestrial Networks.
3GPP TS 38.101-5 – NR User Equipment Radio Transmission and Reception for Satellite Access.
3GPP TR 38.863 – Solutions for NR to Support Non-Terrestrial Networks.
3GPP TS 36.521-4 – LTE User Equipment Conformance Testing for Satellite Access.
IEEE – Technical Publications on 5G Non-Terrestrial Networks.
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