# How Satellites Handle Super Fast User Data Using Shared Antennas

> This patent describes a satellite system boosting data capacity by having satellites receive high-speed user data, relay it via crosslinks to other satellites, and then send it to ground stations, often using a single antenna for both user and ground connections.

- **Patent:** US 8135338
- **Original title:** Satellite system with enhanced payload capacity
- **Owner:** Space Systems Loral
- **Granted:** 2012
- **Status:** Active
- **Times cited:** 25
- **Field:** telecommunications, aerospace, software

## What it does

The patent describes a method for a satellite system to handle a lot of data quickly. A first satellite receives data from a user at a high speed, specifically greater than 30 Mbps (Claim 1). This receiving antenna is special because it's also designed to work at the same frequency as the "feeder link" (the connection to a ground station) and can even complete a second feeder link itself (Claim 1). The data then travels from this first satellite to a second satellite using a "crosslink" (satellite-to-satellite connection), and finally, the second satellite sends the data down to a "terrestrial gateway" (a ground station) via a "feeder link" (Claim 1). For example, an unmanned aerial vehicle (UAV) could send high-speed data to a satellite, which then relays it through the satellite network to a ground station connected to the internet.

## What it does NOT cover

- Satellite systems where the user-facing antenna cannot also operate at the feeder link frequency band (Claim 1).
- Systems where the data rate from the user is consistently 30 Mbps or less (Claim 1).
- Satellite systems that do not use crosslinks to forward data between satellites (Claim 1).
- Systems where the feeder link does not connect to a terrestrial gateway coupled to a terrestrial data network (Claim 1).
- Systems where the user terminal requires a transmitter output power of 50 watts or more, or an aperture size of 1.3 meters or more (Claim 12).

## The clever bit

The novelty lies in configuring the satellite's user-facing antenna to also operate at the feeder link frequency band, and potentially even complete a feeder link itself (Claim 1). This dual-use capability allows for more efficient use of satellite hardware and spectrum, enhancing overall payload capacity by streamlining how data is received and then forwarded to ground stations.

## Real-world examples

1. Starlink (SpaceX)
2. OneWeb
3. Project Kuiper (Amazon)
4. Viasat (for high-throughput satellites)
5. Government and military satellite communication networks

## Why it matters

This patent addresses the challenge of providing high-speed internet and data services from space, especially to remote or mobile users like UAVs or those in high-latitude regions. By efficiently handling high data rates and using inter-satellite links, it helps overcome limitations of traditional satellite communication, which often require satellites to be in direct view of a ground station to offload data. This approach allows for more flexible and robust global coverage.

## Frequently asked questions

### What does How Satellites Handle Super Fast User Data Using Shared Antennas cover?

This patent describes a satellite system boosting data capacity by having satellites receive high-speed user data, relay it via crosslinks to other satellites, and then send it to ground stations, often using a single antenna for both user and ground connections.

### Who owns patent US 8135338?

Space Systems Loral owns this patent, granted in 2012.

### When does this patent expire?

This patent is expected to expire on December 24, 2028, when the invention enters the public domain.

### What is patent US 8135338 cited by?

This patent has been cited by 25 later patents that build on its ideas.

### What problem does this patent solve?

This patent addresses the challenge of providing high-speed internet and data services from space, especially to remote or mobile users like UAVs or those in high-latitude regions. By efficiently handling high data rates and using inter-satellite links, it helps overcome limitations of traditional satellite communication, which often require satellites to be in direct view of a ground station to offload data. This approach allows for more flexible and robust global coverage.

### What does this patent NOT cover?

Satellite systems where the user-facing antenna cannot also operate at the feeder link frequency band (Claim 1).

**Full plain-English explainer:** https://patentbrief.org/patent/us/8135338/satellite-system-with-enhanced-payload-capacity

**Original patent:** https://patents.google.com/patent/US8135338

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_Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._