Satellite and Launch Platforms
Geosynchronous Satellite Interfaces
A geostationary satellite is built once and expected to work for fifteen years, 35,786 kilometres away, with no possibility of repair. Every RF interface in the transponder chain is chosen on that basis: for stability over a decade and a half, not for performance on day one.
Ka-Band
Q-Band
Phase-Stable
Semi-Rigid
15-Year Life
35,786 km
Orbit Altitude
15 yr
Design Life
DC–50 GHz
Coverage
Design Notes
Designing for Fifteen Years On Orbit
What changes when the mission is measured in decades rather than months.
01
Material Stability
Over fifteen years, slow processes dominate. Plating migration, dielectric creep and cold welding are irrelevant on a bench and decisive on a GEO transponder.
02
Thermal Cycling Count
A geostationary satellite passes through eclipse seasons year after year. The interface sees thousands of thermal cycles, and each one works the joint slightly.
03
Insertion Loss Budget
Transponder chains are long. Loss that seems negligible per interface accumulates through filters, switches and the output stage into real EIRP.
04
Phase Stability
Where the payload does beamforming or frequency reuse, relative phase between paths has to hold as the spacecraft heats and cools through each orbit.
05
Multipaction Margin
At power, in vacuum, RF breakdown is a real failure mode. Interface geometry and surface condition are part of the multipaction analysis, not separate from it.
Reference Data
Typical GEO Interface Requirements
Programme specifications govern. These are representative conditions for a GEO transponder chain.
| Parameter | Typical Requirement | Relevant Series | Note |
|---|---|---|---|
| Ku-band | 10.7–14.5 GHz | SMA, 2.92mm | Broadcast and data payloads |
| Ka-band | 17.7–30 GHz | 2.92mm, 2.4mm | High-throughput payloads |
| Q / V-band | 33–50 GHz | 2.4mm, 1.85mm | Feeder links |
| Outgassing | TML ≤ 1.0 %, CVCM ≤ 0.1 % | ASTM E595 screened | Condensation on cold surfaces |
| Phase stability | ±3 ppm/°C typical | Phase-stable series | Across the eclipse cycle |
| Design life | 15 years on orbit | Space-qualified series | No maintenance possible |
Our Role
What We Supply for GEO Payloads
01
Ka- and Q-Band Precision
2.92mm and 2.4mm interfaces that hold their match across the full allocation, with the repeatability a long transponder chain needs.
02
Phase-Stable Semi-Rigid
Formable and semi-rigid assemblies routed to your chassis, chosen for stability across the eclipse thermal cycle rather than for flexibility.
03
Documented Materials
Low-outgassing selections with certificates and lot traceability, formatted for the spacecraft data package.
Selected Products
Interfaces for Transponder Chains
Typical starting points for GEO payload interconnect. Send us the chain and the band and we will propose the configuration.
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0.086″ Semi-Rigid Low-Loss RF Coaxial Cable, 40 GHz Rated
$20.00 Add to cartQuick View -
2.4mm Female 4-Hole Flange Mount RF Connector – Field Replaceable, 8.64mm Hole Spacing, 0.23mm Pin Diameter
$22.00 Add to cartQuick View -
2.92mm Female 4-Hole Flange Mount RF Connector – Field Replaceable, 8.64mm Hole Spacing, 0.23mm Pin Diameter
$23.00 Add to cartQuick View -
2.92mm Female to 2.92mm Female RF Adapter
$22.00 Add to cartQuick View
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Market Overview
Satellite & Launch Platforms
The full picture: RF interconnects for LEO and GEO payloads, launch vehicles and ground terminals.
GEO Engineering Support
Specifying a Transponder Chain?
Send us the band plan, the power levels and the thermal environment, and our engineers will propose the interconnect.