Flight Heritage since 2010

CubeSat Antenna System for 1U/3U


  • Suitable for 1U up to 3U CubeSats
  • Applications:
    • CubeSat TT&C
    • CubeSat RF Payloads
  • Linear or circular polarization
  • Deployment confirmation switch per antenna
  • Software safe/arm implementation
  • Dual redundant deployment system
  • Designed for combination with the ISIS TRXVU VHF/UHF Transceiver
  • Compatible with ISIS, Pumpkin, ClydeSpace and GomSpace products
  • Compliant to CubeSat standard
  • Design based on heritage from the Delfi-C3 satellite (2008)
  • Flight heritage since July 2010 on several missions

Option sheet

Availability: 8-12 weeks

  • Description
  • Product properties
  • Performance
  • Configurations
  • Qualification and acceptance testing
  • In the box


The ISIS CubeSat Antenna System 1/3U contains up to four tape spring antennas of up to 55 cm length. The deployment system relies on a thermal knife composed of one wire and two redundant heating elements per tape. RF phasing / BalUn circuitry ties the antennas together in the user-defined configuration.

Depending on the configuration, one or two radios in the CubeSat can connect to the antenna system by means of miniature RF connectors. The top face of the antenna system can accommodate a two solar cell solar panel and it can be customized for accommodating sensors or other systems to protrude to the exterior, e.g. camera apertures.

The antenna is compatible with any UHF and/or VHF radio system. It can be mounted on all ISIS CubeSat structures and Pumpkin rev C and rev D CubeSat structures. For custom made structures, which adhere to the CubeSat standard mechanical envelope, mounting should also be possible.

Product properties

  • Envelope stowed: (l x w x h) 98 x 98 x 7 [mm3] (supplied aluminium cover plate included)
  • 30 mm diameter centre through-hole for pass-through of payload or other interfaces
  • Mass: < 100g
  • Operational Temperature Range: -20 to 60°C
  • I2C Interface
  • Other protocol on demand
  • Miniature 9 pin OMNETICS connector


  • Rf input/output 1-4 SSMCX, female, 50 Ohm
  • Power Consumption:
    • Nominal: < 40 mW (3V3 model)
    • Nominal: < 60 mW (5V model)
    • During Deployment: 2W
  • Frequency Range: >10MHz useable bandwidth in frequency range specified
  • Max RF Power: 2W
  • Antenna Return Loss at resonance frequency > 10 db (VSWR < 2:1)
  • Deployment Duration: < 3 s above 15°C operating temperature
  • Antenna main beam gain:
    • UHF: 0 dBi
    • VHF: 0 dBi

Available Configurations

  • Supply Voltage 3.3V and 5V available on demand
  • ISIS Solar panel on top
  • ADCS sensor set (sun sensor/temp sensor)
  • Various RF antenna configurations

Qualification and Acceptance testing

Test QT AT
Mechanical Shock
Thermal Cycling
Thermal Vacuum

*QT is performed on the design/qualification model
*AT is performed on the unit to be shipped

• Antenna system
• RF harness
• Refurbishment kit for flight preparation
• Documentation: user manual, test and build reports