S-Band Quadrifilar Helix Antenna
S-Band Quadrifilar Helix Antenna

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  • Payload and Telemetry Downlink
  • Data rates up to 10 Mbps
  • Cardioid gain pattern
  • Right or left hand circular polarization
  • Constant power flux density at the earth’s surface
  • Delivery : 6 months for quantities of 1 or 2
Export Classification: EAR
Total Price:
Initial Online Deposit: $4,800

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The Surrey S-Band Quadrifilar Helix antenna provides a cost-effective downlink antenna solution for a wide range of LEO missions. It is capable of supporting high data rates and RF power, and the design provides a low physical footprint with an optimal gain pattern.

Surrey's Quadrifilar Antenna can downlink Payload data at data rates up to 10Mbps Data Rate at S-Band frequency and can also be used to downlink Telemetry data.

This antenna produces a cardioid pattern with a nadir null to ensure constant power flux density at the Earth’s surface throughout the duration of a pass.
  • Mass : < 500g
  • Power : Up to 10W RF power
  • Dimensions : 100 x 100 x 389 mm
  • Design Lifetime (LEO) : 7.5 Years
  • Operating Temperature Range: -20ºC  to +50ºC
  • Non-Operating Temperature Range: -30ºC to +60ºC
  • Data Interfaces: 50 Ohm RF interface (SMA female)
Baseline Deliverables
All of our units come with the following as standard, unless stated otherwise:
  • Functional performance testing according to Surrey test procedures
  • Random Vibration testing to NASA GEVS acceptance levels to verify workmanship – with pre- and post-vibration functional performance testing
  • Thermal cycling (in ambient pressure) over the stated operational temperature range - undertaking 3 thermal cycles with functional performance testing before the start of thermal cycling and then at the temperature extremes on the final cycle.
  • Documentation
    - Interface Control Documentation
    - User Manual
    - Test Results
  • No customer reviews are included in the baseline price
Baseline Payment Schedule
  • Initial Deposit Payment : 5% (initial deposit required to secure your order)
  • Order Acceptance : 35% 
  • Test Readiness Review : 30%
  • Delivery Readiness Review : 30%
  • Shipping and any applicable taxes will be advised on acceptance of your order.

Manufacturing Standards
  • Surrey is compliant with ISO9000:2000 requirements.
  • Surrey is compliant with the requirements of the following standard processes: 
    - NASA-STD-8739.3: Manual Soldering
    - NASA-STD-8739.2: Surface-Mount Technology
    - IPC-6012: Qualification and performance Specifications for space flight PWBs.
Storage and Handling
  • Whenever possible, all Surrey flight hardware units must be kept in a clean environment, e.g. ISO class 8 (100,000) clean room, with a temperature range between 19ºC and 25ºC and a relative humidity range between 40% and 60%.
  • Surrey recommends that customer personnel who will handle Surrey hardware have received clean room behavior training, including dress code, module handling, use of appropriate tools and anti-static procedures, and have read and understood all Surrey deliverable documentation
Data Sheet
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