fuba FallstudienCase Studies:From task to solution.

fuba Scarabaeus Antenna



Antennas for GNSS (global navigation satellite system) are used for navigation, locating vehicles or other objects, for fleet management or in traffic guidance systems. GPS – as one of the available global satellite services – stands for Global Positioning System and uses a constellation of 24 to 32 satellites in Earth orbit. These transmit radio signals that enable GPS receivers to determine their current location, time and speed. AM/FM and GPS antennas are usually installed at different locations in the vehicle and wired separately. The space requirements and costs for integration are correspondingly high.



An existing AM/FM antenna had to be extended with GPS. The volume was allowed to be larger than usual: the entire technology was to fit into the same cone of a normal small roof antenna. The advantages of the intended solution are obvious: it should be possible to easily exchange the antennas, while a smaller volume at the same time results in lower antenna costs.


Another challenge: for a customer, an SDARS antenna was to be mounted recessed in the car roof; however, existing patch antennas do not work with sufficient performance from a small cut-out.

Scarabaeus von fuba



With the Scarabaeus, a metal frame antenna was developed that is fed and adjusted via several feet. Our Scarabaeus design results in a significantly smaller construction volume in a roof antenna.


Without changing the surface of the vehicle, the antenna combination is fully embedded in a metal cavity and covered by a thick dielectric part of the roof.

Scarabaeus-Antenne von fuba



GPS can now be implemented in an antenna that previously only accommodated AM/FM; the other functions (telephone antenna, AM/FM antenna, SDARS = Satellite Digital Audio Radio Services) could be integrated into the same volume with our Scarabaeus.


The system offers the same or even better reception performance than existing patch antennas. Measurement results show a high efficiency and a large bandwidth, which clearly exceeds the necessary bandwidth for SDARS and GPS. The Scarabaeus is easy to produce and the reception performance can be reproduced to a high degree. In addition to GPS, other GNSS bands can be integrated on request. Various patents exist for different designs worldwide.


  • Simple production and high reproducibility
  • Space requirement is much smaller than with two individual antennas
  • Combination is completely embedded in the metal roof of a car
  • Covered by the surface of the vehicle (invisible)
  • Precise correlation between simulation and measurement
  • Low losses
  • Radiation pattern is tailored to the reception of satellite signals
  • Very low mutual coupling
Scarabaeus-Antenne von fuba

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