Mitsubishi Electric's New "REESA" Small, Low-cost Array Antenna Achieves High-precision Beam Scanning

Mitsubishi Electric Corporation announced its development of the REESA (Rotational Element Electronically Scanned Array) antenna, a small, low-cost array antenna that achieves high-precision beam scanning by electronically rotating antenna elements individually. The REESA antenna is suitable for airport radar systems, mobile satellite communication systems and possible new applications such as microwave-based industrial heating and mounting on drones for long-distance data transmission. Commercialization of the product is targeted at 2020.

Key Features

1) Rotates antenna elements individually for precise phasing and beam scanning

• Controls phase by rotating circularly polarized antenna elements individually by motors
• Realizes high-precision beam scanning by controlling phase in approx. two-degree increments
• Smaller and less expensive than conventional mechanically driven parabola antennas and active electronically scanned arrays (AESAs)
  
  

2) Achieves high efficiency and low power consumption

• Uses a hollow waveguide for the antenna feed to achieve high efficiency of 85 percent in 12 GHz band
  
  

Development Background
Airport radars and mobile satellite communication systems conventionally use mechanically driven parabola antennas or AESAs, which electronically scan antenna beams with RF modules. The size and weight of the drive mechanism can be a problem in the case of parabolic antennas, while AESAs require expensive RF modules for each antenna element and achieve only limited accuracy in phasing required for high-precision beam scanning.