Mitsubishi develops a new antenna made of injection-molded resin for high performance

Mitsubishi Resin Molded Slotted Waveguide Array Antenna

Mitsubishi Electric Corporation has brought out a slotted waveguide array antenna fabricated with injection-molded resin which has demonstrated to outperform conventional patch array antenna in side-lobe characteristics, cross-polarization characteristics and electric power efficiency.

The newly developed antenna is lighter in weight and has a lower cost. With a new antenna of Mitsubishi Electric, radar systems will be able to achieve enhanced observation range and accuracy and wireless communication systems to achieve greater communication capacity and speed.

The new antenna will now be deployed for various applications, such as weather, airport radar remote-sensing radar and satellite communications.

Reduced weight and low cost is one of the unique features of the new resin injection molded antenna. The resin is easily distorted by heat in comparison to metal and therefore resin-molding waveguide parts must be secured with screws, which require screw-holes that can degrade the antenna’s electric performance. This problem has been solved by Mitsubishi Electric by developing a proprietary “boss-iris structure,” which incorporates small, round “boss” protuberances for screw holes and an “iris” diaphragm waveguide to adjust electrical characteristics (part of the boss and the rib structure serve as the iris).

The antenna also achieves industry-leading performance due to its proprietary structures: “boss-iris structure” and “novel ridge structure” which is a fence meandering along the waveguide to control finely the radiation from the slots.

With these features, the new antenna’s injection-molded design maintains high performance as well as weighs 40 percent less and costs 90 percent less than conventional metallic versions.

Mitsubishi Electric has developed the antenna with the collaboration of Hiroshima Institute of Technology, and received support from the Japan Science and Technology Agency’s A-STEP program under a project entitled “Development of a novel resin ridge waveguide antenna with eminent low sidelobe.”

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