Millimeter Wave Antenna Technology for Ultra-Low Profile Radar Module


Electronics - Radio Frequency
Electronics - Sensors & Instrumentation
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Millimetre wave (MMW) radars detect the distance, angle, and relative velocity of objects by irradiating them with millimetre wave and detecting their reflection. These radars offer certain key benefits –

  • Less affected by backlight, darkness, blizzards, dense fog, heavy rain, and other environmental factors.
  • Can be used for monitoring presence and movement of a person while preserving privacy.
  • Can be installed in positions not directly visible to human eye as millimetre wave penetrates obstacles such as glass and walls.

These radars are mainly used in the automotive sector but can also be used for various industrial and other applications such as on bicycles, outdoor surveillance, and disaster response. To facilitate easier installation and thus improve adoption in other sectors, the technology presented here describes a patented unique antennae design for ultra-low profile radar module.


The salient features of this technology are –

  • Combination of end-fire antennas with lens element to realize a highly efficient, small aperture, ultra-low profile millimetre wave module that can be installed anywhere.
  • Industry’s thinnest height of less than 12mm which is significantly lower profile than conventional systems. [80%-90%]
  • Easy installation with possibility of using narrow resin housing which are transparent to millimetre waves.
  • Ability to detect multiple obstacles in poor visibility conditions such as snowstorms, fog and dust.

The PoC of the system was done with the following specifications –

  • Detection Range: Vehicle/Person at 90m/35m.
  • FOV: Horizontal/Vertical of 120 deg/ 20 deg.
  • Frame Rate: 25 fps
  • Frequency: 76-81 GHZ with ability to select 60GHz based on application.

The specifications can be adjusted by changing the antennae design to suit different applications.


The lower profile of this radar allows it to be placed in locations where it was not possible to install a millimeter wave radar in the past. This enable its use in multiple new scenarios:

  • Construction equipment.
  • Outdoor surveillance / Intruder Detection.
  • Disaster relief operations when mounted on helmets, goggles, and other wearables.
  • Vehicles including cars, motorbikes, and bicycles.
  • Robotic applications including drones and cleaning robots.
  • Traffic surveillance systems.
  • Privacy protected areas like bathrooms, toilets, nursing homes and others.
  • Assisted mobility devices like wheelchairs.
  • Cabin monitoring for sensing vitals.

Market Trends & Opportunities

Millimetre wave radars are a key system for monitoring the surroundings in automotive ADAS (Advanced Driver Assistance System). The increased adoption has also been facilitated by reduction in cost of the radar IC and the use of single CMOS chip. The use of these radars in other sectors is expected to grow and for this, there is a need for ultra-low profile radars which are easier to install.

Unique Value Proposition

The ultra low profile of this radar, achieved with the unique antennae technology, allows a lot of flexibility in the choice of installation location. It also opens up more use cases for the millimetre wave radar.

When installed in a corner of the room or in a narrow space inside the wall , it allows privacy friendly monitoring of the condition of people. It can allow rescuers to sense and continue their operations in the dark and through smoke when installed on the helmets or goggles. In the healthcare sector, the ultra-low profile radar can be used for occupant monitoring and in acquiring contactless vital signs when installed inside the seat, under the rear-view mirror or the in the ceiling panel of the vehicle.

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