Automotive Applications

Operating up as high as 77 GHz antenna engineers regularly seek solutions to push their already great designs even further.  In today’s day and age, as frequencies increase well into the mm range, electronic packages are becoming increasingly smaller making for very tightly packed designs.  The close proximity of these components to one another is now bringing about electromagnetic interference (EMI) problems such as cross-talking and RF leakage, which can cause a once well operating design to fall well below FCC regulations.

Adaptive Cruise Control

Emerson & Cuming MWP has successfully contributed to several ACC designs, and products such as Eccosorb MMI-U, Eccosorb SF-U, Eccosorb BSR, Eccosorb MF-PP-120 and Eccosorb MCS-U have been proven to grant optimal operation in all conditions.

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Blind spot detection

Cavity resonances within the transmit & receive antenna area
Operating frequency : 24 GHz
Solution : Eccosorb BSR-2/SS6M offered in  kiss-cut sets

Cavity resonance at 24 GHz

• Cavity resonances at 24 GHz was causing interference with other internal components within the housing
• An inexpensive and durable solution was required to eliminate resonances
• An off the shelf microwave absorber was chosen after passing extensive environmental and RF testing.  It is supplied in a custom configuration with a self-adhesive backing.

Long range forward looking radar

Adaptive Cruise Control (ACC)

  • Pulsed Doppler, forward looking, 3-beam switched antenna
  • 77 GHz
  • 150 Meter Range (492’)
  • Eccosorb MIP absorber cast in place

RF leakage

• RF leakage at 12.5 GHz through connector pins was being transmitted to the wafer board below interfering with overall performance
• A viable, inexpensive and durable solution was required to eliminate any stray EMI
• A custom designed Mold-in-Place (MIP) material was used and cast directly into the connectors underside cavities around the pins to eliminate the problem

Short Range - High Resolution Radar

  • Multiple Sensors in bumpers, connected to central processor
  • 24 GHz
  • Distance to 20 meters 
  • Supports Parking Assist, Pre-Crash Detection, Stop & Go Driving, Back-Up Warning, Blind Spot Detection and Side Impact

Eccosorb GDS/SS6M absorber cut via water jet to print

Waveguide termination

• Operating at 76.5 GHz an extremely small precision waveguide assembly required a termination to reduce reflections
• Seen at right this small termination is sitting on a sheet of .25” x .25” graph paper
• Due to the high cost of machining such a small part, extensive R&D was done to eventually mold this part to shape