Electronic safety systems are rapidly becoming major parts of modern automotive vehicles, steering toward a future of roadways filled with autonomous vehicles. Advanced driver-assistance systems (ADAS) based on radar and electronic communications circuits are promising safer future roadways. Crafting these systems requires high-frequency electronic components, such as RF/microwave printed-circuit-board (PCB) antennas for automotive radar sensors and for various forms of communications between vehicles. In turn, fabricating effective components requires suitable circuit materials. Increased reliance on high-frequency electronics can help pave safer roadways for the future.

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At present, more than 1.25 million automobile-related deaths occur each year globally, with another 50 million people injured. Improving traffic safety is a key motivation for expanding the ADAS functions of vehicles. New Car Assessment Program (NCAP) organizations in several countries and regions have established car safety roadmaps, challenging automobile manufacturers to improve safety functions to earn NCAP top vehicle safety ratings. Mobility as a Service (MaaS) is also emerging as a market to provide consumers affordable transportation options versus personal vehicle ownership, which also frees passengers to convert their driving time to higher value activities. Huawei firmware update tool free download. ADAS systems such as millimeter-wave (mmWave) radar sensors help to improve the safety of commercial automotive vehicles and, as such, are graded by the Society of Automotive Engineers (SAE) in terms of six levels of vehicle autonomy, from Level 0 (no automation) to Level 5 (full automation).

Many organizations focused on increasing vehicle safety approach vehicle automation from the ground (Level 0) up, while organizations interested in developing autonomous vehicles have great interest in Level 4 or 5 automation, where a driver becomes more of a passenger. Whatever the level of vehicle safety required, multiple sensors are needed for a reliable, full 360-deg. View of a vehicle’s environment. Electronic devices contributing to that full view include light detection and ranging (LiDAR) sensors, cameras, radar, Global Positioning System (GPS) receivers, and vehicle-to-everything (V2X) communications systems. Radar sensors are important ADAS components since they can measure the distance, velocity, and angular position of targets near a vehicle. Automotive radar sensors are currently designed at two operating frequencies: 24 and 77 GHz. While the ultrawideband 24-GHz allocation (21.65 to 26.65 GHz) will no longer be available in the U.

And Europe by 2022, narrowband 24-GHz (24.05 to 24.25 GHz) vehicle radar will continue to be available. The 77-GHz band extends from 76 to 81 GHz. Radar sensors at 24 GHz are typically used for short- and mid-range functions such as rear blind-spot detection and rear cross-traffic alert. Shorter-wavelength 77-GHz radar sensors can be employed for short-, mid-, and long-range target detection. Some long-range functions include adaptive cruise control and automatic emergency breaking.

To achieve higher levels of safety and autonomous functions, 77-GHz radar requirements will increase and evolve from their current uses for object detection to object discrimination and imaging. Greater reliance on 77-GHz radar systems will require increased distance detection, distance resolution, and elevation measurements. Circuit Materials Automotive radar sensors at 24 and 77 GHz rely on high-performance circuit laminates for reliable PCB antennas at such high frequencies. Antenna frequencies and specific performance goals will determine the circuit material requirements.

An RF/microwave circuit designer must balance the tradeoffs of circuit material properties with other antenna components to find the most cost-effective circuit material solution for a PCB antenna design. For example, there are four key circuit material properties to consider for a 77-GHz automotive radar antenna: the dielectric constant and its tolerance, the insertion loss, the electrical stability of the material, and the homogeneity of the substrate material. Signal wavelengths decrease with increasing frequencies, requiring very fine circuit features for 77-GHz PCB antennas. Because circuit substrate materials with higher dielectric-constant (Dk) values can also result in smaller circuit features for a given frequency/wavelength, circuit materials with lower Dk values, such as 3.0 (based on measurements using IPC TM-650 2.5.5.5 at 10 GHz), are often used for circuits at mmWave frequencies. Stable Dk performance is necessary, both for good performance from an individual PCB antenna and for consistent antenna-to-antenna performance over the typical time of a 10- to 15-year program. Therefore, circuit material with carefully controlled dielectric constant within a tolerance of ±0.05 or better (based on IPC TM-650 2.5.5.5 at 10 GHz) is desired. High PCB radar antenna gain aids in distance detection, and PCB radar antenna gain is optimized using circuit materials with low insertion loss.