The critical role of ultra-thin coaxial cables in millimeter wave radar

In millimeter wave radar systems, the signal frequency is usually as high as 30GHz to 300GHz, which makes the transmission medium have extremely strict requirements for signal integrity, loss, and stability. At this point, ultra-fine coaxial cables (micro coaxial cable) become the key interconnection solution in millimeter wave radar systems due to their small space occupancy, precise structure, and stable transmission. Below, let's take a look at its several major roles in this field.

Extremely low insertion loss, ensuring high-frequency signal integrity
Millimeter wave signals have high frequency and fast attenuation, making loss control in cables particularly demanding. Extremely thin coaxial cables made of low dielectric constant materials and high-precision shielding structures can significantly reduce insertion loss and reflection loss, thus maintaining a clear signal waveform in the high-frequency band. This is of decisive significance for improving the detection range of radar and the accuracy of target identification.

Excellent phase stability and temperature adaptation ability
Millimeter-wave radar is often used in complex environments such as vehicles and drones, where temperature changes directly affect signal phase consistency. The use of ultra-fine coaxial cables made of high-performance dielectric materials (such as those with phase compensation or phase tracking characteristics) can maintain stable phase and amplitude over a wide temperature range, ensuring precise beam direction control for radar arrays and avoiding signal drift.

Micro-minimization and High-Density Wiring Advantages
For vehicle-mounted, drone, and security radar systems, controlling volume and weight is extremely important. Micro coaxial cables typically have a diameter of only 0.3mm to 0.5mm, which can easily adapt to compact space wiring. With high-density connectors, multi-channel high-speed transmission can be achieved within a limited volume, ensuring lightweight structure while enhancing radar array integration and installation flexibility.

Four, innovative process interface and structural design
In millimeter wave devices, it is often necessary to convert coaxial signals to microstrip signals on circuit boards. Traditional conversion structures are prone to reflections at high frequencies. To address this issue, a new "vertical coaxial to microstrip" transition structure has emerged. This design achieves extremely low return loss and insertion loss by optimizing the thickness of the ceramic substrate and the contact geometry, allowing millimeter wave signals to efficiently enter PCB microstrip circuits and reduce system interference.

In summary, ultra-fine coaxial cables not only meet the requirements of millimeter wave radar systems for high frequency, low loss, and phase stability, but also demonstrate unique advantages in miniaturization and structural innovation. With the rapid popularization of millimeter wave radar in the fields of automotive, industrial, and security, micro coaxial cable is undoubtedly going to become an important connection basis for high-performance radar systems.
I am[Suzhou Huichengyuan]Long-term focus on the design and customization of high-speed signal cable harnesses and ultra-thin coaxial cable harnesses, committed to providing stable and reliable high-speed interconnect solutions. If you have any related needs or want to learn more, please contact:Manager Zhang 18913228573 (same as WeChat)。