Name: Millimeter Wave Radar PCB
Brand: PCB Printed Circuit Board and PCBA manufacturing
Availability: InStock
Rating: 5 (1 reviews)

Description
Data Sheet

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Millimeter-wave radar modules typically rely on 24GHz and 77GHz PCB solutions, which serve as core components in automotive AI and autonomous driving systems.

These specialized radar PCBs hold great market potential. Our company has achieved stable mass production of 77GHz millimeter-wave radar boards using a mixed stack of Rogers RO3003G2 and ITEQ IT180.

A common requirement across different millimeter-wave sensor designs is the use of ultra‑low‑loss substrate materials. These materials minimize circuit attenuation and enhance antenna radiation efficiency, making them critical to the overall performance and long‑term stability of radar sensors. Choosing the right laminate directly determines the consistency and reliability of the finished product.

Key Considerations in Radar PCB Performance Design

Electrical properties of PCB materials are the primary consideration during sensor development. For 77GHz millimeter‑wave radar, substrates with stable dielectric constant and extremely low loss are essential. Stable Dk and loss characteristics ensure accurate signal phase transmission, improved antenna gain, better scanning angle control, and higher detection and positioning precision. Uniform material performance not only guarantees consistency between production batches but also minimizes in‑panel variation, ensuring stable radar behavior.

Copper foil surface roughness also affects effective dielectric constant and insertion loss, especially in thin‑core constructions. Rougher foil leads to greater fluctuations in electrical performance, distorting signal phase and degrading circuit behavior.

Beyond electrical performance, material reliability is equally important. This includes process stability during manufacturing, such as plating performance, via reliability, and copper peel strength, as well as long‑term environmental stability. Maintaining consistent electrical performance under varying temperatures, humidity levels, and operating lifespans is vital for automotive ADAS applications.

For 77GHz radar antenna design, low‑loss, stable‑Dk materials are preferred. Ultra‑smooth copper foil further reduces loss and Dk deviation. Materials must also maintain robust mechanical and electrical stability under harsh automotive environments.

Advantages of the 77GHz Band in Automotive and Industrial Use

Rogers RO3003G2 High‑Frequency Radar Material

RO3003G2 is a ceramic‑filled PTFE‑based high‑frequency laminate, evolved from the well‑established RO3003 series. It is specifically optimized for next‑generation automotive millimeter‑wave radar according to industry requirements.

By combining refined resin and filler systems, RO3003G2 delivers extremely low insertion loss, making it ideal for ADAS functions including adaptive cruise control, forward collision warning, automatic emergency braking, and lane change assistance.

Key Features

Dk = 3.00 @10GHz, 3.07 @77GHz
Very low profile (VLP) electrolytic copper foil
Homogeneous structure with reduced dielectric porosity
Improved filler system

Benefits

Industry‑leading insertion loss performance
Minimized Dk variation across finished boards
Supports small‑diameter via processes
Globally available manufacturing support

Advantage 1: Superior Range Resolution and Accuracy

While the 24GHz ISM band only supports approximately 200MHz bandwidth, the 77GHz SRR band offers up to 4GHz scanning bandwidth, greatly improving ranging resolution and precision. Range resolution defines the ability to distinguish adjacent objects, while range accuracy determines measurement precision for individual targets.

Since performance is inversely proportional to bandwidth, 77GHz radar achieves roughly 20× better performance than 24GHz systems. Typical range resolution reaches 4cm, compared with 75cm for 24GHz radars.

High resolution enables better object separation, denser point clouds, and improved environmental modeling and classification — critical for advanced driving algorithms and autonomous functions. It also reduces minimum detection distance, making 77–81GHz radars highly suitable for parking assistance.

In industrial liquid‑level sensing, high resolution minimizes dead zones at the bottom of tanks and allows accurate measurement even when containers are nearly full.

Advantage 2: Improved Velocity Resolution and Precision

Velocity resolution and accuracy improve with higher RF frequencies. Compared with 24GHz sensors, 77GHz devices also achieve lower power consumption.

High velocity precision is especially important in low‑speed scenarios such as parking. Improved two‑dimensional FFT imaging further enhances pedestrian detection and object classification using micro‑Doppler signals, benefiting both industrial sensing and intelligent transportation systems.

Advantage 3: More Compact Module Size

Higher RF frequencies allow significantly reduced antenna dimensions. For equivalent field of view and gain, a 77GHz antenna array can be roughly three times smaller in both X and Y dimensions. This miniaturization is highly valuable in automotive installations, including body‑mounted sensors such as door and trunk proximity detectors.

In industrial liquid‑level applications, higher frequencies enable narrower beamwidth for the same sensor size, reducing unwanted reflections from tank walls and internal obstacles. Narrow beams also allow smaller form factors for easier installation.

Radar 360° perception

Millimeter‑Wave Radar Applications in ADAS

Millimeter‑wave radar is a core ADAS technology that enhances driving safety and convenience. Typical applications include:

Rear automatic emergency braking
Front and rear cross‑traffic alert
Parking assistance
Blind spot detection
Imaging radar cascading systems
Automatic emergency braking
Adaptive cruise control
Lane change assistance
360° surround sensing

Differences Between 77G and 24G Millimeter‑Wave Radars

Although 77GHz and 24GHz radars share similar signal‑processing principles, their frequency differences lead to distinct application scenarios.

A common limitation of radar systems is relatively low angular resolution. Automotive radars typically use phased‑array antennas, whose design is closely related to wavelength. To avoid grating lobes and coupling, array element spacing is usually set to around half a wavelength. Shorter wavelengths allow smaller antennas.

Within the same module volume, 77GHz radar supports more transceiver channels and a larger effective aperture, resulting in narrower beams and higher angle accuracy — essential for long‑distance detection.

At longer distances, low angular resolution leads to poor target discrimination. 77GHz radar therefore dominates in forward‑long‑range detection, while 24GHz radar is widely used in rear and side short‑range applications due to its mature technology and lower cost. Design parameters can be adjusted based on usage scenarios: narrow bandwidth for long‑range anti‑interference, and wide bandwidth for short‑range high resolution.

Common 77GHz Radar PCB Design Structures

Most 77GHz radar modules use FMCW architectures paired with single‑chip solutions from vendors such as TI, Infineon, and NXP. These SoCs integrate RF frontends, signal processors, and control units with multiple transmit and receive channels. Antenna and PCB layouts vary by customer, but three mainstream designs exist.

Type A: Surface Antenna on Ultra‑Low‑Loss Core

The top layer uses an ultra‑low‑loss laminate as the antenna carrier, typically in microstrip patch form. The second layer supports the antenna and feed network, while remaining layers use standard FR‑4. This structure is simple, low‑cost, and easy to fabricate. However, the thin dielectric (usually 0.127mm) makes copper roughness and line‑width accuracy critical.

millimeter-wave radar circuit

Type B: Substrate Integrated Waveguide (SIW) Antenna

This design replaces patch antennas with SIW‑based radiating elements. Other layers follow the same FR‑4 structure for control and power. Ultra‑low‑loss materials are still used in the antenna region to reduce loss and improve radiation. Thicker cores increase bandwidth and reduce copper‑roughness effects, but require high precision in via fabrication and positioning.

Type C: Full Multilayer High‑Frequency Stack

This approach uses ultra‑low‑loss materials across multiple layers or throughout the entire stack. It offers maximum design flexibility, higher integration, and further miniaturization but at a higher cost and with increased manufacturing complexity.

Industry Trend and Material Selection

The superior performance of 77/79GHz radar has made it the dominant solution in modern automotive systems. For all design architectures, PCB material properties directly determine antenna and sensor performance.

To support reliable autonomous driving systems, radar PCBs require materials that maintain stable electrical behavior at 24GHz, 77GHz, and 79GHz with minimal loss and excellent thermal stability. Rogers high‑frequency laminates meet these strict ADAS requirements.

Automotive radar operates by transmitting and receiving electromagnetic waves, calculating target range using the round‑trip time of signals: R = c·τ/2.

As part of a multi‑sensor system, radar works with cameras and LiDAR to enable full environmental perception. With spectrum reallocation, 24GHz UWB radar is being phased out in many regions and replaced by 77GHz narrowband and 79GHz ultra‑wideband solutions.

Future autonomous vehicles will rely heavily on sensor fusion, combining data from multiple compact, high‑performance sensors. These demand stable, low‑loss high‑frequency materials such as the Rogers RO3000, RO4000, and RO4835 series.

At higher frequencies, circuit features become extremely small, requiring highly consistent substrates. RO3003G2 offers exceptional Dk stability and low loss for millimeter‑wave bands, while RO4830 provides a cost‑effective alternative with Dk = 3.2 @77GHz and optimized low‑profile copper foil.

Combined with high‑performance bonding materials, these laminates deliver consistent, reliable performance at 77–79GHz, supporting robust environmental sensing for safe autonomous driving.

Our company specializes in the development and manufacturing of millimeter‑wave radar PCBs. We currently provide mature mass production capabilities for both 24GHz and 77GHz radar boards. For professional radar PCB manufacturing services, please contact us for further support.

Model:77G/24G Millimeter Wave Radar PCB

Material: Rogers RO4835+S1000-2

Rogers RO3003G2+ITEQIT180/lsola 370hr

DK:3.48/3.0

Layer: 6 layer / 8 layer

Finished Thickness: 1.0-2.0mm

Copper Thickness:0.5OZ/1OZ

Color: Green/Blue/Red

Min Trace/Space: 4mil/4mil

Surface Treatment: lmmersion Gold / Silver

Through-hole treatment link Plug

Application: Automobile Millimeter Wave Radar PCB

Millimeter Wave Radar PCB

Description

Data Sheet