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High frequency PCB

Radar PCB

High frequency PCB

Radar PCB

Radar PCB

Product Name: Radar PCB

Material: Rogers RO3003G2 + ITEQ IT180

Quality standard: IPCB6012 Class2

Dielectric constant: 3.00

Layers: 8Layers

Thickness: 1.4mm

Copper thickness: base copper 0.5oz, finished copper thickness 1oz

Surface technology: Silver(Can choose Gold or OSP)

Application: Car driverless 77GHz Millimeter wave radar PCB

Product Details Data Sheet

Millimeter wave radar PCB has a wide application prospect. At present, iPCB adopts Rogers RO3003G2 + ITEQ IT180 to mass produce 77GHz millimeter wave radar PCB.


For different radar PCB designs of millimeter-wave radar sensors, a common feature is that ultra-low loss radar PCB material is needed to reduce circuit loss and increase antenna radiation. Radar PCB material is the key component in the design of radar sensor. Selecting the appropriate radar PCB material can ensure the stability and consistency of the millimeter-wave radar sensor.


How to Design the Performance of Radar PCB

First of all, the electrical characteristics of radar PCB materials are the primary factors in designing radar sensors and selecting radar PCB materials. Selecting radar PCB materials with stable dielectric constant and ultra low loss is essential for the performance of 77GHzmm-wave radar. The stable dielectric constant and loss can make the antenna receive and receive accurate phase, which can improve the antenna gain, scan angle or range, and improve the accuracy of radar detection and positioning. The stability of dielectric constant and loss property of PCB not only ensures the stability of different batches of materials, but also ensures that the variation within the same PCB board is small and has very good stability.


The surface roughness of copper foil used in radar PCB material will affect the dielectric constant and loss of the circuit, and the thinner the material, the greater the surface roughness of copper foil will affect the circuit. The coarser the copper foil type, the greater the roughness change of itself, will also result in greater changes in dielectric constant and loss, and affect the phase characteristics of the circuit.

Secondly, the reliability of radar PCB material needs to be considered. The reliability of PCB materials not only refers to the high reliability of materials in PCB processing, affected by the processing process, through holes, copper foil binding force, etc., but also includes the long-term reliability of materials. Whether the electrical performance of radar PCB material remains stable with time and under different working conditions such as different temperature or humidity is of great importance to the reliability of automotive radar sensor and the application of automotive ADAS system.


For the PCB antenna design of 77 GHz radar sensor, it is necessary to consider selecting materials with stable dielectric constant and ultra low loss. Smoother copper foil can further reduce circuit loss and dielectric constant tolerance change. At the same time, radar PCB materials should have reliable electrical and mechanical properties with time, temperature, humidity and other external working environment.


RO3003G2 Radar

Advantages of 77GHz band in automotive and industrial applications

RO3003G2 high frequency radar pcb material

Rogers RO3003G2 high-frequency, ceramic-filled PTFE(Teflon) laminates are an extension of Rogers's 'industry leading RO3003 solutions. RO3003G2 laminates are based on industry feedback to specially address the next generation needs for Millimeter-wave automotive radar applications.

RO3003G2 laminate's combination of optimized resin and filler content provides a lower insertion loss, ideal for use in ADAS systems like adaptive cruise control, forward collision warning and active brake or lane change assist.


RO3003G2 high frequency radar pcb material Features

Dielectric constant of 3.00 at 10 GHz and 3.07 at 77 GHz

Very Low Profile (VLP) ED copper

Homogeneous construction incorporating VLP ED copper and reduced dielectric porosity

Enhanced Filler System

Benefits

Best in class performance for insertion loss

Minimize dielectric constant variation in finished PCB

Enable trend toward more small diameter vias

Global manufacturing foot print


Advantage 1: high range resolution and ranging accuracy

Compared with the ISM band with only 200MHz bandwidth in 24GHz band, the SRR band in 77GHz band can provide up to 4GHz scanning bandwidth, significantly improving the range resolution and accuracy. Among them, range resolution represents the ability of radar sensor to separate two adjacent objects, and range accuracy represents the accuracy of measuring a single target.

Because the range resolution and accuracy are inversely proportional to the scanning bandwidth, the performance of 77GHz radar sensor is better than that of 24GHz radar, which is 20 times higher than that of 24GHz radar. In fact, the range resolution of 77GHz radar is 4cm (the resolution of 24GHz radar is 75cm).

High range resolution can better separate objects (such as people standing near cars) and provide dense points to detect objects, so as to improve the environment modeling and object classification, which is very important for the development of advanced driving assistance algorithm and automatic driving function.

In addition, the higher the resolution, the smaller the minimum distance of sensor recognition. Therefore, 77-81ghz radar has a significant advantage in applications requiring high accuracy, such as parking aid.

The 77GHz broadband has high resolution, which can be used for industrial level sensor, so that the sensor can "measure to the last drop" of liquid level - to minimize the dead zone at the bottom of the water tank, as shown in the figure. Moreover, because the high resolution can improve the minimum measurement distance, when the water tank is full, the sensor can measure the liquid level at the top of the water tank.


Advantage 2: high speed resolution and precision

The speed resolution and accuracy are inversely proportional to the radio frequency (RF) frequency. Therefore, the higher the frequency, the better the resolution and accuracy. Compared with the 24 GHz sensor, the 77 GHz sensor can reduce the power consumption.

For parking aid applications, speed resolution and accuracy are crucial, because it is necessary to operate the vehicle accurately at low speed when parking. Fig. 4 shows a representative FFT range velocity image of a point object at 1 m and depicts an improved resolution of a two-dimensional image obtained using 77 GHz.

In addition, recent studies have further improved pedestrian detection and advanced object classification algorithms by using radars with higher resolution and micro Doppler signals. The improvement of speed measurement accuracy is conducive to industrial applications, but also to improve the current situation of traffic detection under the background of automatic vehicles.


Advantage 3: smaller size

One of the main advantages of higher RF frequency is that the sensor size can be smaller. For the same antenna field of view and gain, the size of 77GHz antenna array can be reduced about three times in X and Y dimensions. This size reduction is very useful in the car, mainly reflected in the application around the car (including the door and trunk that need to install the proximity sensor) and in the car.

In the aspect of industrial fluid horizontal line sensing, higher RF frequency can provide narrower beam for antennas and sensors of the same size. The narrow beam can reduce the unnecessary reflection from the side of the tank and the interference of other obstacles in the tank, so as to obtain more accurate measurement results. In addition, for the same beam width, the higher the RF frequency, the smaller the size of the sensor and the easier to install.


Millimeter wave radar is the core technology of ADAS to improve safety and convenience. Target applications of millimeter wave radar:

Reversing automatic emergency braking (R-AEB)

Front/rear cross traffic assist function (FCTA/RCTA)

Parking Assist (PA)

Blind Spot Detection (BSD)

Cascade Imaging Radar (IMR)

Automatic emergency braking system (AEB)

Adaptive Cruise Control (ACC)

Lane Change Assist (LCA)

Radar 360° perception

Millimeter wave radar in ADAS

Millimeter wave radar in ADAS

What is the difference between 77G and 24G millimeter wave radar?

The two frequency bands of 77G and 24G millimeter wave radars are not much different in signal processing principles, but because the frequency determines the basic properties of electromagnetic waves, 77GHz millimeter waves and 24GHz millimeter waves are suitable for different application tasks. One of the main disadvantages of radar is that the angular resolution is usually relatively low. Vehicle-mounted millimeter-wave radars generally use phased array antennas for angle measurement. The antenna design is directly related to the signal wavelength. On the one hand, in order to avoid the influence of grating lobes and electromagnetic coupling, the selection of the distance between the receiving antenna array elements will be based on half the wavelength. On the other hand, a shorter wavelength means that a smaller transmitting antenna can be used. Therefore, based on the above reasons, in the same volume, the 77GHz millimeter-wave radar can design more transceiver elements and form a larger aperture than the 24GHz millimeter-wave radar, thereby obtaining a narrower beam and improving the angle measurement accuracy. 


This is very important for radar remote detection. This is because the arc length corresponding to the angular resolution unit in the polar coordinate system increases with the increase of the distance. For example, the arc length at 200 meters with a resolution of 5 degrees is about At 17 meters, it is wider than the average road, and the target cannot be distinguished in the horizontal direction. Therefore, the current 77GHz millimeter-wave radar is the mainstream solution for the forward long-range detection of cars, while the 24GHz millimeter-wave radar is mainly used for short-range detection of the rear and side of the car. The short-range 77G millimeter-wave radaris less used because the 24G millimeter-wave radar The technology is relatively mature, and the higher frequency hardware design will be more difficult and costly. According to different application backgrounds, different millimeter wave radar parameters can be designed. For example, the forward long-range can use narrow-band signals to reduce interference, while the short-range The bandwidth can be increased to improve the range resolution.


The 77GHzmm-wave radar system module is based on the design of FMCW radar. Most of them use complete single-chip solutions such as TI, Infineon or NXP. The RF front-end, signal processing unit and control unit are integrated in the chip, providing multiple signal transmission and reception channels. PCB board design varies from customer to antenna design, but there are three main ways.


a. Using ultra-low loss radar PCB material as the PCB carrier for the top antenna design, PCB antenna design usually uses microstrip patch antenna, and the layered second layer as the layer of antenna and its feeder. Other laminated radar PCB materials are FR-4. This design is relatively simple, easy to process and low cost. However, due to the thinner thickness (usually 0.127mm) of ultra-low loss radar PCB material, attention should be paid to the effect of copper foil roughness on loss and consistency. At the same time, the narrow feeder of radar PCB microstrip patch antenna requires attention to line width precision control.


b. Radar PCB design method uses dielectric integrated waveguide (SIW) circuit for antenna design. Radar PCB antenna is no longer a patch antenna. In addition to antennas, other radar PCB layers use FR-4 materials as the radar control and power layers as in the first way. Radar PCB board materials used in this SIW antenna design still use ultra low loss radar PCB materials to reduce loss and increase antenna radiation. Thickness selection of materials usually increases the bandwidth with thicker radar PCB, but also reduces the influence of copper foil roughness. There are no other problems when processing narrow linewidth. However, the hole processing and positional accuracy of SIW need to be considered.


c. The design method is to design the stacked structure of multilayer PCB plates with ultra-low loss radar PCB materials. Depending on the requirements, it is possible that several layers use ultra-low loss radar PCB material, or that all layers use ultra-low loss radar PCB material. This design method greatly increases the flexibility of circuit design, increases the degree of integration, and further reduces the size of the radar module. However, the disadvantage is that the relative cost is high and the processing of radar PCB is relatively complex.

Three Radar PCB Design

Three Radar PCB Design

The unique advantages of the 77GHzmm-wave radar sensor make it an indispensable part of automobile driving. Wider bandwidth and higher resolution 77GHz/79GHz radar sensors have gradually become the mainstream. For various radar sensor design schemes, the characteristics of radar PCB materials determine the performance of radar sensor antennas to a large extent.


For pcb technical problems, ipcb knowledgeable support team is here to help you with every step. You can also request pcb quotation here. Please contact E-mail sales@ipcb.com

We will respond very quickly.

Product Name: Radar PCB

Material: Rogers RO3003G2 + ITEQ IT180

Quality standard: IPCB6012 Class2

Dielectric constant: 3.00

Layers: 8Layers

Thickness: 1.4mm

Copper thickness: base copper 0.5oz, finished copper thickness 1oz

Surface technology: Silver(Can choose Gold or OSP)

Application: Car driverless 77GHz Millimeter wave radar PCB


For pcb technical problems, ipcb knowledgeable support team is here to help you with every step. You can also request pcb quotation here. Please contact E-mail sales@ipcb.com

We will respond very quickly.