Today, with the continuous growth in demand for high-speed and high-frequency signal transmission, ultra-fine coaxial cables (Micro Coaxial Cable) have found wide application in precision electronic fields such as high-definition cameras, laptops, medical imaging equipment, and vehicle systems, thanks to their miniaturized structure, high transmission bandwidth, and excellent signal integrity. However, electromagnetic interference (EMI) and signal crosstalk issues that come with high-frequency signals often become challenging problems for engineers in the design and debugging phases. This article will take Hirose DF36-40P-0.4SD as an example and guide you through five key steps to systematically solve the signal interference problems of ultra-fine coaxial cable bundles.
Step 5 to Solve Micro Coaxial Cable Signal Interference Issues
Step 1: Opt for high-performance connectors
The first step in solving signal interference is to choose a connector with excellent shielding performance and high contact reliability.
Hirose DF36-40P-0.4SD is a super-thin coaxial connector with a 40Pin and 0.4mm pitch, designed for high-speed transmission. It has excellent EMI suppression capabilities, which can significantly improve the stability and consistency of signal transmission.
Step 2: Rationalize wire harness layout
The internal structure of the extremely fine coaxial cable is precise. If the wiring is too dense, the cable is too long, or it is parallel to high-power cables, it will lead to increased signal crosstalk and electromagnetic interference (EMI).
In the design phase, it is advisable to shorten the cable length as much as possible, avoid high-noise areas, and reduce loops and crossings through reasonable routing to minimize interference risks from the source.
Step 3: Strengthen grounding and shielding design
DF36-40P-0.4SD connector is equipped with a metal shielded shell structure, combined with a multi-layer shielding layer of extremely thin coaxial cables, which can achieve 360°all-around protection.
At the same time, it should be ensured that there is a low-impedance connection between the shield layer of the connector and the system ground, avoiding floating or loose connections, thereby further enhancing the system's anti-interference performance.
Step 4: Optimize PCB routing strategy
In high-frequency applications, PCB routing has a significant impact on signal integrity. It is necessary to ensure that signal lines are of equal length, impedance matched, and kept away from high-noise device areas.
The pad layout design of Hirose DF36-40P-0.4SD is compact, supporting high-density on-board applications and facilitating the optimization of integrity and balance in high-speed signal paths.
Step 5: Conduct Signal Integrity Testing
During the prototype verification and pre-mass production stage, comprehensive evaluation of the cable system's signal performance should be conducted through means such as TDR (Time Domain Reflectometry), S-parameter testing, and EMI testing. Optimize the design plan in a timely manner through data feedback to ensure that the final product maintains signal stability and anti-interference capability under high-speed transmission.
Hirose DF36-40P-0.4SD connector introduction
DF36-40P-0.4SD(51) is a high-density connector specifically designed for Micro Coaxial Cable, suitable for applications with limited space and extremely high requirements for signal integrity, such as:
High-definition camera and imaging system
Medical Imaging and Detection Equipment
Drone and vehicle-mounted image module
Industrial and consumer electronics high-frequency interface
Main specifications parameters:
Type: Plug
Pin count: 40Pin
• Spacing: 0.4mm
Rated Current: 0.25A
• Rated voltage (AC): 30V
• Applicable wire gauge: AWG 40 ~ AWG 46
Through scientific connector selection, cable harness layout optimization, shielding and grounding design, and supplemented by strict signal integrity verification, it can effectively suppress EMI issues and ensure the stability and high-efficiency transmission performance of ultra-thin coaxial cable harnesses in high-frequency systems.
The excellent structural design and electrical performance of Hirose DF36-40P-0.4SD provide an ideal interconnection solution for high-speed, miniaturized products.
We have been focusing on the design and customization of high-speed cable harnesses and ultra-fine coaxial cable harnesses for a long time, committed to providing stable and reliable high-speed interconnect solutions. If you have any related needs or would like to learn more, please contact: Yin Manager.
18913280527 (WeChat same number). 
