KH-FKRM-1003-03C FAKRA Right-Angle Connector: Enabling Stable RF Connections in Automotive Applications

With the continuous development of automotive electronics, in-vehicle communications, and radio frequency (RF) technologies, RF connectors are playing an increasingly important role in signal transmission systems. As critical components in RF signal transmission paths, connectors can affect system stability through their structural design, impedance matching, operating frequency, and environmental adaptability.

The KH-FKRM-1003-03C is a blue, 90° right-angle male FAKRA PCB-mount antenna connector introduced by Kinghelm. Featuring a right-angle design, this RF coaxial connector is suitable for electronic devices that require reliable RF signal connections while imposing certain constraints on installation space.

Kinghelm KH-FKRM-1003-03C Product Image

1. Basic Product Information

The KH-FKRM-1003-03C is an RF coaxial connector designed for PCB mounting. It features a FAKRA-series interface, a blue exterior, and a 90° right-angle male configuration. The connector uses a through-hole mounting design and is supplied in bag packaging. Its compact structure and clearly defined mounting configuration make it easier for engineers to select the appropriate connector based on interface layout and PCB design requirements.

According to the product specifications, the connector has an interface diameter of 7.5 mm and an interface length or height of 14.35 mm. It features a nominal impedance of 50 Ω, a specified operating frequency of 6 GHz, and an operating temperature range of -40°C to +105°C. The product has a single connection port and an approximate gross weight of 4.44 g.

These characteristics make it a candidate for applications requiring RF connectivity, space-efficient layouts, and operation across a specified temperature range.

2. Advantages of the 90° Right-Angle Design

Compared with straight RF connectors, 90° right-angle connectors change the direction of the connection, allowing interfaces to be arranged horizontally or laterally. This can help optimize space utilization within electronic devices.

In automotive electronic systems, communication modules, and other compact electronic products, the areas surrounding a PCB are often occupied by enclosures, wiring harnesses, and other electronic components. Connector orientation can therefore have a direct impact on the overall mechanical design.

The KH-FKRM-1003-03C features a 90° right-angle configuration, providing an option for side-facing connections during PCB layout and equipment structural design. Proper use of right-angle connectors can help reduce spatial conflicts with surrounding components and facilitate cable routing.

However, actual installation requirements should be evaluated comprehensively, taking into account PCB dimensions, cable bend radius, enclosure clearance, and connector mating orientation.

3. 50 Ω Impedance and 6 GHz Frequency Specification

Impedance matching is an important factor affecting signal transmission quality in RF systems. The KH-FKRM-1003-03C has a nominal impedance of 50 Ω, making it a candidate for circuits and equipment that use a 50 Ω RF transmission system.

When selecting this connector, engineers should ensure impedance compatibility among the connector, coaxial cable, antenna, and RF front-end circuitry. This helps minimize reflections and signal losses that may result from impedance discontinuities.

The product's specified frequency is 6 GHz, providing a reference for RF connection designs operating within the applicable frequency range. However, actual high-frequency performance also depends on the interface structure, PCB soldering quality, transmission-line design, and mating connector.

For high-frequency applications, engineers are advised to consult the product datasheet for insertion loss, return loss, voltage standing wave ratio (VSWR), and other relevant RF performance data. Appropriate testing and verification should be conducted to ensure that the connector meets the requirements of the intended system.

4. Operating Temperature and Environmental Conditions

The KH-FKRM-1003-03C has an operating temperature range of -40°C to +105°C. This broad temperature range provides a useful reference for designing certain automotive and industrial electronic devices that must operate under varying thermal conditions.

For equipment that must start at low temperatures, operate at elevated temperatures, or withstand substantial temperature fluctuations, the connector's specified operating temperature range is an important selection criterion.

In practical applications, temperature is not the only environmental factor to consider. Vibration, shock, humidity, corrosion, and long-term connection reliability should also be evaluated.

In automotive electronics applications in particular, connectors must satisfy electrical performance requirements while remaining compatible with the equipment's mechanical mounting arrangements and overall environmental protection design.

Kinghelm KH-FKRM-1003-03C Specification

5. Typical Applications and Selection Recommendations

With its FAKRA-series interface, nominal impedance of 50 Ω, and 90° right-angle configuration, the KH-FKRM-1003-03C can be considered for automotive RF connections, antenna interface designs, and the development of related communication equipment.

FAKRA interfaces are widely used in automotive RF connectivity and can support antenna and communication signal connections in systems designed to comply with the applicable interface specifications. The blue exterior may also facilitate connector identification within certain systems. However, the meaning of specific color codes should be confirmed against the product specifications and the relevant system design standards.

During the selection process, engineers should focus on the following factors:

• Mechanical compatibility: Verify that the male connector is compatible with the intended mating interface.

• Mounting requirements: Confirm that the PCB mounting method, pad layout, and soldering process are compatible with the connector's structure.

• Space constraints: Evaluate the available installation space, connector orientation, and cable routing requirements.

• Electrical performance: Check impedance requirements and the target operating frequency range.

• Environmental reliability: For applications requiring automotive-grade reliability, verify vibration resistance, mechanical durability, environmental performance, and relevant certification documentation.

The connector should not be selected solely on the basis of its appearance or basic electrical parameters. A comprehensive evaluation of mechanical, electrical, and environmental requirements is essential.

6. Conclusion

Overall, the Kinghelm KH-FKRM-1003-03C blue, 90° right-angle male FAKRA PCB-mount antenna connector is an RF coaxial connector featuring a through-hole mounting configuration. Its key specifications include a FAKRA-series interface, nominal impedance of 50 Ω, a specified frequency of 6 GHz, a 90° right-angle design, and an operating temperature range of -40°C to +105°C.

These characteristics provide a useful reference for connector selection in automotive RF systems and related electronic equipment.

In practical projects, appropriate connector selection affects not only PCB space utilization but also the overall performance of the RF signal path. By comprehensively evaluating interface compatibility, electrical parameters, mounting structure, and operating environment—and conducting the necessary tests against the product datasheet—engineers can better assess the suitability of the KH-FKRM-1003-03C for their RF connectivity applications.

About Kinghelm

Kinghelm (www.kinghelm.net) offers a wide range of electronic components and connectivity products, including Type-C, SMA, IPEX, MCX, and HDMI connectors; automotive wiring harnesses; adapter cables; pin headers; terminals; RF cables; antennas; GPS antennas; RF coaxial connectors; Wi-Fi antennas; BeiDou antennas; embedded antennas; 4G antennas; ceramic antennas; and other electronic components.

Building on its extensive experience in the electronic components industry, Kinghelm continues to develop products designed to support reliable connectivity and environmental adaptability across a variety of applications. Its product portfolio serves consumer electronics, intelligent industrial control systems, in-vehicle equipment, and other electronic applications.

Through its focus on manufacturing quality and flexible supporting solutions, Kinghelm has earned the long-term trust of customers across multiple industries, along with continued repeat business.

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