by Angela
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When it comes to RF and microwave communication systems, choosing the right connector is crucial for ensuring signal integrity, durability, and long-term performance. One of the most trusted and widely used connectors in the industry is the N connector, also known as the Type-N connector.
Need N connectors or adapters? See our precision N series, SMA to N adapters and N terminations.
What Is an N Connector?
The N connector is a threaded, weatherproof, medium-sized coaxial RF connector designed for applications requiring durability and consistent performance at high frequencies. Developed in the 1940s by Paul Neill of Bell Labs, this connector was among the first capable of supporting microwave-frequency signals, marking a significant milestone in the evolution of RF technology.
Key Features of the N Connector
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Threaded Coupling Mechanism: The threaded design ensures a secure and stable connection, ideal for environments with vibration or mechanical stress.
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Weatherproof Design: Rugged construction provides resistance to moisture and corrosion, suitable for outdoor use.
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Wide Frequency Range: Modern N connectors can support frequencies up to 18 GHz.
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Low Signal Loss: Excellent electrical performance with low VSWR and minimal insertion loss.
Common Applications
Thanks to its versatility and reliability, the N connector is commonly used in:
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Telecommunications and wireless base stations
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Test and measurement equipment
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Radar and military communication systems
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Satellite and broadcasting infrastructure
History: Inventors and Origins
The invention of the N-Type connector is attributed to Paul Neill of Bell Labs and Carl Concelman of Amphenol. Designed as a medium-sized connector, it offered integrated weatherproofing features and the ability to handle relatively high RF power at microwave frequencies. Initially, the N-Type was rated for performance up to 1 GHz. Over time, enhancements in design extended its frequency range to 11 GHz. Precision N-Type connectors, an innovation by Julius Botka at Hewlett-Packard, further improved performance, allowing operation up to 18 GHz—approaching the theoretical limits for this type of coaxial geometry.
Coupling Thread and Torque
The N-Type connector is characterized by its threaded coupling mechanism, originally intended for hand-tightening. Today, many N-Type male connectors feature a hex-nut design, enabling repeatable torquing for consistent performance. The coupling uses a ⅝-24 UNEF thread, typically tightened to 15–20 inch-pounds (1.7–2.3 Nm), depending on the manufacturer’s specifications.
50 Ohm and 75 Ohm Versions
According to the original MIL-STD-348 specification, N-Type connectors are available in both 50 Ohm and 75 Ohm variants:
75 Ohm versions are mainly used in broadcast television and specialized testing equipment. 50 Ohm versions are widely employed in applications like cellular telecommunications, military/defense, land mobile radios, amateur radio, and test and measurement equipment. These connectors are favored for their superior voltage breakdown and power handling capabilities compared to smaller threaded connectors.
Variants: Reverse Polarity, Quick-Connect and HN
Most N-Type connectors use right-hand threading, though left-hand threading variants exist, such as those used in legacy wireless LAN systems. There are also reverse-polarity N-Type connectors, which invert the standard center pin configuration.
In recent years, quick-connect N-Type connectors have emerged, using a snap retention mechanism instead of threading for faster coupling. Another notable variant is the HN connector, designed for high-voltage applications. The HN features a larger ¾”-20 thread to prevent accidental use with standard N-Type connectors, ensuring safety and reliability in high-voltage environments.
Why Choose Reach-line for Your RF Connector Needs?
At Reach-line, we specialize in high-performance RF and microwave solutions, including a complete line of precision N connectors, adapters, cable assemblies, and custom-engineered products.
👉 You can explore our full line of Precision N Series connectors
Whether you’re building a new system or upgrading an existing one, our engineering team is ready to help you select the right components to meet your technical and operational requirements.
With industry-proven quality, responsive service, and flexible customization options, Reach-line is your trusted partner in RF innovation.
Request a Quote for N-Type Connectors and Adapters
Send us your frequency range, connector type, quantity and application, and our engineers will recommend a matching standard part or a custom build.
Request a quote → or email info@reach-line.com
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