5G communication testing, wireless terminal automated testing
Aerospace communication systems
Precision measurement equipment, radio frequency signal control of radar transmitters
Communication and navigation systems
Optical communication module-related testing
Interconnection of wireless communication base stations
The N-type connector (or "Type N") is a threaded, weatherproof coaxial RF connector designed for medium-power applications up to about 11 GHz. It is the standard interconnect for cellular base stations, broadcast transmitters, test equipment, RF antennas, and any system needing reliable performance with low loss and high power handling. N connectors come in 50 Ω (most common) and 75 Ω (broadcast video) versions.
The N connector was invented by Paul Neill at Bell Telephone Laboratories in 1942. It is named after its inventor (Neill) — a common practice for RF connectors (others include SMA for SubMiniature version A, and BNC for Bayonet Neill-Concelman). The original design solved the need for a robust, weatherproof connector for microwave systems during World War II.
Through decades of refinement, the N connector became the de facto standard for medium-power RF up to 11 GHz and remains ubiquitous in cellular, broadcast, defense, and test equipment.
N connectors use a 5/8"-24 threaded coupling. The outer contact also uses slots and fingers for a robust, low-loss connection.
N connectors use a 5/8"-24 UNEF threaded interface. The plug has a center pin and threaded outer body; the jack has a center socket and threaded outer body with a hex flange for mounting. The coupling nut is tightened with a wrench to the recommended torque (typically 12 – 15 in-lbs for the standard N).
| Specification | Typical Value |
|---|---|
| Frequency Range (50 Ω) | DC – 11 GHz (precision: 18 GHz) |
| Frequency Range (75 Ω) | DC – 1.5 GHz |
| VSWR (DC – 11 GHz) | ≤ 1.30:1 (precision ≤ 1.10:1) |
| Insertion Loss (DC – 11 GHz) | ≤ 0.15 dB |
| Dielectric Withstanding Voltage | 2,500 V RMS |
| Insulation Resistance | ≥ 5 GΩ |
| Center Contact Resistance | ≤ 1 mΩ |
| Outer Contact Resistance | ≤ 0.2 mΩ |
| RF Leakage | ≥ −90 dB |
| Specification | Value |
|---|---|
| Impedance | 50 Ω standard, 75 Ω available |
| Threading | 5/8"-24 UNEF |
| Mating Cycles | 500 minimum |
| Coupling Torque | 12 – 15 in-lbs (1.4 – 1.7 N·m) |
| Body Material | Brass, nickel-plated or stainless steel |
| Center Contact | Gold-plated brass or beryllium copper |
| Dielectric | PTFE (Teflon) |
| Operating Temperature | −65 °C to +165 °C |
| Weatherproof | Yes (with proper gaskets) |
The most common type. Used from DC to 11 GHz in cellular, broadcast, and test equipment.
Tighter tolerances for VSWR. Used in metrology and VNA test ports up to 18 GHz.
Used in CATV and broadcast video. Different center pin diameter; not intermateable with 50 Ω N.
Larger body, better dielectric, and cooling features for kilowatt applications. Used in broadcast transmitters.
Swapped center pin/socket. Used in some Wi-Fi and legacy equipment to prevent unauthorized antenna changes.
Snap-on version for faster mating. Reduced mechanical robustness and lower frequency range.
| Connector | Frequency | Power | Coupling | Use |
|---|---|---|---|---|
| N-Type | DC – 11 GHz | 500 W CW | Threaded | Cellular, broadcast, defense |
| SMA | DC – 18 GHz | 200 W CW | Threaded | Lab, instrumentation |
| TNC | DC – 11 GHz | 500 W CW | Threaded (smaller than N) | Wi-Fi antennas, GPS |
| BNC | DC – 4 GHz | 100 W CW | Bayonet | Test, video, low-frequency RF |
| 7-16 DIN | DC – 7.5 GHz | 2,800 W CW | Threaded | High-power cellular |
The N-type connector is a threaded, medium-power coaxial RF connector designed by Paul Neill in 1942. It operates from DC to 11 GHz (precision versions to 18 GHz) and is used for cellular, broadcast, test, and defense applications.
The "N" stands for Neill, the surname of its inventor Paul Neill at Bell Labs.
Standard N connectors are rated to 11 GHz. Precision N connectors (e.g., APC-7) reach 18 GHz.
Mechanically yes, but the impedance mismatch causes reflections and degraded performance. Use the correct impedance version for your system.
Both are threaded medium-power RF connectors. 7-16 DIN handles higher power (~ 2,800 W CW) and has lower intermodulation, making it preferred for cellular macro cells. N is more general-purpose.
High-tech Enterprise, Feifeng Talent
Chief Engineer Wang graduated with a master's degree in high-power microwave from the Institute of Electronics, University of Chinese Academy of Sciences.
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