Coaxial Connectors (RF)

Coaxial Connectors (RF) - Adapters

Part Number	Description / PDF	Quantity
SMP-FSBA-594 Connex (Amphenol RF)	CONN ADAPT PLUG-PLUG SMP 50 OHM	0
CP-N-PJG-3 Hirose	CONN ADAPT PLUG-JACK N 50 OHM	0
ADP-SMAF-MMXM Linx Technologies	SMA JACK TO MMCX PLUG ADAPTER	142
172123 Connex (Amphenol RF)	CONN ADAPT JACK-JACK N 50 OHM	424
08K118-K00S3 Rosenberger	PRECISION 1.85 ADAPTER	0
RFT-1224 RF Industries	TNC MALE-TNC MALE BARREL	76
ADT-2825-FF-NNN-02 Vitelec / Cinch Connectivity Solutions	CONN ADAPT JACK-JACK N 50 OHM	0
000-47025 Connex (Amphenol RF)	CONN ADAPT JACK-JACK BNC 50 OHM	21
UBJ24I Vitelec / Cinch Connectivity Solutions	CONN ADAPT JACK-JACK BNC 75 OHM	16
AD-NJNJ-2 Connex (Amphenol RF)	18 GHZ TYPE N JACK TO JACK LOW P	48
RQA-5402 RF Industries	QMA MALE-QMA FEMALE; R/A	62
RAD.00.250.NTM REDEL / LEMO	CONN ADAPT JACK-JACK NIM-CAMAC	119
ADT-2579-NF-SMF-02 Vitelec / Cinch Connectivity Solutions	CONN ADAPT N JACK TO SMA JACK	21
082-6348 Connex (Amphenol RF)	CONN ADAPT JACK-JACK N 50 OHM	23
122498RP Connex (Amphenol RF)	CONN ADAPT RP-TNC PLUG-TNC JACK	197
ADP-SMAF-SMAF Linx Technologies	CONN ADAPT JACK-JACK SMA 50 OHM	246
172127 Connex (Amphenol RF)	CONN ADAPT JACK-JACK N 50 OHM	0
03S107-P00S3 Rosenberger	PRECISION 3.5 ADAPTER	0
221643-1 TE Connectivity AMP Connectors	CONN ADAPT JACK-JACK SMA 50 OHM	457
122356 Connex (Amphenol RF)	CONN ADAPT PLUG TO JACK TNC	82

Coaxial Connectors (RF) - Adapters

1. Overview

RF coaxial connector adapters are passive devices enabling seamless interface between different coaxial connector types or configurations. They maintain signal integrity in radio frequency (RF) systems by ensuring impedance matching and minimizing signal reflection. These adapters play a critical role in telecommunications, test equipment, aerospace, and industrial applications where reliable RF transmission is required.

2. Main Types and Functional Classification

Type	Function Features	Application Examples
BNC Adapters	Bayonet coupling, quick-connect, 50/75 variants, up to 4 GHz	Test instruments, CCTV systems
N-Type Adapters	Threaded coupling, weatherproof, 0-11 GHz, 50	Cellular base stations, microwave links
SMA Adapters	Threaded, compact, 0-18 GHz, 50	WiFi antennas, RF modules
F-Type Adapters	Compression fittings, 75 , CATV compatible	Cable TV splitters, satellite receivers
TNC Adapters	Threaded BNC variant, vibration-resistant	Military communication systems

3. Structure and Components

Typical physical construction includes:

Center conductor: Precision-machined brass or beryllium copper with gold plating
Dielectric insulator: PTFE or ceramic material maintaining precise spacing
Outer conductor/shield: Brass or stainless steel with nickel plating
Interface mechanism: Threaded (N, SMA), bayonet (BNC), or compression (F-type)

Advanced designs incorporate EMI shielding, environmental sealing (IP68), and low-PIM (Passive Intermodulation) materials.

4. Key Technical Specifications

Parameter	Typical Range	Importance
Frequency Range	DC-40 GHz (varies by type)	Determines application suitability
Impedance	50 or 75	Matching critical for VSWR
VSWR	1.1:1-1.5:1	Measures signal reflection
Insertion Loss	0.1-0.5 dB	Impacts signal strength
Durability	500-5000 mating cycles	Affects long-term reliability

5. Application Areas

Telecommunications: 5G base stations, fiber-wireless systems
Test & Measurement: Spectrum analyzers, signal generators
Aerospace: Avionics, satellite communication systems
Industrial: RFID readers, IoT gateways
Consumer: Set-top boxes, home networking equipment

6. Leading Manufacturers and Products

Manufacturer	Representative Products
Amphenol RF	QN Series quick-connect adapters
TE Connectivity	Deutsch N-Type aerospace adapters
Rosenberger	8GHz SMA calibration kits
Keysight Technologies	3.5mm precision test adapters
ITT Cannon	SL Series space-grade connectors

7. Selection Guidelines

Key considerations:

Match impedance (50 for data/telecom, 75 for video)
Verify frequency requirements (10% headroom recommended)
Assess environmental needs (IP rating, temperature range)
Evaluate mechanical requirements (mating cycles, vibration)
Check industry certifications (MIL-STD, RoHS, REACH)

Example: Selecting N-type female-to-SMA male adapter for 3.5GHz outdoor link requires IP67 rating and <1.3:1 VSWR.

8. Industry Trends

Miniaturization: Development of 1.0/2.3mm connectors for 5G mmWave
Higher frequencies: Adapters supporting 40+GHz for automotive radar
Material innovation: Use of beryllium-free alloys for safety
Smart connectivity: Integrated sensors for condition monitoring
Environmental focus: Lead-free plating and recyclable materials