Coaxial Connectors (RF)

Coaxial Connectors (RF) - Adapters

Part Number	Description / PDF	Quantity
31-219 Connex (Amphenol RF)	CONN ADAPT JACK-JACK BNC 50 OHM	433
138-4901-407 Vitelec / Cinch Connectivity Solutions	CONN ADAPT JACK-JACK N 50 OHM	147
53S164-K00N1 Rosenberger	CONN ADAPT N PLUG TO 4.3/10 JACK	12
1138-4001 SV Microwave (Amphenol SV Microwave)	CONN ADAPT JACK-JACK SMPS 50 OHM	374
031-6769 Connex (Amphenol RF)	TNC BULHEAD JACK TO MCX JACK IP6	31
RFD-43F-NF RF Industries	4.3/10 FEMALE-N FEMALE	308
262129 Connex (Amphenol RF)	CONN ADAPT JACK-JACK MMCX 50 OHM	49
134-1018-031 Vitelec / Cinch Connectivity Solutions	CONN ADAPT MCX PLUG TO SMA JACK	27
09KR121-K0AS3 Rosenberger	PRECISION 2.40 TESTPORT ADAPTER	0
29-3855 Vitelec / Cinch Connectivity Solutions	CONN ADAPT SMA PLUG TO BNC JACK	1310
192109 Connex (Amphenol RF)	CONN ADAPT FME PLUG TO N PLUG	17
RFD-4195-1953 RF Industries	4.1/9.5 FEMALE-4.1/9.5 FEMALE	67
60K164-S60N1 Rosenberger	CONN ADAPT 7-16 JACK - 4.3/10 PL	45
0733860831 Woodhead - Molex	CONN ADAPT SMA PLUG-SSMCX PLUG	52
SMP-FSBA-1316 Connex (Amphenol RF)	ADAPTER, SMP PLUG TO SMP PLUG, F	18
ADAPT/MMCXM/SMAF Siretta	CONN ADAPT SMA JACK TO MMCX PLUG	72
SF1158-6001 SV Microwave (Amphenol SV Microwave)	CONN ADAPT BMA PLUG TO SMA JACK	0
19K104-K00L5 Rosenberger	ADAPT SMP JACK - SMP JACK	301
242143 Connex (Amphenol RF)	CONN ADAPT SMA JACK TO MMCX JACK	300
ADP-NM-FF RF Solutions	CONN ADAPT N PLUG TO F JACK	7

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