Coaxial Connectors (RF)

Coaxial Connectors (RF) - Adapters

Part Number	Description / PDF	Quantity
031-9-75 Connex (Amphenol RF)	CONN ADAPT JACK TO PLUG BNC	18
252169 Connex (Amphenol RF)	CONN ADAPT JACK-JACK MCX 50 OHM	125
242261 Connex (Amphenol RF)	CONN ADAPT QMA PLUG TO SMA JACK	258
222157-12 Connex (Amphenol RF)	CONN ADAPT JACK TO PLUG F 75 OHM	0
242265 Connex (Amphenol RF)	CONN ADAPT N JACK TO SMA PLUG	5
APH-HD-ISO-1023 Connex (Amphenol RF)	CONN ADAPT BNCHD JCK-1.0/2.3 JCK	0
132274 Connex (Amphenol RF)	CONN ADAPT JACK-JACK SMA 50 OHM	375
242203 Connex (Amphenol RF)	CONN ADAPT BNC PLUG TO MCX JACK	135
242150 Connex (Amphenol RF)	CONN ADAPT BNC JACK TO TNC JACK	104
925-167A-51S Connex (Amphenol RF)	CONN ADAPTER SMPM PLUG - PLUG	121
242193 Connex (Amphenol RF)	CONN ADAPT MMCX PLUG TO SMA JACK	203
531-40008 Connex (Amphenol RF)	CONN ADAPT JACK-JACK F 75 OHM	12
122346 Connex (Amphenol RF)	CONN ADAPT JACK-JACK TNC 50 OHM	107
242112RP Connex (Amphenol RF)	CONN ADAPT RP SMA PLUG TO N JACK	161
APH-SMAF-AFIF Connex (Amphenol RF)	CONN ADAPT SMA JACK TO AFI JACK	42
SMP-FS2A-2030 Connex (Amphenol RF)	ADAPTER, SMP PLUG TO SMP PLUG, F	85
242104 Connex (Amphenol RF)	CONN ADAPT BNC PLUG TO SMA PLUG	577
AD-QMAPQMAP-1 Connex (Amphenol RF)	QMA PLUG TO QMA PLUG ADAPTER 50	25
AD-NJBNCJ-1 Connex (Amphenol RF)	N JACK TO BNC JACK 75 OHMS ADAPT	24
272300 Connex (Amphenol RF)	CONN ADAPT JACK-JACK 7/16 50 OHM	10

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