Coaxial Connectors (RF)

Coaxial Connectors (RF) - Adapters

Part Number	Description / PDF	Quantity
31-3220 Connex (Amphenol RF)	CONN ADAPT JACK-JACK BNC 50 OHM	51
AD-4310PSMAJ-1 Connex (Amphenol RF)	CONN ADAPT SMA JACK-4.3/10 PLUG	171
930-131A-51S Connex (Amphenol RF)	CONN ADAPT SMA PLUG TO QMA JACK	0
AD-BNCJMCXP-12G Connex (Amphenol RF)	BNC JACK TO MCX PLUG ADAPTER 50	15
83-1AP Connex (Amphenol RF)	CONN ADAPT PLUG TO JACK UHF	100
031-220N-75RFX Connex (Amphenol RF)	CONN ADAPT JACK-JACK BNC 75 OHM	610
242202 Connex (Amphenol RF)	CONN ADAPT SMB PLUG TO SMC JACK	23
000-79700 Connex (Amphenol RF)	CONN ADAPT PLUG TO JACK TNC	21
031-218-75-12G Connex (Amphenol RF)	ADAPTER, BNC PLUG TO BNC PLUG, 1	13
112456 Connex (Amphenol RF)	CONN ADAPT JACK-JACK BNC 75 OHM	19
AD-4310P4310J-2 Connex (Amphenol RF)	CONN ADAPT PLUG-JACK 4.3/10	20
242131 Connex (Amphenol RF)	CONN ADAPT TNC PLUG TO N JACK	609
APH-NJ-MCXJ Connex (Amphenol RF)	CONN ADAPT N JACK TO MCX JACK	0
112444-12G Connex (Amphenol RF)	ADAPTER BNC JACK TO JACK 75 OHM	114
AD-4310JNJ-1 Connex (Amphenol RF)	CONN ADAPT N JACK TO 4.3/10 JACK	10
901-167 Connex (Amphenol RF)	CONN ADAPT BNC JACK TO SMA JACK	12
SMP-FSBA-645 Connex (Amphenol RF)	CONN ADAPT PLUG-PLUG SMP 50 OHM	7849
APH-HDBNCP-SMAJ Connex (Amphenol RF)	ADAPT HDBNC PLUG/SMA JACK 50 OHM	0
APH-SMAF-AFIM Connex (Amphenol RF)	CONN ADAPT SMA JACK TO AFI PLUG	0
112532 Connex (Amphenol RF)	CONN ADAPT JACK TO PLUG BNC	239

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