Coaxial Connectors (RF)

Coaxial Connectors (RF) - Adapters

Part Number	Description / PDF	Quantity
SF1138-6024 SV Microwave (Amphenol SV Microwave)	CONN ADAPT SMPS PLUG-2.92MM JACK	0
SF1116-6021 SV Microwave (Amphenol SV Microwave)	SMPS MALE TO 2.4MM FEMALE ADAPTE	27
SF4532-6009 SV Microwave (Amphenol SV Microwave)	CONN ADAPT JACK-JACK TNC 50 OHM	0
SF1133-6021 SV Microwave (Amphenol SV Microwave)	2.92MM FEMALE TO 1.85MM FEMALE A	8
SF1116-6053 SV Microwave (Amphenol SV Microwave)	CONN ADAPT JACK-JACK 2.4MM 50OHM	123
SF1114-6007 SV Microwave (Amphenol SV Microwave)	CONN ADAPT BMMA PLUG TO SMA PLUG	0
1138-6013 SV Microwave (Amphenol SV Microwave)	1.85MM FEMALE TO SMPS FEMALE ADA	4
SF1116-6022 SV Microwave (Amphenol SV Microwave)	SMPS FEMALE TO 2.4MM FEMALE ADAP	22
1112-4144 SV Microwave (Amphenol SV Microwave)	SMP FEMALE TO FEMALE BULLET, SPR	34
1112-4145 SV Microwave (Amphenol SV Microwave)	SMP FEMALE TO FEMALE BULLET, SPR	50
SF1133-6003 SV Microwave (Amphenol SV Microwave)	CONN ADAPT 1.85MM TO 2.4MM JACK	0
SF1112-6025 SV Microwave (Amphenol SV Microwave)	CONN ADAPT SMP PLG TO 2.92MM JCK	21
1290-4009 SV Microwave (Amphenol SV Microwave)	CONN ADAPT JACK-JACK SMP 50 OHM	197
SF1104-6007 SV Microwave (Amphenol SV Microwave)	CONN ADAPT PN JACK TO SMA JACK	0
SF1102-6002 SV Microwave (Amphenol SV Microwave)	CONN ADAPT SMA JACK TO PTNC JACK	0
M55339/33-00001 SV Microwave (Amphenol SV Microwave)	CONN ADAPT JACK-JACK TNC 50 OHM	136
M55339/28-30002 SV Microwave (Amphenol SV Microwave)	CONN ADAPT JACK-JACK SMA 50 OHM	467
SF1115-6087 SV Microwave (Amphenol SV Microwave)	2.92MM MALE TO SMPM MALE ADAPTER	57
1115-6045 SV Microwave (Amphenol SV Microwave)	2.92MM FEMALE TO FEMALE BULKHEAD	0
1138-6009 SV Microwave (Amphenol SV Microwave)	CONN ADAPT SMPS JACK-2.92MM JACK	37

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