Coaxial Connectors (RF)

Coaxial Connectors (RF) - Adapters

Part Number	Description / PDF	Quantity
242263 Connex (Amphenol RF)	CONN ADAPT QMA JACK TO SMA PLUG	125
ADRMF70 Vitelec / Cinch Connectivity Solutions	CONN ADAPT JACK TO PLUG TRB	13
142248 Connex (Amphenol RF)	CONN ADAPT PLUG TO JACK SMB	335
SF2992-6001 SV Microwave (Amphenol SV Microwave)	CONN ADAPT JACK-JACK SMA 50 OHM	152
0734153351 Woodhead - Molex	CONN ADAPT JACK-JACK SMP 50 OHM	313
SF1132-6027 SV Microwave (Amphenol SV Microwave)	CONN ADAPT SMPM PLUG TO SMA JACK	176
71K501-K00N5 Rosenberger	CONN ADAPT JACK-JACK BNC 75 OHM	21
RFU-629 RF Industries	MUHF FEMALE-MUHF FEMALE	2378
31-6109 Connex (Amphenol RF)	CONN ADAPT AMC JACK-RP-BNC JACK	0
4285 Pomona Electronics	CONN ADAPT JACK-JACK SMA	126
SF1112-6035 SV Microwave (Amphenol SV Microwave)	CONN ADAPT SMP PLUG TO SMA JACK	1185
242113 Connex (Amphenol RF)	CONN ADAPT N PLUG TO SMA JACK	2010
RFB-1137 RF Industries	BNC FEMALE-UHF MALE	147
RFU-630 RF Industries	MUHF MALE-MUHF FEMALE; R/A	136
64403203211000 Würth Elektronik Midcom	COAXIAL ADAPTOR SMA PLUG - SMA P	29
1138-4002 SV Microwave (Amphenol SV Microwave)	CONN ADAPT JACK-JACK SMPS 50 OHM	0
ADT-2597-MM-TNC-02 Vitelec / Cinch Connectivity Solutions	CONN ADAPT PLUG-PLUG TNC 50 OHM	6
3290-4003 SV Microwave (Amphenol SV Microwave)	CONN ADAPT JACK-JACK SMPM 50 OHM	441
SF1133-6022 SV Microwave (Amphenol SV Microwave)	2.92MM MALE TO 1.85MM MALE ADAPT	8
RFB-1133 RF Industries	BNC MALE-BNC MALE	34

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