Coaxial Connectors (RF)

Coaxial Connectors (RF) - Adapters

Part Number	Description / PDF	Quantity
4298 Pomona Electronics	CONN ADAPT SMA PLUG TO N JACK	11
3847 Pomona Electronics	CONN ADAPT JACK-JACK BNC 50 OHM	1008
6737 Pomona Electronics	CONN ADAPT JACK-JACK BNC 75 OHM	188
72979 Pomona Electronics	CONN ADAPT SMB PLUG TO SMA JACK	612
73053 Pomona Electronics	CONN ADAPT PLUG TO JACK TNC	3
6256 Pomona Electronics	CONN ADAPT N PLUG TO 7/16 PLUG	0
72968 Pomona Electronics	CONN ADAPT JACK-JACK SMA 50 OHM	11
5299 Pomona Electronics	CONN ADAPT BNC PLUG - TRIAX JACK	272
4295 Pomona Electronics	CONN ADAPT SMA JACK TO TNC JACK	26
4299 Pomona Electronics	PLUG ADAPTER,SMA FEMALE'N'FEMALE	14
4282 Pomona Electronics	CONN ADAPT PLUG TO JACK SMA	0
4293 Pomona Electronics	CONN ADAPT SMA JACK TO TNC PLUG	13
6744 Pomona Electronics	CONN ADAPT JACK-JACK BNC 75 OHM	585
72977 Pomona Electronics	CONN ADAPT SMA PLUG TO SMB JACK	39
72973 Pomona Electronics	CONN ADAPT JACK-JACK SMA 50 OHM	1064
5178 Pomona Electronics	CONN ADAPT JACK-JACK BNC TRIAX	51
5090 Pomona Electronics	CONN ADAPT TRIAX PLUG - BNC JACK	24
6705 Pomona Electronics	CONN ADAPT JACK-JACK BNC 75 OHM	43
5090# Pomona Electronics	BNC (F)/TRIAXIAL (M) PACKAGED	0
1661-C-24 Pomona Electronics	CONN ADAPT BNC MALE RG58C/U MTO	0

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