Coaxial Connectors (RF)

Part Number	Description / PDF	Quantity
SF1211-6025 SV Microwave (Amphenol SV Microwave)	CONN SMP PLUG STR 50OHM SOLDER	0
3285-6001-TD SV Microwave (Amphenol SV Microwave)	CONN SMPM PLUG STR 50OHM EDGEMNT	589
1521-60187 SV Microwave (Amphenol SV Microwave)	2.92MM FEMALE FIELD REPLACEABLE	0
SF3321-60024 SV Microwave (Amphenol SV Microwave)	CONN 1.85MM JACK STR 50 OHM SMD	43
1222-4012 SV Microwave (Amphenol SV Microwave)	CONN SMP JACK R/A 50 OHM SOLDER	35
1211-6041 SV Microwave (Amphenol SV Microwave)	CONN SMP PLUG STR 50OHM SOLDER	0
SF3321-60018 SV Microwave (Amphenol SV Microwave)	CONN 1.85MM JACK STR 50 OHM SMD	151
SF3211-60009 SV Microwave (Amphenol SV Microwave)	CONN SMPM PLUG STR 50OHM SOLDER	92
SF3211-60218 SV Microwave (Amphenol SV Microwave)	CONN SMPM PLUG STR 50 OHM SMD	89
2906-6002 SV Microwave (Amphenol SV Microwave)	CONN SMA PLUG STR 50OHM SOLDER	0
SF3321-60018-1S SV Microwave (Amphenol SV Microwave)	CONN 1.85MM JACK STR 50 OHM SMD	283
SF1755-6105 SV Microwave (Amphenol SV Microwave)	CONN BMA PLUG STR 50OHM SOLDER	0
M39012/55-3128 SV Microwave (Amphenol SV Microwave)	CONN SMA PLUG STR 50OHM CRIMP	270
1408-6002 SV Microwave (Amphenol SV Microwave)	CONN BMMA PLUG STR 50OHM SOLDER	0
3211-60086 SV Microwave (Amphenol SV Microwave)	CONN SMPM PLUG STR 50OHM EDGEMNT	54
1211-60211 SV Microwave (Amphenol SV Microwave)	SMP MALE PCB EDGE LAUNCH CONNECT	0
3211-60181 SV Microwave (Amphenol SV Microwave)	CONN SMPM PLUG R/A 50OHM EDGEMNT	9
M39012/56-3007 SV Microwave (Amphenol SV Microwave)	CONN SMA PLUG R/A 50OHM CRIMP	20
1211-66137-TD SV Microwave (Amphenol SV Microwave)	CONN SMP PLUG STR 50OHM EDGEMNT	134
SF3311-60003 SV Microwave (Amphenol SV Microwave)	CONN 1.85MM PLUG STR 50 OHM	8

Coaxial Connectors (RF)

1. Overview

RF coaxial connectors are electro-mechanical devices designed to transmit radio frequency (RF) signals between components or systems. They maintain signal integrity in coaxial cables by preserving impedance matching and shielding performance. These connectors are critical in telecommunications, aerospace, defense, and test equipment, enabling reliable high-frequency signal transmission up to 110 GHz in modern applications.

2. Main Types and Functional Classification

Type	Functional Features	Typical Applications
BNC	Bayonet coupling, 50/75 impedance, quick-connect	Test instruments, video systems, 10BASE-T Ethernet
N-Type	Threaded coupling, 50 , weatherproof	Cellular base stations, microwave links, broadcast equipment
SMA	Threaded, 0-18 GHz range, compact size	Wi-Fi antennas, GPS modules, RF modules
F-Type	Compression fitting, 75 impedance	Cable TV, satellite TV, CATV systems
LC	Miniature threaded, low PIM design	High-density telecom equipment, 5G infrastructure

3. Structure and Components

A typical RF coaxial connector consists of four key elements:

Center Conductor: Precision-machined pin/socket (beryllium copper or phosphor bronze) for signal transmission
Dielectric Insulator: PTFE or ceramic material maintaining 50/75 impedance and spacing
Outer Conductor: Brass or stainless steel shell providing 360 shielding (typical attenuation >80dB)
Connection Mechanism: Threaded (N, SMA), bayonet (BNC), or compression (F-type) interface with anti-rotation features

4. Key Technical Specifications

Parameter	Description	Importance
Frequency Range	0.01-110 GHz (varies by type)	Determines maximum usable bandwidth
Impedance	50 (standard) or 75	Matches cable/system requirements
VSWR	1.2:1 (typical) - 1.5:1 (high-performance)	Measures signal reflection efficiency
Insertion Loss	0.1-0.5 dB (varies with frequency)	Impacts signal strength preservation
Withstanding Voltage	500V-3000V AC	Safety and insulation capability

5. Application Fields

Telecommunications: 5G base stations (N-Type/LC), fiber modems (SC/FC)
Military/Aerospace: Radar systems (high-reliability N-Type), avionics (MIL-STD-348 compliant)
Test & Measurement: Spectrum analyzers (Precision SMA), oscilloscopes (BNC)
Consumer Electronics: Cable TV (F-Type), Wi-Fi routers (RP-SMA)
Industrial IoT: Wireless sensors (TNC), RFID readers (MMCX)

6. Leading Manufacturers and Products

Manufacturer	Key Products	Special Features
Amphenol	Series 5000 N-Type	IP68 rating, 0-11 GHz
TE Connectivity	Deutsch DMC	Military-grade vibration resistance
Rosenberger	4.3-10 Connector	70% smaller than N-Type, 6 GHz
Huber+Suhner	RadiX Hybrid	Combines RF and power in single interface
Southern California RF	Mini 50	High-density SMA alternative

7. Selection Recommendations

Key selection criteria include:

Frequency Requirements: BNC ( 4 GHz) vs SMA ( 18 GHz) vs 2.92mm ( 40 GHz)
Environmental Factors: Outdoor applications require IP67+ rated N-Type
Mechanical Durability: >500 mating cycles for test environments
Impedance Matching: 75 for video/cable TV systems
Space Constraints: Miniaturized options (MMCX, U.FL) for mobile devices

Case Study: In 5G massive MIMO systems, engineers prefer 4.3-10 connectors over traditional N-Type due to 30% size reduction and improved PIM performance (<-160dBc).

8. Industry Trends

Emerging development directions include:

Extreme Frequency: 110 GHz+ connectors for 6G and automotive radar
Miniaturization: 1.0mm connectors for wearable IoT devices
High-Density Integration: Multi-port arrays with integrated filters
Material Innovation: Graphene-enhanced contacts for reduced insertion loss
Smart Connectivity: Embedded sensors for real-time VSWR monitoring

Market forecasts indicate a CAGR of 7.2% (2023-2028), driven by 5G expansion and satellite internet demand.