Coaxial Connectors (RF)

Coaxial Connectors (RF) - Contacts

Part Number	Description / PDF	Quantity
8001-4107 SV Microwave (Amphenol SV Microwave)	CONN PIN CONTACT GOLD	100
3221-40066 SV Microwave (Amphenol SV Microwave)	SMPM FEMALE VITA 67.3 CONTACT	0
SF9421-6001 SV Microwave (Amphenol SV Microwave)	CONN PIN CONTACT BMA GOLD	102
SF9421-6000 SV Microwave (Amphenol SV Microwave)	CONN PIN CONTACT BMA GOLD	265
8001-4103 SV Microwave (Amphenol SV Microwave)	CONN SOCKET CONTACT GOLD	0
SF9911-60001 SV Microwave (Amphenol SV Microwave)	CONN SOCKET CONTACT SMPS GOLD	0
8001-4101 SV Microwave (Amphenol SV Microwave)	CONN PIN CONTACT GOLD	39
3221-40071 SV Microwave (Amphenol SV Microwave)	SMPM FEMALE VITA 67.3 CONTACT	0
8001-4104 SV Microwave (Amphenol SV Microwave)	CONN SOCKET CONTACT GOLD	31
8001-4108 SV Microwave (Amphenol SV Microwave)	CONN SOCKET CONTACT GOLD	0
SF9411-6001 SV Microwave (Amphenol SV Microwave)	CONN SOCKET CONTACT BMA GOLD	103
8001-4102 SV Microwave (Amphenol SV Microwave)	CONN PIN CONTACT GOLD	0
9921-40001 SV Microwave (Amphenol SV Microwave)	CONN PIN CONTACT SMPS GOLD	8
SF3811-60059 SV Microwave (Amphenol SV Microwave)	VITA 67.3 SMPS PLUG-IN CONTACT F	50
3821-40023 SV Microwave (Amphenol SV Microwave)	SMPS VITA 67.3 BACKPLANE CONTACT	50
3821-40024 SV Microwave (Amphenol SV Microwave)	SMPS VITA 67.3 BACKPLANE CONTACT	50

Coaxial Connectors (RF) - Contacts

1. Overview

RF coaxial connectors are critical components for transmitting high-frequency electrical signals between devices. Their contacts (center contacts and outer contacts) form the core conductive path in these connectors. These components maintain signal integrity in RF systems by ensuring precise impedance matching and minimal signal loss. With the rapid development of wireless communication, 5G networks, and aerospace technologies, RF coaxial contacts have become essential for maintaining reliable high-frequency connections in modern electronics.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
BNC Contacts	Bayonet locking mechanism, 50 /75 impedance, quick-connect design	Test equipment, video systems, military radios
N-Type Contacts	Threaded coupling, weatherproof design, 0-11GHz frequency range	Cellular base stations, microwave links, broadcast systems
SMA Contacts	Subminiature threaded connectors, 0-18GHz performance	RF modules, IoT devices, aerospace avionics
SMC Contacts	Smaller threaded connectors, 0-10GHz operation	Military communication systems, medical devices
F-Type Contacts	Compression connectors, 75 impedance	Cable TV systems, satellite receivers

3. Structure and Composition

Typical RF coaxial contact structures include:

Center Contact: Precision-machined pin/socket with gold-plated brass or phosphor bronze for conductivity
Dielectric Insulator: PTFE or ceramic materials maintaining 50 /75 impedance
Outer Contact: Spring-loaded beryllium copper housing with EMI shielding
Retention Mechanism: Threaded, bayonet, or quick-lock interfaces

Advanced designs incorporate anti-reflective geometries and corrosion-resistant coatings for harsh environments.

4. Key Technical Specifications

Parameter	Importance
Impedance (50 /75 )	Ensures signal reflection minimization
VSWR (1.2:1-1.5:1)	Measures impedance matching quality
Frequency Range (DC-40GHz)	Determines operational bandwidth
Contact Resistance ( 2m )	Impacts power transmission efficiency
Dielectric Withstanding Voltage	Specifies voltage breakdown threshold
Mechanical Lifecycle (500-5000+ mates)	Defines durability rating

5. Application Fields

Major application sectors include:

Telecommunications (5G base stations, fiber optics)
Aerospace (radar systems, satellite payloads)
Test & Measurement (spectrum analyzers, signal generators)
Industrial IoT (wireless sensors, automation systems)
Broadcast (TV transmitters, studio equipment)

6. Leading Manufacturers and Products

Manufacturer	Representative Products
Amphenol	RF141-4SMA, 0-18GHz SMA contacts
TE Connectivity	Deutsch DMC Series, ruggedized N-Type contacts
Rosenberger	4.3-10 connectors for 5G massive MIMO
Molex	RF-Bay Mini coaxial contacts
Southeastern Electronics	SL Series blind-mate contacts

7. Selection Recommendations

Key selection factors:

Match impedance to system requirements (50 for data, 75 for video)
Verify frequency range vs. application needs
Consider environmental factors (temperature, vibration)
Evaluate mating cycles requirements
Select appropriate plating (gold for corrosion resistance)
Check PCB footprint compatibility for surface-mount designs

Example: For 5G massive MIMO systems, select multi-port SMA contacts with 3.5mm pitch and IP67 rating.

8. Industry Trends

Current development trends include:

Miniaturization for mobile device integration
6G-ready connectors supporting 100GHz+ frequencies
High-density arrays for MIMO systems
Advanced materials with lower PIM (Passive Intermodulation)
Smart connectors with integrated sensing capabilities