TRB (Triaxial Bayonet) Connector

TRB (Triaxial Bayonet) Connectors: An In-Depth Exploration

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TRB (Triaxial Bayonet) Connector

Introduction

The TRB connector is a triaxial RF connector designed for applications requiring superior shielding and minimal signal interference. Its bayonet-style coupling mechanism ensures secure connections, making it suitable for environments where reliability is paramount.​

Design and Structure

TRB connectors are engineered to interface with triaxial cables, which consist of three conductors: a central conductor, an intermediate shield, and an outer shield. This configuration provides enhanced electromagnetic interference (EMI) protection compared to standard coaxial cables.​

The connector features a three-lug bayonet coupling, distinguishing it from the two-lug design of standard BNC connectors. This design ensures a more secure connection and prevents accidental disconnection in high-vibration environments.​

Technical Specifications

  • Impedance: Non-constant; varies depending on application.
  • Frequency Range: DC to 500 MHz.
  • Voltage Rating: 400 volts RMS.
  • Dielectric Withstanding Voltage: 1,200 VRMS.
  • Insulation Resistance: 5,000 megohms.
  • Contact Resistance:
    • Center Contact: ≤5.0 milliohms.
    • Intermediate Contact: ≤0.5 milliohms.
    • Outer Contact: ≤0.5 milliohms.
  • Temperature Range: −65°C to +165°C.
  • Mating Cycles: Typically rated for 500 mating cycles.
  • Cable Retention: Minimum of 40 pounds.

Applications

TRB connectors are utilized across various industries due to their superior shielding and reliability:​

  • Broadcasting: Used for transmitting high-quality video signals in television studios and equipment.
  • Medical Equipment: Employed in imaging systems and diagnostic devices requiring low-noise signal transmission.
  • Test and Measurement: Commonly found on oscilloscopes, signal generators, and other laboratory equipment.
  • Military and Aerospace: Applied in avionics and military communication systems where signal integrity is critical.
  • Nuclear Instrumentation: Used in radiation detection equipment due to their excellent shielding properties.​

Advantages

  • Enhanced Shielding: The triaxial design provides superior EMI protection compared to coaxial connectors.
  • Secure Connection: The three-lug bayonet coupling ensures a reliable and vibration-resistant connection.
  • Versatility: Suitable for both analog and digital signals across various frequencies.
  • Durability: Designed to withstand harsh environmental conditions and frequent mating cycles.​

Considerations

  • Impedance Matching: It’s crucial to match the connector’s impedance with the system to prevent signal reflections.
  • Frequency Limitations: While suitable for many applications, TRB connectors may not perform optimally at very high frequencies compared to other connector types.
  • Size and Weight: In applications where space and weight are critical, smaller connectors like TRS or TTM may be more appropriate.​

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