IEC 61169-18:2011

Overview

IEC 61169-18:2011 is an international standard published by the International Electrotechnical Commission (IEC) that specifies the sectional requirements for radio frequency (RF) coaxial connectors of type SSMA. These connectors are designed with a characteristic impedance of 50 ohms and are primarily intended for millimeter wave applications up to an operating frequency of 35 GHz. The document replaces the IEC/PAS 61169-18:2009 and aligns the metric dimensions while removing inch measurements for greater international consistency.

This standard provides essential guidelines on mating face dimensions, dimensional data for both high-performance (grade 1) and standard test (grade 0) connectors, gauge information, performance characteristics, and testing methods specific to the SSMA series RF connectors. Its primary function is to support the preparation of detailed product specifications and quality assessments for manufacturers and users of SSMA connectors.

Key Topics

• Connector Types and Dimensions:

  • Detailed specifications for SSMA connectors with pin-centre and socket-centre contacts are included.
  • Grade 1 connectors represent high-performance versions with mandatory sealing gaskets, while Grade 0 connectors are standard test versions.

• Mechanical and Electrical Characteristics:

  • The standard mandates a 10-36 UNS coupling thread for secure connections.
  • Dimensions are designed assuming a PTFE dielectric with a dielectric constant of 2.02 to maintain a 50 Ω impedance.

• Performance and Test Procedures:

  • Recommended performance characteristics support the drafting of detail specifications.
  • Test schedules follow the guidelines of IEC 61169-1, including acceptance and periodic tests for assessment levels M and H.
  • Includes gauging information such as gauge pins for socket-centre contacts and specific test procedures.

• Quality Assessment:

  • Procedures for quality conformance inspection, qualification approval, and maintenance ensure connector reliability.

• Documentation and Specification Preparation:

  • Pro-forma blank detail specifications aid manufacturers in developing consistent and thorough documents.
  • Instructions cover identification, performance criteria, marking, ordering, and test selection.

Applications

SSMA connectors standardized under IEC 61169-18:2011 are widely used in high-frequency domains where signal integrity and minimal loss are crucial, including:

• Millimeter wave applications in telecommunications and radar systems.
• Connecting RF cables and microstrip lines in aerospace, defense, and high-speed communication equipment.
• Laboratories and test facilities requiring standardized interconnects for accurate measurements at frequencies up to 35 GHz.

Their 50 Ω impedance and robust 10-36 UNS threaded coupling ensure reliable performance in environments demanding precision microwave and RF connections.

Related Standards

• IEC 61169-1: Generic specification for radio-frequency connectors covering general requirements and measuring methods; forms the basis for testing and quality evaluation in IEC 61169-18.
• Other parts of IEC 61169 series: Focus on different RF connector types and specifications to provide a comprehensive framework for RF connector industry standards.

Summary

IEC 61169-18:2011 is an authoritative standard defining the critical physical, mechanical, and electrical attributes of SSMA RF coaxial connectors. By conforming to this standard, manufacturers and users achieve consistent quality and interoperability of connectors in demanding high-frequency applications. Its comprehensive scope-from dimensions and testing to quality assurance-makes it indispensable for ensuring excellence and reliability in millimeter wave and RF interconnection technologies.

Keywords: IEC 61169-18, SSMA connectors, RF coaxial connectors, radio frequency connectors, 50 ohm impedance, millimeter wave, 10-36 UNS thread, RF cable connectors, microwave frequency connectors, connector dimensional standards, IEC RF connector standards, quality assessment, IEC 61169 series.