mobile | classic
Dataweek Electronics & Communications Technology Magazine





Follow us on:
Follow us on Facebook Share via Twitter Share via LinkedIn


Search...

Electronics Buyers' Guide

Electronics Manufacturing & Production Handbook 2019


 

The making of low-PIM coaxial cable assemblies
30 April 2019, Interconnection

Modern complex multi-carrier communication systems such as these are now incredibly wideband and support a plethora of wireless standards, such as Wi-Fi, cellular, military, government, public safety and emergency bands. And there is only an expanding number of sub-6 GHz wireless standards and technologies, including Internet-of-Things (IoT) devices, new 5G-NR sub-6 GHz services, TV white space (TVWS) devices, and more.

Many of these standards cover frequencies that, if mixed by passive means, would cause distortion in any of the other bands. The greater the bandwidth of a system, the more potential for PIM distortions to cause reduced throughput, loss of service, and even system failures.

Hence, low-PIM coaxial cable assemblies comprised of both low-PIM cable and low-PIM connectors are being employed more often as jumpers and interconnects between wireless system components. The value of low-PIM cable assemblies is that they are tested, and hopefully certified, for low-PIM operation. If installed correctly in a system that is also otherwise designed for low-PIM performance, these interconnect shouldn’t add any significant PIM and mitigate the distortion that would normally be contributed by cables with a higher PIM rating.

The construction of a low-PIM cable assembly typically involves three main parts: the two end connectors and the coaxial cable itself. Each of the end connectors – commonly DIN 7/16, 4.3-10, Type N and 4.1/9.5 for communication system applications – should be low-PIM rated and include hardware to attach to the coaxial cable that also facilitates a low-PIM installation.

As any additional connections could lead to an increased level in system PIM, connectors should be chosen that eliminate the need for adaptors at either end. This may require male-to-male or male-to-female connectors, or a different connector type and gender on each end.

Cable assemblies with different connector types are commonly known as between-series, where cable assemblies with the same connector type are known as in-series. Moreover, right-angle adaptors are often used in confined and difficult installation situations. However, using low-PIM and right-angle connectors for the cable assembly could lead to better PIM performance than relying on additional right-angle adaptors.

The coaxial cable should also be low-PIM rated, and also satisfy building code requirements. For building codes, UL910 ratings for plenum coaxial cables meet most building code requirements. Often low-PIM coaxial cables are made of solid inner and outer conductors, as solid conductors tend to perform better in low-PIM applications than braided.

As solid conductors are less flexible, it is also common to have corrugated outer conductors to enable some flexibility and to ease installation. A solid outer conductor also provides better shielding than braided conductors, which could be useful in installations with a dense number of services and connections and nearby transmitters.

Lastly, the assembly of the complete cable needs to be done in a way that ensures low-PIM operation, and testing is also necessary to ensure that any manufacturing defects in any of the components or assembly process don’t produce a failing unit. Having the PIM performance listed on the cable can make installation much easier when evaluating the overall system’s PIM performance, especially during troubleshooting.

For more information contact Andrew Hutton, RF Design, +27 21 555 8400, andrew@rfdesign.co.za, www.rfdesign.co.za


Credit(s)
Supplied By: RF Design
Tel: +27 21 555 8400
Fax: 086 653 2139
Email: sales@rfdesign.co.za
www: www.rfdesign.co.za
  Share on Facebook Share via Twitter Share via LinkedIn    

Further reading:

  • Compression lugs and splices
    26 June 2019, TRX Electronics, Interconnection
    Panduit Pan-Lug compression connectors provide permanent terminations for a variety of power and grounding applications. The connectors are designed for use with many different code and flex conductor ...
  • Positioning module for autonomous driving
    26 June 2019, RF Design, Telecoms, Datacoms, Wireless, IoT
    The ZED-F9K from u-blox is a high-precision multiband GNSS (global navigation satellite system) module with built-in inertial sensors. The module combines the latest generation of GNSS receiver technology, ...
  • Test point pins
    26 June 2019, Vepac Electronics, Interconnection
    The range of terminal pins available from Vero Technologies provide an easily useable fitting on a through-hole printed circuit board (PCB) for the attachment of oscilloscope probes, multimeter leads ...
  • Pin strips for KNX applications
    26 June 2019, Wiltron Agencies, Interconnection
    The pins of the STL190 through-hole pin strips were designed by PTR specifically for KNX applications in home, building and system technology. Positioned by means of a carrier pad at a spacing clearance ...
  • Positioning and cellular antenna
    26 June 2019, RF Design, Telecoms, Datacoms, Wireless, IoT
    The Tycho MA310 antenna is a combination, small form factor GPS/GLONASS and penta-band cellular (GSM/GPRS/CDMA/ PCS/DCS/ WCDMA/UMTS) antenna to simplify AVL or fleet management antenna systems worldwide. Made ...
  • RF power doubler
    26 June 2019, RF Design, Telecoms, Datacoms, Wireless, IoT
    The QPA3357 from Qorvo is a power doubler that operates from 47 to 1218 MHz. It provides an output power of 57 dBm, a gain of 28 dB, and has a noise figure of 4,5 dB. This power doubler is matched to ...
  • Flexible wideband antenna
    26 June 2019, RF Design, Telecoms, Datacoms, Wireless, IoT
    The Taoglas FXUB64.18.0150C flexible wideband antenna has been designed to cover all working frequencies in the 600-3000 MHz spectrum, covering all cellular, 2,4 GHz Wi-Fi, ISM, NB-IoT, CAT-M1 and A-GPS ...
  • High-frequency power dividers
    26 June 2019, RF Design, Telecoms, Datacoms, Wireless, IoT
    Pasternack has launched a new series of high-frequency power dividers targeted at 5G cellular communication, automotive radar and satellite communication applications. The lineup consists of 17 new ...
  • High-temperature FFC/FPC connectors
    26 June 2019, Otto Marketing, Interconnection
    Hirose Electric’s new FH52K series of robust flat flexible cable/flat printed circuit (FFC/FPC) connectors are designed to withstand higher operating temperatures than standard FFC/FPC connectors. The ...
  • Cellular module for LPWA applications
    26 June 2019, RF Design, Telecoms, Datacoms, Wireless, IoT
    u-blox has announced the SARA R5 series of LTE M and NB-IoT modules for low power wide area (LPWA) IoT applications. The module, built on the UBX R5 cellular chipset and the M8 GNSS receiver chip, is ...
  • Hinged 4G LTE antenna
    26 June 2019, RF Design, Telecoms, Datacoms, Wireless, IoT
    The hinged Apex II TG.35 wideband dipole antenna from Taoglas has been designed to cover all cellular, ISM and Wi-Fi working frequencies in the 600-6000 MHz spectrum. It has been primarily designed for ...
  • Modular fibre-optic patch panel
    26 June 2019, Webb Industries, Interconnection
    The latest from Webb Industries is Telegärtner’s Fibre Termination Box (FTB) – a modular fibre-optic patch panel system which facilitates customised cabling in locations where large numbers of apartments ...

 
 
         
Contact:
Technews Publishing (Pty) Ltd
1st Floor, Stabilitas House
265 Kent Ave, Randburg, 2194
South Africa
Publications by Technews
Dataweek Electronics & Communications Technology
Electronics Buyers’ Guide (EBG)

Hi-Tech Security Solutions
Hi-Tech Security Business Directory

Motion Control in Southern Africa
Motion Control Buyers’ Guide (MCBG)

South African Instrumentation & Control
South African Instrumentation & Control Buyers’ Guide (IBG)
Other
Terms & conditions of use, including privacy policy
PAIA Manual





 

         
    Classic | Mobile

Copyright © Technews Publishing (Pty) Ltd. All rights reserved.