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RF Coaxial Connectors

ITT Cannon  

RF Coaxial Connectors

Glossary of Terms

Microwave - Very short electromagnetic waves. Frequency range

above 1 GHz.

MIL-C-39012 - The generic specification covering USA military

coaxial connectors.

MIL-C-17 - The generic Mil spec covering coaxial cables.

Mismatch - The condition in which the impedance of the source and

load are not the same. This reduces power transfer and causes

reflections.

Mounting plan - The design of the PCB or panel cut-out used to mount

the connector.

MPC Coax - Microminiature coaxial connectors for mobile telephone

or similar applications.

N Connector - This was the first true microwave connector capable of

working to 18GHz, initially designed for test applications.

Nanohex - Trade name covering SSMB & SSMC. (Discontinued).

Noise - An external electromagnetic signal which interferes with the

desired signal.

Non-captive - A component such as a contact which does not have a

retention feature.

Ohm - A measure of DC resistance or RF impedance represented by

ȉ.

Panel mount - The type of connector fitted to a chassis using a 2 or 4

hole flange mounting.

Passivation - This is a surface treatment applied primarily to stainless

steel. The process removes contaminating iron particles and produces

a passive surface.

PCB - Printed Circuit Board.

Peak power - Is the maximum power which may be handled by a

connector or cable.

Phase adjuster - A device to change the electrical length and therefore

the relative phase of a microwave signal. Sometimes referred to as a

Line Stretcher.

Plug - One half of a mating pair of connectors. The plug interface

normally goes outside the jack interface.

Posi-Lock - A positive locking device by means of a latching sleeve.

This prevents accidental disconnection of connector.

POSNS - Abbreviation for ‘‘positions’’.

Press-in mount - A connector which is mounted into a panel using a

knurled body.

PTFE - Abbreviation of polytetrafluorethylene. This is the most

commonly used dielectric (insulator) used in professional coaxial

connectors.

Push-on - See ‘‘Slide-on’’.

Push-Pull - The mating engagement of latch sleeve connectors

preventing accidental disengagement.

PWB - Printed Wiring Board.

QPL - Qualified Parts List. Parts approved to MIL-C-39012

specification.

QTTM - A range of connectors developed by ITT Cannon giving Quick

Termination and therefore reduced installation cost.

Receptacle - A term used to describe a connector usually bulkhead or

PCB mounted.

Return loss - A reason for loosing RF energy due to signals being

reflected due to a mismatch in a transmission line.

RF - An abbreviation for Radio Frequency.

RFI - An abbreviation for Radio Frequency Interference. (Electronic

Pollution).

RF leakage - The RF power lost from a transmission line or device.

Measured in dB.

RG - The traditional prefix for MIL. spec. coaxial cables.

Screw Lock - An alternative locking mechanism to prevent accidental

disconnection of connectors.

Screw-on - The mating action of connectors which are joined using a

screw thread. e.g. SMC.

Sealflex 2TM - An ITT Cannon trade name for a flexible microwave cable

assembly which has a performance similar to semi-rigid cable.

Semi-rigid cable - A coaxial cable where the outer conductor is a solid

metal tube.

SHV - A high voltage coax connector.

SISTM - ITT Cannon range of blind-mate slide-on connectors.

Skin effect - The tendency of alternating currents to flow near to the

surface of a conductor; this increases resistance and becomes more

marked the higher the frequency.

Slide-on - The mating action of connectors which push together using

low force. Also known as blind mate. e.g. BMB.

SMA - A microwave connector with normal operating frequency of

18GHz (some have been extended to 22GHz).

SMB - A snap together miniature coaxial connector normally restricted

to 4 GHz.

SMC - A miniature coaxial connector of the same size as SMB but

secured by means of a threaded coupling nut.

SMD - Sometimes used as an abbreviation for slide-on variants of

SMB. This is a misnomer, the more common use is for Surface Mount

Device.

SMS - Rack and panel slide-on connectors with the same line size as

SMA. These are covered by MIL. spec. BMB.

SMZ - A 75 ȉ snap-on connector previously known as 75 ȉ Conhex.

Also known as Type 43.

Snap-on - A term used to describe the mating action of SMB and

SSMB connectors.

Solderless SMA - An SMA connector that can be connected to

semi-rigid cable by compressing the inner body rather than by

soldering. (sometimes referred to as semi-rigid ‘crimp’ connectors.

SSISTM - ITT Cannon range of microminiature blind-mate slide-on

connectors.

SSMA - A miniature version of the SMA. This range has a theoretical

frequency capability of 40 GHz, however has limitations regarding its

physical strength.

SSMB - A micro-miniature snap-on coupling coaxial connector

(smaller SMB).

SSMC - A micro-miniature threaded coupling coaxial connector

(smaller SMC).

Stripline - A method of building a microwave circuit. The circuitry is

sandwiched between 2 ground planes. Sometimes referred to as

Tri-plate.

Teflon - Du Pont trade name for PTFE.

TEM transmission line - A high performance cable assembly.

Tensile strength - The greatest force a device can withstand without

tearing or pulling apart. This is frequently the method of determining

the effectiveness of a crimp.

TEP1E - A British Telecom Equipment Practice which uses connectors

based on the ITT Cannon 75 ȉ Conhex. Referred to as ‘‘SMZ-Type

43’’.

Teplock - A method of rapid connect/disconnect on Digital Distribution

Frames.

TNC - Thread Nut Connector same size as BNC; the only obvious

difference is the coupling nut.

Tri-plate - See Stripline.

Type 43 connectors - The SMZ coaxial connector used extensively in

telecommunication systems.

UG symbol - Used to indicate a connector made to US government

spec.

UHF - An old style coaxial connector, recently used on larger portable

cellular radio receivers as the antenna connector.

Voltage standing wave ratio (VSWR) - A way of expressing the

resultant loss of power as a result of signal reflections due to

discontinuity.

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