SSMB datasheet(38/39 Pages) ITT

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142

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

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.

- 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.

- 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 snap-on connector previously known as 75 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

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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