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Johnson Components




Emerson Network Power Connectivity Solutions Announces the Johnson line of SMA Self Fixture End Launch Connectors

Emerson Network Power Connectivity Solutions, a business of Emerson (NYSE:EMR) and a global leader in protecting and optimizing critical infrastructure, announces a new family of SMA Self Fixture End Launch connectors that can help improve manufacturing costs and speed-up testing cycles.

The proprietary design feature of the SMA Self Fixture End Launch connectors accurately aligns and holds the center contact of a coaxial connector to the circuit board plane until the soldering operation is complete, all without the need for special fixtures. No mounting screws-No adapters-No aftermarket tools.

The Self Fixture connectors will overcome the gaps and RF path discontinuities associated with inconsistent soldering processes. They are manufactured to produce optimal return loss values for frequencies between 0-26.5 GHz. "This family of connectors represents the latest in a long line of Johnson products that commercialize new design technology for the benefit of every customer, states Matt Burns, product manager-Johnson."

The End Launch connector is attached to the circuit board by inserting the board edge between the legs and soldering the legs and center conductor to pads on the board. For optimum high frequency performance, the connector to circuit board transition must be adjusted for low VSWR. To compensate for the transition from coax to microstrip, trace widths A and B must be adjusted based on circuit board thickness. When properly adjusted, this technique yields a low VSWR over a wide bandwidth.

The tabulated dimensions "A", "B", "C", "D", and "E" were determined experimentally to achieve low VSWR (typically less than 1.5 up to 18 GHz). The circuit board used for these tests was double-sided FR 4 with 1 oz. copper on both sides. The copper was left on the bottom of the board to create a ground plane for the 50 Ohm microstrip structure. While not all inclusive, these dimensions are given as reference information for selected SMA End Launch connectors. Further adjustments may be necessary depending upon the application. All dimensions are in inches.



Part Number View Inventory
142-0701-801/806
142-0701-851/861
142-0701-871/876
142-0701-881/886
142-0711-821/826
142-0711-871/876
142-0711-881/886


See also:
SMA End Launch Jack Receptacle Brochure (.pdf) for more product information, specifications, applications and ordering information.
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