Cinch Connectivity
Solutions
High Frequency
End Launch Connectors
HIGH FREQUENCY SMA END LAUNCH CONNECTORS
Applications
High Frequency SMA End Launch Connectors
For Microwave PC Board Substrates
The Johnson
®
Patent Pending High Frequency End Launch connectors are
used to transition microwave energy from coaxial to planar transmission line
structures. These patent pending connectors provide a unique solution for
microwave engineers who fabricate circuit designs on very thin high frequency
board substrates. The in-line connector design minimizes reflections as
compared to a right-angle (perpendicular) pc mount transition.
Applications for these connectors include:
Cellular Linear Power Amplifiers
Broadband MMIC Power Amplifiers
Microwave Filters, Mixers and Combiners
Wireless Infrastructure Antennas
DBS Low-Noise Block Down Converters
Remote Sensing and Metering
Global Positioning Satellite Antennas
Phased Array Antennas
Radar Systems
High Speed Routers and Switches
Automated Test Equipment
RF Identification Tags
The Johnson® High Frequency End Launch connector is designed to
attach directly to a high frequency coplanar waveguide (CPW) circuit board
transmission line, although other lines such as microstrip can be used with
good results. These connectors can be used on high frequency PC board
substrate layers as thin as 8 mils, and operate at frequencies up to 26.5 GHz
(see Return Loss chart).
“PATENT PENDING”
Typical Return Loss
Measured on 50 ohm GCPW fabricated
on Rogers® RO-4003™ substrate
142-0761-811 (8 mil substrate)
142-0761-871 (16 mil substrate)
VSWR = 1.05+.02F(GHz)
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HIGH FREQUENCY SMA END LAUNCH CONNECTORS
Design Features
This connector is an economical alternative to other high frequency designs in
the industry. This patent pending design differentiates itself from other launch
connectors:
Design of the connector is self contained, no external mounting screws,
adapter sections, spring clips, etc. are required for assembly to the circuit
board.
Center contact pin does not require special orientation to the surface of the
circuit board. The center contact is mechanically captivated and optimized
to maintain proper impedance while withstanding torque and axial force
stress.
Output coax of the connector at board launch is sized appropriately to
match the thickness of the high frequency board substrate. The output coax
section extends well within the connector while maintaining constant inner
and outer coaxial diameters.
Signal side grounding legs of the connector are spaced close enough to
keep grounding paths short, but far enough apart to maintain constant
impedance in the launch transition area.
Signal side grounding legs and GCPW geometry control radiation, no
additional shielding is required to prevent signal cross-talk effects in the
transition area. The launch transition is effectively isolated from adjacent
transmission lines in the signal plane.
Connector is not locked into position when placed on the circuit board.
Intentional floating design allows proper alignment in X, Y and Z, minimizing
discontinuities due to manufacturing tolerances.
The new distinctive through hole mounting technique allows the use of
one connector with varying circuit board thicknesses. The connectors are
also available in a traditional straddle mount end launch design, which was
pioneered by Emerson Network Power Connectivity Solutions over 20 years
ago.
A small amount of PTFE insulation projects from the rear mating plane of
the connector, acting as a seal when soldering the center conductor pin to
the trace. The connector is held against the circuit board edge during the
soldering process, compressing the PTFE insulation. This effectively creates
a barrier between the inner and outer conductors, preventing the bridging of
solder.
Appropriate sized connectors do not require additional compensation
to standard coplanar or microstrip matched impedance line geometries.
Transition can be fine-tuned by pulling the trace back a slight amount from
the board edge.
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HIGH FREQUENCY SMA END LAUNCH CONNECTORS
Specifications
ELECTRICAL SPECIFICATIONS
Impedance:
50 Ohms
Frequency Range:
0-26.5 GHz
VSWR:
1.05+.02F(GHz) maximum at 0-18 GHz, <1.50 typical
at 18-26.5 GHz
Working Voltage:
170 Vrms maximum at sea level,
45 Vrms maximum at 70K feet
Dielectric Withstanding Voltage:
500 Vrms minimum at sea level
Corona Level:
125 Volts at 70K feet
Insertion Loss:
Dependant upon application
Insulation Resistance:
1000 Megohms minimum
Contact Resistance:
(milliohms maximum)
Initial After Environmental
Center Contact . . . 3.0
4.0
Outer Conductor. . 2.0
Not Applicable
RF Leakage:
Not Applicable
RF High Potential Withstanding Voltage:
335 Vrms minimum
at 4 and 7 MHz
Mating Engagement for SMA Series Thickwall
Plug Compatable with MIL-STD-348
MECHANICAL SPECIFICATIONS
Engagement Design:
MIL-STD-348, Series SMA
Durability:
500 Cycles minimum
Engagement/Disengagement Force:
2 inch-pounds maximum
Mating Torque:
7 to 10 inch-pounds
Contact Retention:
6 pounds minimum axial force, 4 in-oz minimum
radial torque
ENVIRONMENTAL SPECIFICATIONS
(Meets or Exceeds the Applicable Paragraph of MIL-PRF-39012)
Temperature Range:
-65°C to +165°C
Thermal Shock:
MIL-STD-202, Method 107, Condition B-Except
115°C High Temp
Corrosion:
MIL-STD-202, Method 101, Condition B
Shock:
MIL-STD-202, Method 213, Condition I
Vibration:
MIL-STD-202, Method 204, Condition D
Moisture Resistance:
MIL-STD-202, Method 106
Assembly Tool for End Launch Jack Receptacles
Hand tighten to 5 inch
pounds maximum torque
140-0000-973
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HIGH FREQUENCY SMA END LAUNCH CONNECTORS
Part Data
Jack Receptacle – PC Mount, Round Body
Coupling proof torque 8
inch pounds maximum
without support wrench
Freq Range
0-26.5 GHz
Gold Plated
142-0761-801
142-0761-821
High Frequency Substrate Thickness
.008 (0.20) - .014 (0.36)
.014 (0.36) - .020 (0.51)
“A”
“B”
“C”
.010 (0.25)
.015 (0.38)
.050 (1.27)
.067 (1.70)
.096 (2.44)
.113 (2.87)
Jack Receptacle – PC Mount, Square Body
Coupling proof torque 8
inch pounds maximum
without support wrench
Freq Range
0-26.5 GHz
Gold Plated
142-0761-811
142-0761-831
High Frequency Substrate Thickness
.008 (0.20) - .014 (0.36)
.014 (0.36) - .020 (0.51)
“A”
“B”
“C”
.010 (0.25)
.015 (0.38)
.050 (1.27)
.067 (1.70)
.096 (2.44)
.113 (2.87)
Jack Receptacle – PC Mount, Round Body with Thick Legs
Freq Range
0-26.5 GHz
Gold Plated
142-0761-881
142-0771-821
High Frequency Substrate Thickness
.008 (0.20) - .014 (0.36)
.014 (0.36) - .020 (0.51)
“A”
“B”
“C”
.010 (0.25)
.015 (0.38)
.050 (1.27)
.067 (1.70)
.096 (2.44)
.113 (2.87)
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