ohnson
J
®
High Frequency
End Launch Connectors
Emerson Network Power
Connectivity Solutions
™
E M E R S O N. C O N S I D E R I T S O LV E D
.
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
Typical Return Loss
Measured on 50 ohm GCPW fabricated on Rogers® RO-4003™ substrate
142-0761-811 (8 mil substrate)
VSWR = 1.05+.02F(GHz)
-10
142-0761-871 (16 mil substrate)
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).
S11 (dB)
-20
-30
-40
“PATENT PENDING”
-50
0
5
10
Frequency (GHz)
15
20
25
30
2
Emerson Network Power • Tel: 800.247.8256 • Fax 507.833.6287 • www.EmersonNetworkPower.com/connectivity
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 cen-
ter contact is mechanically captivated and optimized to maintain proper impedance while with-
standing 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 effec-
tively 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 cir-
cuit 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.
Emerson Network Power • Tel: 800.247.8256 • Fax 507.833.6287 • www.EmersonNetworkPower.com/connectivity
3
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
After Environmental
Contact Resistance:
(milliohms maximum) Initial
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
4
Emerson Network Power • Tel: 800.247.8256 • Fax 507.833.6287 • www.EmersonNetworkPower.com/connectivity
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”
.010 (0.25)
.015 (0.38)
“B”
.050 (1.27)
.067 (1.70)
“C”
.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”
.010 (0.25)
.015 (0.38)
“B”
.050 (1.27)
.067 (1.70)
“C”
.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”
.010 (0.25)
.015 (0.38)
“B”
.050 (1.27)
.067 (1.70)
“C”
.096 (2.44)
.113 (2.87)
Emerson Network Power • Tel: 800.247.8256 • Fax 507.833.6287 • www.EmersonNetworkPower.com/connectivity
5
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