GORE Microwave/RF
Assemblies
™
Interconnect
Solutions
Summary
GORE
™
Microwave/RF Assemblies have proven performance
in major commercial, military, and space programs for over 30
years. These assemblies are small, flexible, and offer the security
of proven reliability. They are easy to handle, allow a variety of
interconnect options, facilitate routing, permit easy servicing, and
are extremely robust. That’s why Gore is the preferred choice of
major original equipment manufacturers when high performance
and high reliability are needed.
Cost Effective Flexibility
A single, flexible GORE
™
Microwave Assembly can replace several
semi-rigid assemblies of equal or shorter lengths. This means
fewer designs and no costly 3-D drawings or bending machines
are required. Installation time is reduced with “user friendly”
flexibility while risk of damage during installation is virtually
eliminated. Risk-free, quick installation makes these cables cost
effective.
Reliably maximize flexibility and performance
Features and Benefits
Features
Various standard connector
options (push-on/blindmate
and threaded)
Broad frequency range
(DC to 65 GHz)
Consistent products
Flexible
Low loss
Consistent frequency
response
Small bend radius
Shielding effectiveness
greater than 90 dB/ft
Small diameter cables
(as small as 0.047” nominal)
Benefits
Simple, reliable, proven
solutions for most applications
Single cable solution
Reliable performance
Ease of installation
Longer distance, higher
bandwidth
Low group delay
Ease of routing in tight spaces
Low crosstalk/noise pickup
Higher density options
High Reliability Equals Long-Term Savings
GORE
™
Microwave Cable Assemblies are manufactured to
the same high standards that differentiate all Gore products
worldwide. These assemblies offer proven solutions for low-
loss, high-density, wide-bandwidth interconnect needs. Gore’s
manufacturing facilities are ISO 9001 certified.
Gore’s reliability reduces downtime, increases installation
efficiency, and decreases troubleshooting requirements due
to interconnect failure. A wide variety of standard cable and
connector options are available to satisfy the interconnect needs
of most RF applications from DC to 65 GHz.
Typical Applications:
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ATE Systems
Evaluation Test Boards
Antenna Arrays
Backplane Interconnects
Beam Forming Networks
Clock Distribution
General Test Networks
LMDS Systems
Module-to-Module
OC192/OC768 Standard Interconnects
DWDM Systems
Advantages of Flexibility
GORE
™
Microwave Cable Assemblies are flexible, yet durable
enough to withstand the rigors of installation. With an inherently
flexible cable design, installation time is greatly reduced.
GORE
™
Microwave Cables are more practical than semi-rigid
cables. Semi-rigid cables can be formed, but are not flexible.
Manufacturers of semi-rigid cables typically recommend
limitations on the number of rebends. While semi-rigid cables
offer good stability, their mechanical properties make the cable
impractical or difficult to use for many applications. In the end,
the manufacturer’s recommendations are usually ignored at
installation, stability is degraded, and service life is greatly
shortened.
GORE
™
Microwave Cables outperform other flexible cables.
Traditionally-designed flexible cables require a large bend radius
to yield acceptable stability. The large bend radius and overall
cable stiffness make them difficult to use especially in small or
lightweight devices. When the cable is forced into a smaller bend
radius, performance degrades appreciably, service life is greatly
shortened, and devices may be damaged.
GORE Microwave Cable Assemblies provide all the benefits of
flexibility without sacrificing performance. Fewer designs and no
costly 3-D drawings make installation cost effective.
™
Interconnect solutions include GORE
™
RF Jumper Cable Assemblies and
High-Density Assemblies
Gore's ePTFE insulation with a low dielectric constant of 1.4
offers:
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•
•
Lower relative losses
Higher velocity of propagation (85% speed of light)
Lower capacitive loading
Higher cutoff frequencies (DC to 65 GHz)
Advantages of Tape-Wrapped ePTFE
Gore originated the use of microporous expanded polytetra-
fluoroethylene (ePTFE) for microwave cables. Through our deep
scientific understanding of fluoropolymers, the variability of
the ePTFE dielectric is reduced so our cables provide consistent
performance. Our tape wrapping process and quality control
eliminates concentricity concerns and ensures constant impedance
through the assembly.
Advantages of Helically-Wrapped Foil Shielding
Other traditionally-designed assemblies, such as RG-type, semi-
rigid, or solder-dipped round wire braid constructions, have some
pitfalls. For many years, RG-type cables served the industry as a
viable low-cost interconnect option. As modules become smaller
and more densely packed and frequencies continue to increase,
shielding effectiveness becomes more critical. RG constructions
rely on round wire braid as an outer conductor. At only 1 GHz, a
single braid layer can obtain shielding effectiveness of 40 dB.
Additional layers may provide better shielding but the cable
becomes increasingly more difficult to terminate and bend and
still permits significant energy leakage at higher frequencies.
Semi-rigid constructions theoretically offer better shielding
effectiveness, but any benefits are offset by the difficulties
encountered during installation. To fit in a 3-D setting or route
through a panel or deck, pre-bent assemblies often need to
be partially unbent. Tie-downs are necessary on longer runs to
prevent vibration stress and insulating sleeving may be required
to prevent shorting out exposed circuitry. During alignment,
connectors can be subjected to high stress resulting in poor
mating or damage.
Helically-wrapped foil is used as an outer conductor on all GORE
™
Microwave Coaxial Assemblies and provides consistent shielding
effectiveness even when flexed. The helically-wrapped foil “gives”
when the cable is flexed, thus avoiding the potentially damaging
translation of differential stresses that occur in semi-rigid and
solder-dipped round wire braid constructions. This flexibility
minimizes the risk of failure at the connector termination point.
the digital signal. Consequently, there is a relationship between
the pulses in the time domain and their resulting spectra in
frequency domain.
The shortest pulse in a data stream is a bit, which represents
one-half of the period of a sine wave when only considering the
fundamental frequency. A full period correlates to half a clock rate
or a full clock rate, depending on the system. From this it can be
stated that the highest sine wave frequency in gigahertz equals
half the data rate in gigabits per second. Lower frequencies will
exist representing the longer bits.
Some bandwidth-limited systems operate in just this fashion. If
greater precision is required, more frequencies are added to the
basic sine wave. A rectangular pulse can be shown to consist of
a series of harmonics of the fundamental. These harmonics add
definition to the rise and fall times of each pulse beyond the
base half-sine wave. Adding just the third harmonic improves the
waveform shape and is generally more than adequate to achieve
the desired power or voltage transmission necessary for accurate
receiver triggering.
GORE
™
Microwave Cables are well-suited for digital signal
transmission. The signal’s velocity of propagation remains
constant over a wide range of frequencies because of the
consistency of the cable dielectric. The series of harmonics
defining the square wave can be transmitted over the cable with
minimum distortion.
GORE
™
Microwave Cables offer:
• Lower relative loss for cleaner eye patterns
• Low VSWR minimizing reflections
• Consistent response with frequency for lower group delay
shielding Effectiveness
Test method MIL-STD-1344, Method 3008
The graph shows the typical shielding performance for four di erent coax
cable types. Each type di ers only in the construction of the cable’s outer
shield. As shown, a GORE™ Microwave Cable provides signi cantly better
shielding than braiding or aluminized mylar approaches because of the
helically-wrapped foil outer shield.
GORE
™
Microwave Cables provide a minimum of 90 dB/ft of
shielding effectiveness across the entire microwave frequency
range through 18 GHz and beyond; by eliminating any openings
for leakage in the cable, assembly shielding effectiveness is
limited only by connector selection and not by the cable.
Capabilities
Gore offers standard, reliable assembly solutions from DC through
65 GHz. Various standard push-on/blindmate and threaded
connector options are available to mate with virtually any system.
As the necessity for increased frequency and bandwidth drive
your application needs, Gore’s interconnects provide solutions.
In addition to standard interconnects, Gore offers precision test
assemblies and adapters to meet all of your high data rate digital
and microwave needs.
If you need other configurations, please contact Gore to discuss
your requirements.
Digital vs. Microwave
As data rates in sophisticated digital equipment increase, the
worlds of microwave and digital system designers are coming
together. Traditional twisted pair, twin-ax, or tri-axial solutions
cannot support the higher data rates so designers are turning to
RF solutions.
A simple digital on-off keying, a 0-1-0 square wave sequence, can
be modeled as a series of discrete sinusoidal frequencies. These
frequencies are related to pulsewidth and rise and fall times of
GORE
™
RF Jumper Assemblies
GORE
™
RF Jumper Assemblies provide a reliable solution for
microwave interconnect needs and offer several advantages.
High density packages require a robust user-friendly microwave
interconnect with consistent performance. GORE
™
RF Jumper
Assemblies are designed utilizing world class engineering and
manufacturing techniques to provide cost effective solutions for
device internal applications. GORE
™
RF Jumper Assemblies use
low profile SMA pins on both ends for compatibility with most
standard systems. The SMA pin connector mates with SMA,
3.5 mm, and 2.92 mm socket connectors.
Features and Benefits
Features
Extremely flexible cable
Small bend radius
Low springback
Low connector profile
Shielding effectiveness
greater than 90 dB/ft
Consistent connector
components
Built using statistical process
control
SMA-to-SMA configuration
Benefits
Ease of installation
Ease of routing
Ease of installation
Fits easier in tight areas
Low crosstalk and noise pickup
Stable connector interface
Constant cable-to-cable
performance
Compatible with most devices
GORE
™
RF Jumper Assemblies are available in a variety of lengths
The small bend radius makes these assemblies easier to route
in tight spaces and a cable bend radius as small as 0.40 in (10.2
mm) is achieved with no degradation in electrical performance.
Unlike stiff semi-rigid cables, GORE
™
RF Jumper Assemblies allow
connection/disconnection at one end enabling access to system
components; this makes them ideal for sytems with multiple
assemblies and limited space.
Flexibility
High flexibility allows shock and vibration to be absorbed and not
transferred. This flexible design plus an engineered strain relief
make GORE
™
RF Jumper Assemblies a highly reliable interconnect
solution.
High Performance with Low Hassle
Gore's proven shielding techniques provide superior noise
immunity of greater than 90 dB at 18 GHz. The high-performance
ePTFE dielectric provides low attenuation. Typical attenuation at
18 GHz is less than 0.35 dB/ft for 195 cable and 0.52 dB/ft for
145 cable.
12 in (304.8 mm)
0.33
0.41
0.57
0.70
0.89
0.25
0.31
0.43
0.54
0.68
24 in (609.6 mm)
36 in (914.4 mm)
Maximum Insertion Loss (dB)
O.D.
0.145 in
(3.7 mm)
Freq. (GHz)
2
4
8
12
18
0.195 in
(4.9 mm)
2
4
8
12
18
6 in (152.4 mm)
0.23
0.28
0.38
0.47
0.59
0.19
0.23
0.31
0.39
0.49
0.51
0.67
0.95
1.17
1.47
0.38
0.48
0.68
0.84
1.06
0.70
0.93
1.33
1.64
2.05
0.50
0.65
0.92
1.15
1.44
Low Profile Connectors Fit Tight
Packaging Constraints
Gore's low profile SMA connectors reduce stress at the cable/
connector junction where most failures occur and, with a cable
bend radius as small as 0.40 in (10.2 mm), are easy to install in
tight areas.
Selecting a Part Number
GORE
™
RF Jumper Assembly part numbers consist of seven
numeric characters. The grouping of these characters has a
specific meaning (see illustration below). Follow these guidelines
to determine the part number:
1. Characters 1-3 define the desired cable diameter. To select
the 0.195” (4.9 mm) O.D. cable, use 195 as the first three
characters. To select the 0.145” (3.7 mm) O.D. cable, use 145
as the first three characters.
2. Characters 4-6 define the cable assembly length in inches.
Lengths which require only one or two digits (e.g., 6 or 24 in)
should be preceded by zeros in the unused positions (e.g.,
006, 024).
Character 7 is used to further define lengths which are not
whole-inch increments (e.g., 24.5 in). If the length is a whole-
inch increment, Character 7 should be zero.
Example: For a 7.5” assembly using 0.195” diameter cable, the
Gore part number is 195-007.5
Unique Captivation in a Standard SMA
GORE
™
RF Jumper Assemblies utilize SMA pin connectors for
compatibility with most systems. Engineered contact captivation
features and materials that keep the pin and insulator tolerance
in specification enhance connector performance, even in
demanding environments.
These designs survive temperature cycling from -55°C to 125°C
and can be flexed without any movement at the interface.
GORE
™
RF Jumper Assembly Quality Guarantee
Utilizing the latest Statistical Process Control (SPC) techniques,
Gore guarantees the stated physical and electrical performance
specifications of each GORE
™
RF Jumper Assembly.
1 2 3 - 4 5 6 . 7
Cable Type
Assembly Length
in Inches
Cable Specifications
Cable Type 145
Outer Diameter (nom.)
Connectors
Connector Interface
Temperature Range
Cable MIL Spec
Weight
Single Bend Radius
Frequency Range
VSWR
Shielding
Impedance
Vp
Center Conductor (SPC)
0.145 in (3.7 mm)
SMA Pin
Per MIL-C-39012
-55°C to 125°C
Per MIL-C-17
11 g/ft (36.3 g/m)
0.40 in (10.2 mm)
DC to 18 GHz
< 1.35:1 up to 18 GHz
> 90 dB up to 18 GHz
50 Ohm ±1 Ohm
85%
Solid
Cable Type 195
0.195 in (4.9 mm)
SMA Pin
Per MIL-C-39012
-55°C to 125°C
Per MIL-C-17
16 g/ft (52.8 g/m)
0.50 in (12.7 mm)
DC to 18 GHz
< 1.35:1 up to 18 GHz
> 90 dB up to 18 GHz
50 Ohm ±1 Ohm
85%
Solid
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