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MegaPhase® 67 GHz Test Cables
VNA Test Port Extension Cables
MegaPhase’s industry-leading test cables have been
optimized for consistent and repeatable performance through
67 GHz. These phase and amplitude stable test cables feature
1.85mm connectors, including connectors that mate directly
with 1.85mm VNA ports.
MegaPhase® 67 GHz test cable products are built-to-order with any
combination of 1.85mm connectors, including our Factory Formed
right angles. Available in lengths from 8 to 72in (20 to 183cm).
GHz
Attenuation
(dB/ft)
÷ 2.75
GHz
Frequency
(GHz)
Band
VSWR
(x.xx:1)
0.3 VHF 1.02 0.08 0.27 0.02
1.0 UHF 1.05 0.12 0.39 0.02
2.0 L 1.10 0.17 0.57 0.03
4.0 S 1.15 0.26 0.86 0.04
8.0 C 1.20 0.40 1.31 0.07
12.4 X 1.25 0.53 1.74 0.08
18.0 Ku 1.27 0.69 2.26 0.11
20.0 Ku 1.30 0.74 2.44 0.12
26.5 K 1.35 0.91 2.99 0.15
34.0 Ka 1.40 1.05 3.43 0.18
40.0 Ka 1.45 1.24 4.06 0.25
50.0 V 1.50 1.47 4.82 0.32
60.0 V 1.55 1.81 5.94 0.39
67.0 V 1.60 2.05 6.73 0.45
Impedance
Operating Temperature Range
Phase Stability
Insertion Loss (Amplitude) Stability
50 Ω nominal
-65°C through +100°C (Increased Range Available)
θ° = F
dB = 0.01 × F
Phase Matching Available
Finished Diameter, nominal
TM67 - 0.285in (7.24mm) VN67 - 0.625in (15.88mm)
TM67
Attenuation
(dB/m)
VN67
Connector
Loss
(dB/ea)
Document Name: MegaPhase 67 GHz Test Cables (09.09.04).doc
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Last printed 4/6/2005 11:28 AM
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PRODUCT FEATURE
65 GHZ
VNA
T
EST
PORT
EXTENSION CABLES
M
ost VNA measurements require the
use of extension cables as part of the
test set-up. Measurement accuracy
can be severely degraded if these cables are
not stable over time and flexure. Thus, the
choice of measurement cables is as important
as the instrument itself. The MegaPhaseVN
series are test port extension cables optimized
for vector network analyzer equipment, scalar
analyzers and probe stations operating at frequencies up to 65 GHz. In addition to their
optimized electrical and mechanical performance they are typically priced at a fraction of
OEM test cables.
In most precision test applications, cables
are constantly moved with repetitive flexures.
Traditional coaxial cables use braid/foil outer
conductors. Repetitive flexure causes the
braid and foil strands to deform, thereby
changing the impedance and compromising
the phase stability of the cable. In contrast,
MegaPhase GrooveTubeVN technology
maintains its geometry over the full life of the
cable, which permits consistent measurement
accuracy from out-of-the-box through
100,000+ flexures. GrooveTube cables feature
a corrugated copper outer conductor, manufactured by helically wrapping the copper
tape directly over the PTFE dielectric core
instead of the traditional braid/foil outer conductor. This results in better accuracy with
fewer recalibrations. This improved electrical
and mechanical stability over time combined
with its lower initial cost results in the Lowest
Cost Per Measurement.™ The VN test cables
are housed inside of a crush-, torque- and
pull-resistant armor that further enhances the
cable’s useful life.
The electrical and mechanical data for the
VN series are shown in Table 1. The nominal
MEGAPHASE LLC
Stroudsburg, PA
TABLE I
VN SERIES DATA
Electrical Data
Max frequency 67 GHz
Impedance 50 Ω nominal
Velocity of propagation 69 % nominal
Time delay 1.47 Ns/ft (4.82 Ns/m)
Capacitance 29.0 pF/ft (95.1 pF/m)
Mechanical Data
Jacketed outer diameter 0.625" (15.9 mm)
Outer jacket type PET braid
Ruggedization metal braid over metal armor
Minimum bend radius 1.5" (38.1 mm)
Operating temperature –76° to 347°F (–60° to 175°C)
Weight 0.175 lbs/ft (0.26 kg/m)
Inner conductor solid Ag-placed Cu
Dielectric PTFE
Outer conductor Cu GrooveTube
®
Reprinted with permission of MICROWAVE JOURNAL®from the March 2004 issue.
©
2004 Horizon House Publications, Inc.
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PRODUCT FEATURE
impedance is 50 Ω with a time delay
of 1.47 ns/ft. The 0.625" diameter cable has a minimum bend radius of
1.5". The attenuation, connector loss
and VSWR for seven different part
numbers are shown in Table 2 for
frequency ranges from 500 MHz to
65 GHz. The phase and amplitude
stability versus flexure for a 360° turn
around 4" mandrel is shown in Table
3 for 18 to 65 GHz, while the phase
change during movement and recovery from DC to 40 GHz is illustrated
in Figure 1. Figure 2 is a similar
plot of amplitude change.
Ruggedized port connectors that
connect directly to the VNA port are
available in 1.85 mm, 2.4 mm, 2.92
mm and 3.5 mm. Other available connector types are N, SMA, TNC and 7
mm, as well as custom designs. All the
VN cable assemblies are manufactured
to order with a standard two-week
lead-time, including odd combinations
such as 2.4 mm to Type SC. Because
of the modular mechanical design, the
VN series cables are repairable. All
MegaPhase VN cables are backed by a
six-month unconditional warranty.
MegaPhase LLC,
Stroudsburg, PA (570) 424-8400
or (877)-MEGAPHASE,
(877) 634-2742,
www.MegaPhase.com.
TABLE II
VN SERIES TYPICAL INSERTION LOSS (dB)
Frequency Part Attenuation Connector
(GHz)
Band
No. (dB/ft) (dB/m) Loss (dB)
SWR
0.512 UHF VN4 0.08 0.27 0.02 1.04
0.900 UHF VN4 0.11 0.36 0.02 1.05
1.000 L VN4 0.12 0.39 0.02 1.05
1.900 L VN4 0.17 0.56 0.03 1.10
2.000 S VN4 0.17 0.57 0.03 1.10
3.000 S VN4 0.22 0.73 0.04 1.10
4.000 C VN4 0.26 0.86 0.04 1.15
6.000 C VN8 0.34 1.10 0.06 1.15
8.000 X VN8 0.40 1.31 0.07 1.20
10.000 X VN18 0.46 1.50 0.08 1.25
12.400 X VN18 0.53 1.74 0.08 1.25
14.000 Ku VN18 0.58 1.89 0.09 1.30
18.000 Ku VN18 0.69 2.26 0.11 1.30
20.000 K VN26 0.74 2.44 0.12 1.30
22.000 K VN26 0.79 2.61 0.13 1.30
26.500 K VN26 0.91 2.99 0.15 1.35
28.000 Ka VN40 0.95 3.11 0.16 1.40
30.000 Ka VN40 1.00 3.27 0.17 1.40
32.000 Ka VN40 1.05 3.43 0.18 1.40
38.000 Ka VN40 1.19 3.90 0.22 1.45
40.000 Ka VN40 1.24 4.06 0.25 1.45
50.000 V VN50 1.47 4.82 0.32 1.50
60.000 V VN65 1.90 6.23 0.37 1.60
65.000 V VN65 2.00 6.56 0.40 1.65
TABLE III
PHASE AND AMPLITUDE
STABILITY vs. FLEXURE (360° AROUND A 4" MANDREL)
Frequency Phase Amplitude
(GHz) (°) (dB)
18.0 2.5 0.05
26.5 3.0 0.07
40.0 7.0 0.20
50.0 8.0 0.50
60.0 10.0 0.62
65.0 12.0 0.70
8
6
4
2
0
−2
−4
−6
−8
403020
FREQUENCY (GHz)
RECOVERY MOVEMENT
10DC
PHASE DEVIATION (°)
▲ Fig. 1 Phase deviation
during movement and recovery.
0.20
0.10
0
−0.10
−0.20
403020
FREQUENCY (GHz)
10DC
AMPLITUDE
DEVIATION (dB)
RECOVERY MOVEMENT
▲ Fig. 2 Amplitude change during
movement and recovery.
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