1055497-1 Datasheet, PDF (16/320 Pages) Tyco Electronics – RF Coax Products

RF Coax Connectors
λ/4 Stub Tuners
Product Facts
■ Ideal for use with GSM,
PCS and DCS
■ Maintenance Free Operation
■ Low VSWR Within Specified
Bandwidth
■ Configurations include
direct attachments to Cable
variants
■ Optional White Bronze
Finish
Advantages
■ Low VSWR in pass-
band
■ Minimal maintenance
■ Pass-through voltage
eliminated
■ No sparkover or resid-
ual voltage concerns
■ Ease of retro-fitting
antenna sights
Limitations
■ Frequency specific
■ Harmonic passband
■ Does not allow DC bias
on transmission line
These devices are three port
coaxial connectors. The third
port extending from the main
through path is terminated in
a short circuit at a pre-deter-
mined distance calculated to
be exactly one quarter wave-
length at the desired center
frequency (see graph).
Unlike surge protectors, this
design eliminates concerns
about residual pulse,
sparkover voltage and resid-
ual voltage ensuring greater
protection for sensitive
electronic equipment. As
opposed to surge protec-
tors, stub tuners will absorb
lightning strikes without
need for replacing compo-
nents. These devices yield
very low VSWR and feature
high attenuation within a rel-
atively narrow pass-band
(+/- 70 MHz) but are appli-
cation specific. Stub tuners
also pass energy in bands
that are harmonically related
to the fundamental center
frequency. The graphs
below show a typical test
impulse and the response of
a stub tuner.
λ/4 Shorting Stub Basics
li
Vi
Vr
lr
Stub tuners are classified
into two broad categories—
simple and broadband. The
simple stub tuner exhibits a
V-shaped response on the
VSWR vs. frequency plot.
The trough of the V is
designed to occur at the
required Fo and the band-
width is restricted to approx-
imately 8%. The broadband
tuner employs extra RF tech-
niques, similar to multiple
cavity filtering, which
increase the effective band-
width by approximately 20%.
Tyco Electronics offers a
wide variety of stub tuners
for the most popular fre-
quency bands to facilitate
purchase without need for
custom design and manu-
facturing. Designs exist for
GSM, PCS 1900, DCS 1800
Typical λ/4 Test Response
frequencies with standard
industry interfaces includ-
ing SMA, 7-16, and Type N.
Configurations include
cable assemblies, cabled
connectors, and adapters
for ease of assimilation into
existing systems. Stub
tuners are maintenance free
since they incorporate no
active components though
it is recommended that a
check of the stub tuner
affixment be made following
heavy discharges at an
installation.
Typical Test Impulse
V
1.0
1.9
0.5
0.3
0
01 _T
T1
T2
t
T1 = 1.67T
326.400 110.308
V
kA
244.800 94.5588
V
kA
163.200 78.8088
V
kA
81.6000 63.0588
V
kA
0.0 47.3088
uV
kA
-81.600 31.5588
V
kA
-163.20 15.8088
V
kA
-244.80 58.80
V
A
-326.40 -15.691
V
kA
-640.0nS, 80.033280 V
10.98uS, 49.45920kA
0.0nS
0.0nS
20.00uS
20.00uS
40.00uS
40.00uS
60.00uS
60.00uS
80.00uS
80.00uS
16
Catalog 1307191
Revised 3-07
www.tycoelectronics.com
Dimensions are in millimeters
and inches unless otherwise
specified. Values in brackets
are standard equivalents.
Dimensions are shown for
reference purposes only.
Specifications subject
to change.
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-1106-0803
South America: 55-11-2103-6000
Hong Kong: 852-2735-1628
Japan: 81-44-844-8013
UK: 44-8706-080-208