A.H. Systems AK-571-4 User manual

A.H. Systems AK-571-4 Horn Antenna Kit
AK-571-4
Horn Antenna Kit
Operation Manual
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A.H. Systems AK-571-4 Horn Antenna Kit
TABL OF CONT NTS
INTRODUCTION 3
G N RAL INFORMATION 4
OPTIONAL QUIPM NT 6
SP CIFICATIONS 8
FORMULAS 10
WARRANTY 11
MAINT NANC 12
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A.H. Systems AK-571-4 Horn Antenna Kit
INTRODUCTION
CONT NTS
Model Number Description
Frequency
Range
Antenna Factor
(dB/m)
SAS-571 Double Ridge Guide Horn Antenna 700 MHz – 18 GHz 22 to 45
SAS-574 Double Ridge Guide Horn Antenna 18 GHz – 40 GHz 40 to 41.5
Attenuation
SAC-18G-3 3 Meter High Frequency, Low-Loss
Cable
Up to 18 GHz 3.5 dB @ 18 GHz
SAC-40G-1.5 1.5 Meter High Frequency, Low-
Loss Cable
Up to 40 GHz 10.5 dB @ 40 GHz
TSC-571 Transit Storage Case
ADP-213 2.9mm(f) to 2.9mm(f)
ADP-203 SMA(m) to N(f) adapter
OPTIONAL EQUIPMENT
Gain / Attenuation
PAM-0118P High Frequency Preamplifier 20 MHz – 18 GHz 37 dB
SAC-18G-0.5 0.5 Meter High Frequency, Low-
Loss Cable
Up to 18 GHz 1.5 dB @ 18 GHz
PAM-1840 High Frequency Preamplifier 18 GHz – 40 GHz 20 dB Gain
SAC-40G-0.5 0.5 Meter High Frequency, Low-
Loss Cable
Up to 40 GHz 4.5 dB @ 40 GHz
TCC-510 Tripod Carrying Case
ATU-510 Antenna Tripod, wooden
A H-510 Azimuth and levation Head
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A.H. Systems AK-571-4 Horn Antenna Kit
G N RAL INFORMATION
INT ND D PURPOS S
This equipment is intended for general laboratory use in a wide variety of
industrial and scientific applications, and designed to be used in the
process of generating, controlling and measuring high levels of
electromagnetic Radio Frequency (RF) energy. It is the responsibility of the
user to assure that the device is operated in a location which will control the
radiated energy such that it will not cause injury and will not violate
regulatory levels of electromagnetic interference.
G N RAL D SCRIPTION
The AK-571-4 Horn Antenna kit is the newest member of A.H. Systems
family of antenna kits. This Antenna Kit provides a convenient solution for
increased frequency requirements from 700 MHz to 40 GHz. As
specifications include higher test frequency requirements so does the need
for an accurate antenna solution. ach antenna comes calibrated traceable
to NIST
Cables and an adapter are provided to connect each antenna to either a N
or SMA type connector on the receiver. Cable calibrations are supplied.
To help minimize any downtime the customer may be experiencing during
testing we provide next-day, on-time delivery.
ach antenna mounts directly to the tripod azimuth and elevation head. The
azimuth and elevation head allows the operator to vary the antenna azimuth
(direction) and to change the antenna polarity (vertical or horizontal).
To obtain the field strength of the signal being measured, the operator must
add the receiver reading in dBuV, the antenna factor in dB, and the cable
attenuation in dB. This yields the field strength in dBuV/m. Calibrations for
the -field antennas are supplied at appropriate spacing (1, 3, and 10
meter) to comply with various test specification requirements.
-FI LD ANT NNAS
SAS-571 Double Ridge Guide Horn Antenna 700MHz - 18 GHz
SAS-574 Double Ridge Guide Horn Antennas 18 GHz – 40 GHz
The SAS-574 horn antenna comes assembled and ready to use. The
SAS-571 antenna mounting bracket is attached to the antenna backwards
in order to fit in the carrying case. The bracket must be removed from the
antenna, turned over (so that the bracket leg faces away from the antenna),
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A.H. Systems AK-571-4 Horn Antenna Kit
and re-attached to the antenna. (The bracket is not needed for mounting if
the tripod being used has an Azimuth/ levation Head.)
Operation: Attach the antenna to the tripod azimuth and elevation head
through the hole on the antenna bottom or the hole in the mounting bracket.
The ridge guides determine the antenna polarity: for horizontal polarity they
should be parallel to the ground, for vertical polarity they should be
perpendicular to the ground. Connect a cable between the antenna
connector and the receiver. NOT : B SUR TO US A CABL RAT D
FOR HIGH FR QU NCY WH N OP RATING ABOV 5 GHz (for
example, the SAC-18G-3 or SAC-40G-1.5).
TRANSIT STORAG CAS S
TSC-571 Transit Storage Case
The antenna carrying case (TSC-571) prevents damage and loss of
antennas and optional preamplifiers when storing or transporting the
antenna kit. The case is constructed of lightweight and durable
polyethylene. ach case includes cutouts for the optional equipment listed
below. Two case keys are provided with the case.
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A.H. Systems AK-571-4 Horn Antenna Kit
OPTIONAL QUIPM NT
The AK-571 case comes with two additional cutouts for optional
preamplifiers. In order to improve overall system sensitivity, the following
equipment may be required:
PAM-0118P with an SAC-18G-0.5
PAM-1840 with an SAC-40G-0.5
PAM-0118P Preamplifier 20 MHz – 18 GHz
The preamplifier will increase the system sensitivity 37 dB and is
recommend for the SAS-571 Double Ridge Guide Horn Antenna. An
optional short length cable (SAC-18G-0.5), is required to connect the
preamplifier to any 50-ohm receiver or spectrum analyzer.
SAC-18G-0.5 Low-Loss Cable up to 18 GHz
The Low-Loss, High Frequency cable is recommend for connecting the
optional preamplifier to any 50-ohm receiver or spectrum analyzer. Our
Low-Loss High-Frequency flexible cables are the preferred choice over
standard cable types. With improved power handling, low VSWR, and high
frequency capabilities, the Low-Loss cables can be made to your specified
length and delivered in two days. The 1/2 meter SAC-18G-0.5 has a typical
attenuation of 1.0 dB at 18GHz.
PAM-1840 Preamplifier 18 GHz – 40 GHz
The preamplifier will increase the system sensitivity 20 dB and is
recommend for the SAS-574. An optional short length cable (SAC-40G-
0.5), is required to interconnect the preamplifier to any 50-ohm receiver or
spectrum analyzer.
SAC-40G-0.5 Low-Loss Cable up to 40 GHz
The Low-Loss, High Frequency cable is recommend for connecting the
optional preamplifier to any 50-ohm receiver or spectrum analyzer. Our
Low-Loss High-Frequency flexible cables are the preferred choice over
standard cable types. With improved power handling, low VSWR, and high
frequency capabilities, the Low-Loss cables can be made to your specified
length and delivered in two days. The 1/2 meter SAC-40G-0.5 has a typical
attenuation of 4.5 dB at 40GHz.
TRIPOD AND MOUNTING ADPT RS
ATU-510 Tripod
A H-510 Azimuth and levation Head
The azimuth and elevation head (A H-510) mounts to the tripod (ATU-510)
top and allows the antennas to be rotated 360 degrees and tilted between
horizontal and vertical polarization. The tripod and azimuth and elevation
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head come in their own carrying case. ach tripod leg is independently
adjustable in angle and length to facilitate antenna height setting. The tripod
legs have a rubber tip on one end for indoor or hard surface use, and a
metal spike on the other end for outdoor soft surface (such as dirt) use.
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Antenna Specifications
Frequency Range 700 MHz – 18 GHz
Antenna Factor 22 to 44 (dB/m)
Average Gain 12 dBi
Nominal VSWR 1.5:1 (50 ohms)
Average Beamwidth -48 deg.,
H-30 deg.
Max continuous power 300 W
Max Radiated Field 200 V/m
Connector Precision N-type(f)
Mounting Base ¼-20 Thread (f)
A.H. Systems AK-571-4 Horn Antenna Kit
SP CIFICATIONS
SAS-571
Description
The SAS-571 Double Ridge
Guide Horn Antenna is a
linearly polarized broadband
antenna covering the frequency range of 1 GHz to 18 GHz. With High gain, low
VSWR, an input power handling capability of 300 watts CW makes this horn
antenna an excellent choice for both immunity and emissions testing. The SAS-
571 Double Ridge Guide Horn Antenna is a must have for testing above 1 GHz.
This antenna is precision machined from aluminum and may be mounted either
horizontal or vertical polarization. A 1, 3 and 10 meter individual calibration is
included with purchase.
Physical Specifications
Length Width Height Weight
11 in.
(27.9 cm)
9.62 in.
(24.4 cm)
6.25 in.
(15.9 cm)
4 lbs.
(22 kg.)
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Antenna Specifications
Frequency Range 18 GHz – 40 GHz
Antenna Factor 40.3 to 41.1 (dB/m)
Average Gain 15 to 21.2 dBi
Nominal VSWR 1.5:1 (50 ohms)
Average Beamwidth 20 to 32 deg.,
Max continuous power 10 W
Max Radiated Field 150 V/m
Connector WRD-180 to 2.9mm (f)
Mounting Base ¼-20 Thread (f)
A.H. Systems AK-571-4 Horn Antenna Kit
SAS-574
Description
The SAS-574 Double Ridge Guide Horn Antenna is a linearly polarized
broadband antenna covering the frequency range of 18 GHz to 40 GHz. With High
gain, low VSWR, an input power handling capability of 150 watts CW makes this
horn antenna an excellent choice for both immunity and emissions testing. This
antenna is precision machined from aluminum and may be mounted either
horizontal or vertical polarization. A 1 meter individual calibration is include with
purchase.
Physical Specifications
Length Width Height Weight
3.4 in. 1.2 in. 1.6 in. 0.2 lbs.
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A.H. Systems AK-571-4 Horn Antenna Kit
(8.6 cm) (3 cm) (4.1 cm) (0.09 kg.)
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A.H. Systems AK-571-4 Horn Antenna Kit
ANT NNA FORMULAS AND CALCULATIONS
EMISSIONS TESTING
Individual calibration data for the log periodic antenna is supplied at appropriate
distances (3, and 10 meter) to comply with various emissions test requirements.
For emissions measurements, add antenna factor plus cable loss to receiver
reading in dBV to convert to field strength in dBV/meter.
Fiel Strength( BuV/m) = SA( BuV) + AF( B/m) + cable loss ( B)
SA = Spectrum Analyzer or Receiver voltage reading
AF = Antenna Correction Factor
CL = Cable Loss in dB
IMMUNITY TESTING
For Immunity measurements, the generated electric field strength can be
calculated by:
FS = Approximate Field Strength in (V/m)
P = Power in watts
g = Numeric Gain
d = Distance in meters
Common RF Relate Conversion Factors
BmW = BV - 107
The constant in the above equation is derived as follows. Power is related to voltage according to
Ohm's law. The Log10 function is used for relative (dB) scales, so applying the logarythm function to
Ohm's law, simplifying, and scaling by ten (for significant figures) yields:
P = V2 / R
10Log10[P] = 20Log10[V] - 10Log10[50]
Note, the resistance of 50 used above reflects that RF systems are matched to 50. Since RF
systems use decibels referenced from 1 mW, the corresponding voltage increase for every 1 mW
power increase can be calculated with another form of Ohm's law.
V = (PR)0.5 = 0.223 V = 223000 V
Given a resistance of 50and a power of 1 mW
20Log10[223000 V] = 107 dB
The logarythmic form of Ohm's law shown above is provided to describe why the log of the
corresponding voltage is multiplied by 20.
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BmW/m2 = BV/m - 115.8
The constant in this equation is derived following similar logic. First, consider the Poynting Vector
which relates the power density (W/m2) to the electric field strength (V/m) by the following equation.
P=| |2/
Where is the free space characteristic impedance equal to 120. Transforming this equation to
decibels and using the appropriate conversion factor to convert dBW/m2 to dBmW/m2 for power
density and dBV/m to dBV/m for the electric field, the constant becomes 115.8
BV/m = BV + AF
Where AF is the antenna factor of the antenna being used, provided by the antenna manufacturer or
a calibration that was performed within the last year.
V/m = 10{[( BuV/m)-120]/20}
Not much to this one, just plug away!
BA/m = BV/m - 51.5
To derive the constant for the above equation, simply convert the characteristic impedance of free
space to decibels, as shown below.
20Log10[120] = 51.5
A/m = 10{[( BuA/m)-120]/20}
As above, simply plug away.
BW/m2 = 10Log10[V/m - A/m]
A simple relation to calculate decibel-Watts per square meter.
BmW/m2 = BW/m2 + 30
The derivation for the constant in the above equation comes from the decibel equivalent of the factor
of 1000 used to convert W to mW and vice versa, as shown below.
10Log10[1000] = 30
BpT = BA/m + 2.0
In this equation, the constant 2.0 is derived as follows. The magnetic flux density, B in Teslas (T), is
related to the magnetic field strength, H in A/m, by the permeability of the medium in Henry's per
meter (H/m). For free space, the permeability is given as...
o = 4 x 10-7 H/m
Converting from T to pT and from A/m to A/m, and taking the Log, the constant becomes...
240 - 120 + 20Log10[4 x 10-7] = 2.0
dBpT = dBuV + dBpT/uV + Cable Loss
dBuV/m = dBpT + 49.5 dB
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WARRANTY INFORMATION
A.H. Systems Inc., warrants that our Antennas, Sensors and Probes will be free from
defects in materials and workmanship for a period of three (3) years. All other products
delivered under contract will be warranted for a period of two (2) years. Damage caused
by excessive signals at the product's input is not covered under the warranty. A.H.
Systems' obligation under this warranty shall be limited to repairing or replacing, F.O.B.
Chatsworth, California, each part of the product which is defective, provided that the
buyer gives A.H. Systems notice of such defect within the warranty period commencing
with the delivery of the product by A.H. Systems.
The remedy set forth herein shall be the only remedy available to the buyer, and in no
event shall A.H. Systems be liable for direct, indirect, incidental or consequential
damages.
This warranty shall not apply to any part of the product which, without fault of A.H.
Systems has been subject to alteration, failure caused by a part not supplied by A.H.
Systems, accident, fire or other casualty, negligence, misuse or normal wear of
materials.
xcept for the warranty set forth above, there are no other warranties, expressed or
implied, with respect to the condition of the product or it's suitability for the use intended
for them by the buyer.
For prompt service, please contact our service department for a Return Material
Authorization Number before shipping equipment back to us.
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A.H. Systems AK-571-4 Horn Antenna Kit
MAINT NANC
To ensure reliable and repeatable long-term performance, annual
re-calibration of your antennas, preamplifiers and current probes
by A.H. Systems experienced technicians is recommended. Our
staff can calibrate almost any type or brand of antenna.
For more information about our calibration services or to place an
order for antenna calibration visit our website at
http://www.AHSystems.com or call 1(818) 998-0223.
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