compact log periodic antenna
TRANSCRIPT
DescriptionThe ALC-100 is a broadband, linearly polarized Log Periodic Dipole Array (LPDA) Antenna, operating over the frequency range of 200 MHz to 1 GHz; and with excellent efficiency between 300 MHz and 1 GHz. This antenna is a compact version of the AL-100, in that the overall length of the antenna has been reduced by over 13 inches, with only a slight compromise in overall performance.
ConstructionThe construction of the ALC-100 is identical to that of the AL-100 Log Periodic, in that it has been designed to be extremely durable, making it an ideal choice for daily use in laboratory environments, both indoors and outdoors, and even under continuous exposure to extreme weather conditions. The antenna elements are solid stainless steel, and the “feeder tubes” are constructed from the same heavy guage, corrosion resistant aluminum.
Com-Power Corporation 19121 El Toro Rd., Silverado, California 92676 (949) 459-9600 www.com-power.comRev. D10.15
ApplicationThe ALC-100 Compact Log Periodic Antenna is intended for use as an EMI test antenna for qualification-level regulatory compliance measurements (FCC, CE, RTCA DO-160, FDA, SAE Automotive, etc.). The ALC-100 can also be used in conjunction with an RF power amplifier (up to 50 watts) to generate RF fields associated with RF immunity tests. For high power applications, Com-Power’s ALP-100 Power Log Periodic Antenna is an excellent choice.In addition, a pair of ALC-100 Compact Log Periodic Antennas can be used in lieu of dipole antennas for Normalized Site Attenuation (NSA) calibrations of Open Area Test Sites (OATS) or Semi-Anechoic Chambers (SAC); thereby avoiding the time-consuming process of tuning the dipole element lengths at each discrete frequency. Notwithstanding the above applications, the ALC-100 can also be used for site comparisons, shielding effectiveness tests of enclosures, field monitoring, site surveys and other general purposes.
MountingThe mounting assembly for the the ALC-100 incorporates a hinge mechanism to quickly and easily change the antenna polarization. The assembly is equipped with a standard 1/4-inch x 20 mounting hole, which allows it to be affixed to Com-Power’s AT-812 Antenna Tripod, AM-400 Antenna Mast, or any other similar structure with compatible mounting arrangements.
Features • Frequency Range
300 MHz to 1 GHz (useable from 200 MHz)
• Transmit & Receive Capabilities emissions/immunity applications
• Individual Calibration Included per ANSI C63.5 with NIST traceability
• Three-year Standard Warranty
CalibrationEach antenna is individually calibrated per ANSI C63.5 with NIST traceability. The calibration data and certificate is provided. Recognized ISO 17025 accredited calibration is also available upon request.
(W)5.1"
(H)21.5"
(D) 25.5"
Compact Log Periodic AntennaALC-100
Com-Power Corporation 19121 El Toro Rd., Silverado, California 92676 (949) 459-9600 www.com-power.comRev. D10.15
Specifications
All specifications are subject to change without notice. All values are typical, unless specified.
Typical Field Strength with 50W Input Power
Product Name Compact Log Periodic Antenna
Frequency Range 300 MHz to 1 GHz (useable from 200 MHz)
Polarization Linear
Nominal Impedance 50Ω
Power Handling 50 Watts (continuous)
Connector N-type (female)
Antenna Factor 13.3 to 23.2 (average: 19.3) [dB(m-1)]
Isotropic Gain 2.1 to 7.8 (average: 6.6) dBi
VSWR 1.05 to 2.52 (average: 1.57) :1
Return Loss 7.3 to 31.0 (average: 16.4) dB
Radiated Field Strength see graph below
Specifications FCC, CISPR, EN, ETSI, FAA, MIL-STD-461, SAE, etc.
Dimensions (H x W x D) 21.5” x 5.1” x 25.5” [54.6 x 13 x 64.8 cm]
Weight 2 lbs. [0.9 kg]
PAM-103 Preamplifier
AT-812 Antenna Tripod
Also Available:AB-900 Biconical Antenna
AM-741 Active Monopole AntennaALP-100 & AL-100 Log Periodic Antennas
Accessories availablefrom Com-Power:
SPA-800 Spectrum Analyzer
1
10
100
200 300 400 500 600 700 800 900 1000Frequency (MHz)
Field
Str
engt
h (V
/m)
3 meters
1 meter
Ant. Input (W) * 30 * [numeric] Gain
Test Distance (m)Field Strength (V/m)
Typical Forward Power Levels
0.01
0.1
1
10
100
200 300 400 500 600 700 800 900 1000Frequency (MHz)
Forw
ard
Pow
er (W
atts
)
3 V/m @ 3m
3 V/m @ 1m
Field Strength (V/m)2 * Test Distance (m)2
30 * [numeric] Isotropic Antenna GainForward Power (Watts) =
Voltage Standing Wave Ratio (VSWR)
1
10
200 300 400 500 600 700 800 900 1000Frequency (MHz)
VSW
R (x
:1)
ALC-100 Compact Log Periodic AntennaALC-100 with 4 dB Impedance Matching PadALC-100 with 2 dB Impedance Matching Pad
Return Loss
1
10
100
200 300 400 500 600 700 800 900 1000Frequency (MHz)
Retu
rn Lo
ss (d
B)
ALC-100 Compact Log Periodic AntennaALC-100 with 4 dB Impedance Matching PadALC-100 with 2 dB Impedance Matching Pad
Antenna Factors / Isotropic Gain
10
20
30
40
50
200 300 400 500 600 700 800 900 1000
Frequency (MHz)
Ante
nna F
acto
r [dB
(m-1
)]
-25
-15
-5
5
15
Isotropic Gain (dBi)
1 meter
10 meters
1 meter
10 meters
-3 dB [Half-Power] Beamwidth
0
100
200
300
200 300 400 500 600 700 800 900 1000
Frequency (MHz)
-3 d
B Be
amw
idth
(deg
rees
)
H-Plane
E-Plane
Compact Log Periodic AntennaALC-100