ORBIT FR Magnetic dipoles User Manual
REFERENCE ANTENNAS
>
Magnetic Dipoles
Typical 3D radiation pattern
The magnetic dipole or magnetic
loop antenna is complementary
to the electrical dipole, with a
similar radiation pattern but in
orthogonal polarization.
REFERENCE ANTENNAS
> Main use:
• Gain reference
• Effi ciency reference
• Chamber refl ectivity evaluation: directivity,
cross polarization and radiation pattern
> Delivered documents:
• Typical performance data (TYMEDATM)
•
Measured return loss data
> Surface treatment:
• Alodine 1200 according to MIL-C 5541E class 3
• Blue paint
> Related certifi cation:
• CTIA low gain antenna measurement
> Related services:
• Calibration and maintenance
•
Customization
➊ TECHNICAL PERFORMANCE
• Low loss and high effi ciency
• Azimuth pattern symmetry is within ± 0.1 dB
variation as specifi ed by the CTIA for ripple
testing according to the OTA Test Plan
➋ DESIGN
• Innovative low loss structure with a protective
external radome
• Excellent rotation symmetrical structure
minimizing cross polarization level
• The radiating structure is orthogonal to the feeding
line, minimizing cable and feed point interaction
• The radiating structure is entirely metallic without
the use of external discrete components
• Innovative choke design further reduces cable
interaction by attenuating the natural return
currents from the magnetic dipole
➌ REPEATABILITY
• Stiff and robust mechanical design
• Precision machined
• High reliability connector
18
MD Typical elevation and azimuth radiation pattern
Electrical characteristics
Part number MD
Type of antenna Magnetic dipole
Available frequencies 0.65 – 5.5 GHz
Gain variation over azimuth <± 0.1 dB
Peak directivity 2.1 dBi (Typ)
Peak gain 1.6 dBi (Typ)
Effi ciency
VSWR
Return loss
Cross polar level < 20 dB
Impedance 50 Ohms
Frequency BW (Ret. Loss <-10 dB) 5 % (Typ)
(1) at the labeled center frequency
(1)
~ 88 % (Typ)
(1)
1.9:1
(1)
< -10 dB
Mechanical drawing
“A”
“B”
“C”
“D”
Connector type & interface
Type 23 PC35-50-0-51/199 UE
1.6
(.063)
13.3
(.524)
“d”
> Measurement antennas
1/4-36 UNS-2A
19
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