AntennaCalibraon& - loco.lab.asu.edu fileFarfield&radial&distance& • D: maximum dimension of...
Transcript of AntennaCalibraon& - loco.lab.asu.edu fileFarfield&radial&distance& • D: maximum dimension of...
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Antenna Calibra,on for BicoLOG 5070 Biconical Antenna
Prepared by Jose Chavez 2013 Apr 07
LoCo Research Group
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Tenta,ve Setup Comb generator LPF Amp bicoLOG
LPF Amp Spectrum Analyzer
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Farfield radial distance • D: maximum
dimension of transmitting antenna
• λ: operating wavelength of transmitting antenna
• (top) general equation • (bottom) equation for
electrically small antennas, like short dipole and small loops.
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Rff for bicoLOG antenna
*Distance is too large for the lab. *Might be able to use larger frequency (80 MHz), smaller wavelength. *Lab setup was 25”(7.62m)
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Radio Link (Friis)
• Pt: radiated power by transmitting antenna • Pr: received power by antenna • Gt: gain of transmitting antenna • Gr: gain of receiving antenna • λ: transmitting antenna operating wavelength • R: radial distance from transmitting antenna
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We need approximately a 50 db amplifica,on.
If we want receiving antenna to get a -‐30dBm signal, solve for Pt and set Pr to be 0.001 mW. (Used linear gain, 80MHz)
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Setup Comb generator (200 mW)
LPF (SLP-‐200+)
Amps (ZX60-‐601E-‐S+, 16 dB each) bicoLOG 5070
LPF (6LC-‐190-‐S) Amp
Spectrum Analyzer
(12.3 V, 120 mA)=1.44 W
(12.01 V, 40 mA) =0.48 W
R&S HK033
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Setup (Transmiing)
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Setup (Receiving)
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Sweeps
-‐90
-‐80
-‐70
-‐60
-‐50
-‐40
-‐30
-‐20
-‐10
0 80 100 120 140 160 180 200 220 240 260
Power (d
Bm)
Frequency (MHz)
Upright (off)
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Sweeps
-‐100
-‐90
-‐80
-‐70
-‐60
-‐50
-‐40
-‐30
-‐20
-‐10
0 80 100 120 140 160 180 200 220 240 260
Power (d
Bm)
Frquency (MHz)
Upright (on)