isolation measurements -...
TRANSCRIPT
Isolation measurementsOctober 2018
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Iso
lati
on
(d
B)
Frequency (MHz)
front
left
right
back
Isolation is measured with Ethernet and USB cables connected
through octoBox data filters.
Isolation is measured at close proximity and improves drastically with
a foot or two of extra distance
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octoBox isolation measurements
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Isolation test setup
Equipment and antenna specificationshttp://www.octoscope.com/English/Products/Ordering/index.html
https://www.dsinstruments.com/store/products/12ghz-rf-signal-generator-usb-ethernet-oled/
http://www.testequipmenthq.com/datasheets/ADVANTEST-R3267-Datasheet.pdf
http://www.minicircuits.com/pdfs/ZX60-V63+.pdf
http://www.minicircuits.com/pdfs/ZX60-V82+.pdf
http://www.wa5vjb.com/pcb-pdfs/LP8565.pdf
https://www.dropbox.com/home/octoScope%20Team%20F
older/octoBox_docs/datasheets?preview=octoBox_OBS-
14_OBS-15_High-Gain_Antenna_Datasheet.pdf
Spectrum Analyzer
Advantest R3267
Log-Periodic
Antenna Kent
LP8565
Amplifier
Mini-Circuits
ZX60-V63+
Log-Periodic
Antenna
Amplifier
Mini-Circuits
ZX60-V82+
12GHz Signal
generator
Laptop
octoBox under test USB
PWR
ETH
We used three different kinds of antenna pairs for the octoBox isolation test.
700 -1900 MHz, we used Kent LP8565.
2000 - 5900 MHz, we used the octoScope OBS-14.
6000 - 8000 MHz, we used the octoScope OBS-15.
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1. Take a reference measurement with
the octoBox door open and with TX
and RX antennas in close proximity.
2. Close the octoBox door and perform
measurements at different
orientations of octoBox with respect
to RX antenna, which is connected to
the Spectrum Analyzer.
3. Record and plot the
measurements for each
orientation.
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Test procedure Reference measurementTX antenna
RX antenna
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Spectrum Analyzer measurement at new honeycomb vent
Power
Amp
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Isolation measurement at filter Inputs
RX antenna
connected to
Spectrum Analyzer
Ethernet and USB
cables connected
through a dual
Ethernet & USB filter
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• Isolation of octoBox is measured at close proximity. Interference is
undetectable in real-life environments when the source of
interference is omni-directional (vs. our directional test antennas).
• The octoBox isolation is measured with data cables
connected through filters, which shows real-life isolation.
Summary
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www.octoscope.com
Boston area headquarters305 Foster Street
Littleton, MA 01460 USA
Tel: +1.978.222.3114
California office780 Montague Expressway, Building 1
San José, CA 95131 USA
Tel: +1.978.339.9431
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