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  Topic: Antenna aperature
coundpake

Replies: 3
Views: 2696

PostForum: Questions Related to Antenna Theory   Posted: Thu Mar 16, 2017 7:23 pm   Subject: Antenna aperature
Best way to assess this would be to use a network analyzer to measure S21 between the two antennas, or if you dont have that, a signal generator and power meter.

But if you want to approximate the ...
  Topic: Short range 2-5GHz antenna design
coundpake

Replies: 6
Views: 3493

PostForum: Questions Related to Antenna Theory   Posted: Mon Mar 13, 2017 9:57 pm   Subject: Short range 2-5GHz antenna design
The problem with the data rate of your wireless link might be due to large amounts of reflection or resonances inside your metal box. You might want to try adding absorber to the walls of the box.
...
  Topic: Friis Transmission Equation Frequency Dependence Question
coundpake

Replies: 3
Views: 2722

PostForum: Questions Related to Antenna Theory   Posted: Mon Mar 13, 2017 8:58 pm   Subject: Friis Transmission Equation Frequency Dependence Question
You're right, it has nothing to do with free-space loss. If you were designing a communication systems between satellites in space you would just consider different frequencies to propagate equally. H ...
  Topic: Surface finish for printed antennas
coundpake

Replies: 3
Views: 6300

PostForum: Questions Related to Antenna Theory   Posted: Thu Aug 04, 2016 2:31 am   Subject: Surface finish for printed antennas
Usually when PCB antennas are used they're (and the rest of the board) coated in solder mask which prevents them from corroding - so they aren't usually plated. The parts that need to be exposed - li ...
  Topic: differential vs single-ended feeding of antennas
coundpake

Replies: 1
Views: 6580

PostForum: Questions Related to Antenna Theory   Posted: Wed Aug 03, 2016 10:23 pm   Subject: differential vs single-ended feeding of antennas
Usually a single-ended fed antenna uses the system ground as the return path. This can affect the radio by introducing unwanted signals from the rest of the system (desense) and make the radio more se ...
  Topic: Transmit or Receive LPDA antenna
coundpake

Replies: 1
Views: 6216

PostForum: Questions Related to Antenna Theory   Posted: Wed Aug 03, 2016 9:34 pm   Subject: Transmit or Receive LPDA antenna
Antennas are reciprocal, meaning they will work equally as receivers or transmitters.

http://www.antenna-theory.com/definitions/reciprocity.php
  Topic: Passive antenna for off grid cell reception
coundpake

Replies: 2
Views: 6197

PostForum: Questions Related to Antenna Theory   Posted: Wed Aug 03, 2016 9:19 pm   Subject: Passive antenna for off grid cell reception
This might not be the best idea (for reasons pointed out below) but as far as a passive system goes...

You could use an LTE (700 MHz) directional antenna (Yagi-Uda) pointed towards your nearest/str ...
  Topic: LTE Hotspot External Antenna
coundpake

Replies: 3
Views: 6123

PostForum: Questions Related to Antenna Theory   Posted: Wed Aug 03, 2016 8:45 pm   Subject: LTE Hotspot External Antenna
What I meant by Out of Band was more a function of how the specific antenna was tuned which affect the oscillation frequency. The antenna itself, if not a correct one, would in essence re-tune the fre ...
  Topic: distance between two antenna arrays
coundpake

Replies: 1
Views: 4560

PostForum: Questions Related to Antenna Theory   Posted: Wed Aug 03, 2016 8:25 pm   Subject: distance between two antenna arrays
Hi Saleem,

Are you asking about how much distance is necessary to isolate the antennas on the same mast from interfering with each other?
  Topic: good Friis Transmission results
coundpake

Replies: 1
Views: 6192

PostForum: Questions Related to Antenna Theory   Posted: Wed Aug 03, 2016 12:47 am   Subject: good Friis Transmission results
Whether the received power you've calculated is "good" or "bad" is dependent on the receiver's sensitivity level (will probably be specified - lower is better) which you want to be ...
 
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