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  Topic: Flexi PFIA close to the body...
dnyberg2

Replies: 1
Views: 6931

PostForum: Questions Related to Antenna Theory   Posted: Tue Aug 11, 2015 6:24 pm   Subject: Flexi PFIA close to the body...
Does anyone have any advice for a thin flexible polyimide PIFA design that is ground plane backed for 915 MHz? I am radiating RF (<1W) into the body to interrogate a temp pill that got swallowed i ...
  Topic: Open Transmission Line...
dnyberg2

Replies: 5
Views: 11658

PostForum: Questions Related to Antenna Theory   Posted: Fri Mar 09, 2012 2:12 pm   Subject: Open Transmission Line...
Are you sure the phase is set correctly on your VNA? That is, when nothing is connected, do you see an open circuit (infinite impedance, zero capacitance or very high inductance)?

I calibrated the ...
  Topic: EIRP measurements...
dnyberg2

Replies: 2
Views: 9192

PostForum: Questions Related to Antenna Theory   Posted: Thu Mar 08, 2012 8:34 pm   Subject: Re: EIRP
EIRP is a measurement of power transmitted at a single direction relative to an antenna. So if you have a known transmitted power from a source antenna (P1), and a known pathloss (L), then the receiv ...
  Topic: Open Transmission Line...
dnyberg2

Replies: 5
Views: 11658

PostForum: Questions Related to Antenna Theory   Posted: Thu Mar 08, 2012 8:33 pm   Subject: Re: Transmission Lines, Antennas and Capacitance
How did you determine the capacitance rises sharply near the end of the coax?

My guess: Remember an open circuited transmission line (at the end) is two separated conductors. This is a capacitor. ...
  Topic: Open Transmission Line...
dnyberg2

Replies: 5
Views: 11658

PostForum: Questions Related to Antenna Theory   Posted: Thu Mar 08, 2012 5:06 pm   Subject: Open Transmission Line...
I had an occasion to hook up a piece of open ended coax to a network analyzer. I know the wire has some pF per foot but I expected it to be linear over inches but it wasn't. In other words instead o ...
  Topic: EIRP measurements...
dnyberg2

Replies: 2
Views: 9192

PostForum: Questions Related to Antenna Theory   Posted: Wed Mar 07, 2012 5:04 pm   Subject: EIRP measurements...
I understand what EIRP is, but I see that it is mostly calculated using the PWR input and the gain of an antenna. What about the radiation pattern? A polar plot of radiated PWR? Isnt that the best r ...
 
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