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Isotropic probe? - RF Cafe Forums
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| Mr.Whatever
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Post subject: Isotropic probe?
Posted: Mon Jan 29, 2007 4:43 pm
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| Captain |
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Joined: Fri Apr 07, 2006
6:10 pm
Posts: 18 |
I thought an isotropic antenna is mythical. What
is an isotropic probe? As referred by the
following, site:
http://www.emctd.com/
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nubbage |
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Post subject:
Posted: Tue Jan 30, 2007 7:22 am
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| General |
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Joined: Fri Feb 17, 2006
12:07 pm
Posts: 218
Location: London UK
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It's possible to synthesize an approximation to
an isotropic antenna that is close enough for most
measurement purposes over a limited frequency range.
Three bolometers mutually at right angles is one
solution that springs to mind. Obviously this will
be very insensitive, but it is a three axis RF detector
with broad bandwidth, and so fulfills most criteria
for an isotropic receiving antenna. But then, it
is not a reciprocal device, so cannot be used for
transmission.
If you extend this concept to a
set of three loops or patches, each having good
cross-polar isolation in its own plane, and combine
them in a 3-way combiner, you perhaps have a narrow
band isotropic radiator and detector.
None of
these ideas meets the true full-spectrum reciprocal
well-matched antenna necessary to be an isotrpoic
radiator. To this extent therefore, the true isotropic
radiator is a theoretical concept.
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Lens |
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Post subject: Re: Isotropic probe?
Posted: Sun Feb 04, 2007 8:50 am
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Joined: Sat Feb 03, 2007
4:13 pm
Posts: 3 |
Mr.Whatever wrote:
I thought an isotropic antenna is mythical.
What is an isotropic probe? As referred by
the following, site:
http://www.emctd.com/Isotropic antenna in theory is a Huygens
source with cardiod antenna diagram and directivity
4.77 dBi. It may be two dipoles electrical and magnetic.
Magnetic dipole may be a loop or slot.
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Posted 11/12/2012
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