Hello, polderis-ga!
The only results I could come up with for underwater microwave
antenna applications are in the following abstracts:
"A local field study of a water-immersed microwave antenna array for
medical imagery and therapy." Gou, T.C. ; Guo, W.W. ; Larsen, L.E. EEE
Trans. Microwave Theory Tech. ; Vol/Issue: MTT-32:8 1984 Aug 01
http://www.osti.gov/energycitations/product.biblio.jsp?osti_id=6047119
Abstract:
"A water-immersed microwave array system for medical imaging is
described, and a theoretical analysis of its local field pattern is
presented.^The theoretical study also applies to similar systems for
medical therapy purposes.^It is shown that, using a technique of phase
and amplitude conjugations, a satisfactory three-dimensional focusing
for targets located in the neighborhood of the array may be
achieved.^The focusing resolutions for transverse and longitudinal
directions are approximately lambda/2 and lambda, respectively, where
lambda is the wavelength in the dielectric.^By increasing the element
spacing of the array, the resolutions can be as good as 5.3 and 11.7
mm, respectively, at the operating frequency of 3 GHz."
==
"Water-Immersed Microwave Antennas and Their Application to Microwave
Interrogation of Biological Targets." Jacobi, J.H., Larsen, L.E..
Hast, C.T.
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1129561
Abstract
"This paper describes a method of significantly improving the
resolution of systems used for interrogating the spatial variation of
permittivity of biosystems at S band. The basic principle employed is
to contract the wavelength of the interrogating radiation and to
reduce the physical aperture of the interrogating probes by immersing
the transmitting antenna, receiving antenna, and the target into a
material with a high dielectric constant, namely water. The antenna
design is described, and line scans employing transmitted and
reflected energy are presented."
==
"Microwave time delay spectroscopic imagery of isolated canine
kidney." Jacobi JH, Larsen LE. Med Phys. 1980 Jan-Feb;7(1)
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=7366536&dopt=Abstract
"A method for producing microwave images that are improved through the
reduction of multipath propagation effects is described. This method
employs water immersed antennas and microwave time delay spectroscopy
(TDS) at S-band. It is shown that objects as small as 6 mm in diameter
can be detected. Objects 10 mm apart appear as separate responses on
the image. It is also shown that is possible to generate a
physiologically and anatomically relevant image of an isolated canine
renal specimen."
=====
In another question you asked about marine applications. Searches for
underwater microwave applications bring up results for microwave
marine cables, but that is not the same thing as microwave antennas!
"Microwave Shipboard and Submarine Cable Assemblies - Deutsch Bus &
Microwave, a Compagnie Deutsch division, specialises in the design and
manufacture of rugged microwave and RF cable assemblies and mixed
harnesses for marine and sub-marine applications. The range frequency
is DC-65GHz and the attenuation is the lowest on the market.
http://www.naval-technology.com/contractors/cables/deutsch/index.html
==
You might want to look at this Q/A about microwaves and water, but I
don't think it applies to your question!
http://lofi.forum.physorg.com/Question-about-magnetrons,-microwaves,-and-water_7239.html
==
I hope this helps.
umiat
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