Abstract. Three types of matched
loads (MLs) are considered that can be used in devices for determining the
composition of media and in introscopes in the millimeter and submillimeter
wave ranges. The first type of ML uses water as an absorbing medium, and the
matching is performed by a plate made of a polystyrene-rutile composite material
with specially chosen characteristics. The reflection from this ML at frequency
of 100 GHz is as low as -47 dB. The second type of ML uses an anisotropically
conducting film, the absorbing medium being water, as in the ML of the first
type. In this case, the dielectric layer is free of the conditions imposed on
it in the ML of the first type and can be made, say, of teflon. Matching to
water is performed by varying the anisotropy axis of the film with respect to
the electric vector of the incident wave. The reflection from this ML at
frequency of 100 GHz reaches a value of -40 dB for an angle of 0.91 rad between the anisotropy
axis of the film and the electric vector of the wave. The ML of the third type consists
of an absorbing layer placed at a distance from a metal reflector, the distance
being chosen so that the absorbing film is at the maximum of the electric field
of the standing wave. The absorbing layer consists of three sheets of special
carbonized radio-absorbing paper. In this ML, we obtained a reflection
coefficient of -40 ไม at frequency of 100
GHz.
Key words: matched
load, millimeter waves, anisotropically conducting film.
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