Abstract.
A new
realization of a TEM-waveguide based on an artificial magnetic conductor made
of periodic grids of capacitive type is proposed The paper considers a rectangular TEM-waveguide,
in which two “narrow” walls are made of artificial magnetic conductor on the
basis of two gratings made of metal elements of square shape. Simple
expressions are obtained to calculate the structure of the electromagnetic
field in such a waveguide. As a calculation model, a TEM-waveguide with an
internal cavity size of 16x24 mm2 (a=16mm, B =24mm) is taken. The approximate
boundary conditions on the artificial magnetic conductor surface were used to
calculate the main characteristics of the TEM-waveguide (transverse wave
number, constant propagation, field distribution). The transmission frequency
bands is evaluated in the case of a TEM-waveguide excited by a quasiuniform
field. It is shown that near the resonant frequency of the artificial magnetic
conductor the structure of the field in the internal cavity of the waveguide is
close to the field of the TEM-wave. It is experimentally confirmed that the
passage band of the TEM-waveguide is determined by the value of the operating band
of the artificial magnetic conductor.
Key words:
artificial magnetic conductor,
periodic gratings of capacitive type, electromagnetic field structure, TEM -wave,
resonant frequency.
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