Design of a TEM waveguide for ultra-wideband applications Page: 4 of 6
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rectangular waveguide of
dimensions a and b. The
Green function method was
employed in the analysis [2]
and the results were verified i
using HFSS, a finite element
package from Ansoft.
3. RESULTS
Cutoff wavelength and Fig. 1. Rectangular waveguide with septum
bandwidth
During the design of an ultra-widebandwidth component, it is necessary to
estimate its bandwidth, where the bandwidth will be limited by the onset of the
first non-TEM mode. The lowest non-TEM mode in an empty, rectangular
waveguide is TEIO with a > b. The simulation results show, as expected from
the field equations [3],
E ~ cos sin nny
a b
E ~sin cos nby
a b
that there is no change of the cutoff wavelength of TEIO mode when the septum
is introduced. We will therefore use that cutoff as the basis of our investigation
of bandwidth. Furthermore, simulations have also shown that the cutoff
wavelengths for the TEO, and TE11 modes in a conventional waveguide (b/a =
0.5) with septum are always greater than the respective cutoffs in a waveguide
without septums as shown in Figures 2 and 3.2.
03
1- - - 55b=010 _ _ _
5- ____ ____ ____ ____
0-______0 0225 045 0675 09
0 0.225 045 0675 09 Ua
tla
Fig. 2. The cutoff wavelength of TE Fig. 3. The cutoff wavelength of TE
with septum normalized to the cutoff with septum normalized to the cutoff
wavelength of TE, without septum wavelength of TE without septum
versus normalized septum width. versus normalized septum width.n,=o (5 .5
5
2
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Pao, H Y & Poggio, A. Design of a TEM waveguide for ultra-wideband applications, article, January 1, 1999; California. (https://digital.library.unt.edu/ark:/67531/metadc780844/m1/4/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.