Port 1 for unequal power split designs. This offset
compensates for the output phase differences introduced
when offsetting the wedge is needed to achieve
an unequal power split, thus providing in-phase excitation,
which is essential for antenna arrays designed
for broadside radiation.
To avoid sharp corners within the junction, both
fillet structures and rounded tips are used for both the
diaphragms and the wedge, where the fillet radii are
r1 and r2, and rounding diameters are C1 and C2,
respectively. Their relationships are: r1 5 L3 2 C1/2
and r2 5 L1 2 C2/2. The selection of these discontinuity
shapes has been driven by our goals to simplify
casting fabrication of the waveguide feed network,
which is highly desirable for mass production.
The rounding diameters of the wedge and diaphragms
are primarily dictated by the manufacturing
accuracy. They are initially set to 0.04 times the
guided-wavelength kg in the waveguide that is C1 5
C2 5 0.04kg. Meanwhile structures with D1 5 D2 5
0 are used for equal power split designs. Based on
extensive parametric studies using HFSS, we concluded
the following:
Port 1 for unequal power split designs. This offset
compensates for the output phase differences introduced
when offsetting the wedge is needed to achieve
an unequal power split, thus providing in-phase excitation,
which is essential for antenna arrays designed
for broadside radiation.
To avoid sharp corners within the junction, both
fillet structures and rounded tips are used for both the
diaphragms and the wedge, where the fillet radii are
r1 and r2, and rounding diameters are C1 and C2,
respectively. Their relationships are: r1 5 L3 2 C1/2
and r2 5 L1 2 C2/2. The selection of these discontinuity
shapes has been driven by our goals to simplify
casting fabrication of the waveguide feed network,
which is highly desirable for mass production.
The rounding diameters of the wedge and diaphragms
are primarily dictated by the manufacturing
accuracy. They are initially set to 0.04 times the
guided-wavelength kg in the waveguide that is C1 5
C2 5 0.04kg. Meanwhile structures with D1 5 D2 5
0 are used for equal power split designs. Based on
extensive parametric studies using HFSS, we concluded
the following:
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