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This application notes presents how to
model an LPDA antenna in WIPL-D software suite. Simulation results at
different operating frequencies are also presented.
Antenna Model
A Log-Periodic Dipole Antenna with 52
printed dipoles is created in WIPL-D AW Modeler and then simulated in
WIPL-D Pro. Due to symmetry of the LPDA antenna, only half of the
structure is simulated. The antenna is printed on a 0.813 mm thick
dielectric substrate having dielectric permittivity of r=2.33. Entire
antenna is around 261 mm long and is placed 4.25 mm away from the
metallic circle having a diameter of 248 mm. The longest arm of
the antenna is around 76.2 mm long while the length of the shortest one
is around 1.53 mm.
In
order to have very accurate results, the WIPL-D Pro Edge feature
is implemented in all projects.
The antenna is presented in Fig 1. It is fed at its top (Fig. 2).
Figure 1. LPDA Antenna
Figure 2. Feeding of the LPDA Antenna
Simulation and Results
Simulation times and number of unknowns needed for simulating the LPDA
antenna at different operating frequencies in the frequency range from
1GHz to 18GHz, are presented in Table 1.
Table 1. Simulation times and required number of unknowns
Radiation patterns at different frequencies in the horizontal plane of
radiation are shown in Figs. 3-8.
Figure 3. Radiation pattern in the horizontal plane at 1 GHz
Figure 4. Radiation pattern in the horizontal plane at 3 GHz
Figure 5. Radiation pattern in the horizontal plane at 5 GHz
Figure 6. Radiation pattern in the horizontal plane at 8 GHz
Figure 7. Radiation pattern in the horizontal plane at 12 GHz
Figure 8. Radiation pattern in the horizontal plane at 18 GHz
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