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Microstrip patch antennas are among the
most popular antennas, used in various application areas. Model building
for this type of antennas can be done in two ways: in WIPL-D
general-purpose 3D modeler and in the tool specialized for printed
structures, AW Modeler. A simple microstrip patch antenna is simulated
here. The simulated results are verified with measurements performed by
WIPL-D staff.
The antenna is printed on RT Duroid 5880
substrate of height 1.5748 mm and of complex permittivity 2.2(1-j
0.0004). The model is made on a finite substrate and over finite ground
plane (Fig. 1). The copper conductor is taken with finite conductivity
of σ = 19 MS/m, to account for surface roughness. The antenna is fed by
a probe that is extended to a coaxial line. A part of the coaxial line
is included in WIPL-D model to simulate effects of realistic coaxial
feed (Fig. 2).
The simulated and measured S-parameters
(Fig. 4), and radiation pattern in E-plane (Fig. 5) agree excellently.
The software predicted the resonance at 1.905 GHz, while measurements
pointed to 1.906 GHz. The simulated bandwidth is 19.35 MHz while the
measured one is 19.3 MHz. The relative discrepancy is 0.05 % for
resonant frequency and 0.25 % for bandwidth. The prototype (Fig. 3) is
fed from the back side, by a probe which is connected to coax line via
standard SMA connector.
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Figure 1. WIPL-D Model of Patch
Antenna |
Figure 2. Coaxial Feed of the
Antenna |
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Figure 3. Front Side of Antenna
Prototype |
Figure 4. S11 of the coaxially
fed patch antenna |
Figure 5. Radiation pattern in
E-plane |
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