From simulation to realization

btty038

From simulation to realization [Copy link]

Microstrip Patch Antenna
From Simulation to Implementation
In the Ansoft HFSS Tutorial 1, a microstrip patch antenna was simulated and numerical return loss and radiation pattern were shown. The purpose of this tutorial is to further discuss the microstrip patch antenna and show experimental results. In particular, the dimensions of the patch are given along with the feeding network. The dimensions and how they were obtained are discussed. The fabricated microstrip patch antenna is also shown. The experimental return loss and experimental E and H plane radiation patterns are compared with the Ansoft HFSS results. In addition, the 3D radiation pattern of the fabricated antenna is shown. The purpose of this tutorial is to show the reader a comparison of numerical and experimental results.

Figure 1 Microstrip patch antenna model; edge feed with quarter-wave transformer section to 50 Ω transmission line.
Microstrip patch model The
microstrip patch antenna model used for numerical simulation in Ansoft HFSS is shown in Figure 1. The patch antenna is designed to operate at 2.4 GHz on a substrate with a dielectric constant of 2.2 and a thickness of 1.57 mm. To determine the width (W), the Microstrip Patch Antenna Calculator is used to provide an initial starting point. The length (L) is chosen to be the same as W to obtain a symmetrical radiation pattern. The patch without the feed network is simulated in Ansoft HFSS to adjust W to resonate at 2.4 GHz. Next, the input impedance at the edge of the patch is determined by placing a transmission line of length 50 Ω at the edge. By de-embedding the 50 Ω transmission line, the edge input impedance is determined to be 343 Ω. Therefore, a quarter-wave transformer is used to match the 343 Ω input impedance to the 50 Ω system. The final size of the entire microstrip patch antenna is

• Width: 41.08 mm

• Length: 41.08 mm

• l qw : 24.05 mm

• w qw : 0.72 mm

• l 50 : 15.00 mm

• Width 50: 4.84 mm

Implementation
After HFSS simulation confirmed the resonance at 2.37 GHz with a return loss less than -10 dB, the microstrip patch antenna was implemented by photolithography. Figure 2 shows the microstrip patch antenna with a 3.5 mm SMA female connector compared to the HFSS model. A comparison of the numerical and experimental return losses is shown in Figure 3. Good agreement can be seen between the HFSS and measured results.

Figure 2. Microstrip patch antenna: model and reality.

Figure 3. Return loss of the microstrip patch antenna.
Radiation pattern The
fabricated antenna was then placed in the antenna chamber. Figure 4 shows the antenna mounted on a rotating stage. The near field of the microstrip patch antenna was measured using a waveguide probe and post-processed to obtain the far-field radiation pattern.
Figure 4. Prefabricated microstrip patch antenna that can be used for near-field sampling.
The numerical and experimental E-plane and H-plane radiation patterns are shown in Figures 5 and 6, respectively. Good agreement can be seen, with the difference at the back being due to the metal mounting structure of the antenna chamber rotating stage. Figure 7 shows the experimental 3-D radiation pattern of the microstrip patch antenna.
Figure 5. E-Plane radiation pattern.

Figure 6. H-plane radiation pattern.

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Figure 7. 3-D radiation pattern.

lugl4313820

Can this antenna be considered three-dimensional or four-dimensional?

btty038

lugl4313820 posted on 2022-8-18 20:46 Can this antenna be considered three-dimensional or four-dimensional?

This is mainly a 3D display