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Circularly Polarized Microstrip Antenna for WLAN Analyzed With XFdtd

circularlypolarizedmicrostripantenna_clip_image014A circularly polarized microstrip antenna is simulated in XFdtd® and return loss results are compared to measurements.

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    Figure 1:
    XFdtd CAD view of the antenna.
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     Figure 2:
    XFdtd simulated and measured return loss for the antenna.
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     Figure 3:
    Gain in the Phi=0 plane at 5.5GHz.
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     Figure 4:
    Gain in the Phi=90 plane at 5.5GHz.
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     Figure 5: Circularly Polarized Gain in the Phi=0 Plane at 5.5 GHz.
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     Figure 6:
    Circularly Polarized Gain in the Phi=90 Plane at 5.5GHz.
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     Figure 7:
    Total Gain at 5.5GHz.
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     Figure 8:
    Phi-Directed Gain at 5.5 GHz
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     Figure 9:
    Theta-directed gain at 5.5 GHz.

A circularly polarized microstrip antenna is simulated in XFdtd and return loss results are compared to measurements. The antenna design and measurements are taken from IEEE journal paper

M. Ali, G. Yang, and R. Dougal, “A New Circularly Polarized Rectenna for Wireless Power Transmission and Data Communication,” IEEE Ant. and Wireless Propag. Letters, Vol. 4, pp. 205-208, 2005.

A non-uniform mesh with 0.2 x 0.2 x 0.3175 mm cells is chosen as the base cell size. The metal region of the antenna is placed in a 0.1 x 0.1 mm adaptive mesh. The outer boundary is an 8 layer UPML with 30 cells padding for the direction above antenna while the other boundaries touch substrate. A PEC boundary is used in place of ground plane under the antenna.

Radiation patterns at 5.5GHz were computed and are shown in Figures 3 and 4. A three dimensional plot of the total gain at 5.5 GHz is shown in Figure 5.

 

 
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