Figure 7 shows normalized radiation patterns obtained from both measurements and simulations. The designed CP patch antenna radiates LHCP, in accordance with the current distribution shown in Figure 3. Cross-polarization levels are below -15.0 dB.

The performance of the CP patch antenna is summarized in Table 1, where it is compared with those of other CP patch antennas.15-20 This antenna demonstrates superior ARBW, impedance bandwidth and gain in a simple and compact structure.

Related Resources

Combined Local Oscillator, Mixer, & Amplifier (LO-MIX)
Integrated Microwave Assemblies (IMAs)
Suspended Substrate Bandpass Filter: BP13G-10G-CD-SFF
Figure 7

Figure 7 Normalized radiation patterns from both simulation and measurement: (a) 3.5, (b) 3.9 and (c) 4.4 GHz.

Table 1


CONCLUSION

A single-feed CP patch antenna with compact and wideband characteristics uses an annular ring microstrip feed line aperture-coupled to the patch through a crossed slot. This results in four resonant frequency points on the |S11| curve and three minimum points on the AR curve. This configuration achieves an impedance bandwidth of 32.5 percent (from 3.45 GHz to 4.79 GHz) and an ARBW of 25.56 percent (from 3.48 GHz to 4.50 GHz). This antenna features a simple structure, a low profile and a wide ARBW, making it suitable for broadband wireless communication applications.

ACKNOWLEDGMENT

This work was supported in part by the Key Laboratory of Intelligent Monitoring on Navigation Safety and in part by the Key Scientific Research Project of the Hunan Provincial Department of Education under Grant 24A0748.

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