High isolation between the feed probes is achieved by dividing the antennas with the SIW vias. Measurement and simulation results for coupling between ports is shown in Figure 5. Isolation between ports 1 and 2 is greater than 26 dB.

Figure 5

Figure 5 Simulated vs. measured coupling between ports 1 and 2.

The antenna gains are approximately 3 and 7 dB at 2.4 and 5.8 GHz, respectively, as shown in Figure 6. The antenna radiation patterns were measured in an anechoic chamber for the two antenna bands. Figure 7 shows the radiation patterns corresponding to the 2.4 GHz band, and Figure 8 shows the patterns corresponding to the 5.8 GHz band. Good agreement between measurement and simulation is observed. Overall performance compared with other published work is summarized in Table 2.

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Table 2

 

Figure 6

Figure 6 Simulated vs. measured antenna gain.

Figure 7

Figure 7 Normalized simulated vs. measured radiation patterns for the 2.4 GHz antenna: E-field (a) and H-field (b).

Figure 8

Figure 8 Normalized simulated vs. measured radiation patterns for the 5.8 GHz antenna: E-field (a) and H-field (b)..

CONCLUSION

A dual-band, two-port SIW cavity antenna is composed of two independent antennas operating with different modes and effectively isolated with SIW metalized vias. The antenna resonant frequencies can be tuned independently for dual-band ISM operation. The planar antenna structure and its performance make it a suitable candidate for integration with chemical sensors for wireless sensor networks.

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