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Evaluation of the MIMO Antenna Testing

389 a b Figure 7. Radiation pattern of a single antenna a E‐field b H‐field. Next, the x MMO antennas are evaluated by activating PN diodes , , and . MMO antennas and connected to Port A, and and connected to Port B are also evaluated separately in terms of reflection coefficient and inter‐port isolation, see Figure 8. solation between ports A and B are at least dB. Figure 8. Inter‐port isolation of the 2x2MIMO antenna. Similar to the previous structure, the radiation pattern of x MMO are performed separately at . Gz and summarized in Figure . Note that the same forward radiation is exhibited with a narrower beamwidth compared to the previous single antenna due to the additional array elements. Simulated and measured results agreed with slight minor lobe disagreements. 390 a b Figure 9. Radiation pattern of dual MIMO antenna a E‐field b H‐field. The third antenna operation as a single, high gain x array is evaluated by activating all PN diodes to enable each element’s connection to the transmission line.. ts radiation pattern is measured at . Gz, similar to previous evaluations, and shown in Figure . Notice that the beam direction is narrower compared to the previous single and dual MMO antenna. a b Figure 10. Radiation pattern of single MIMO antenna a E‐field b H‐field

5. Conclusion

A reconfigurable MMO antenna system for WLAN and LTE standards has been proposed, consisting of rectangular slotted microstrip antenna elements. They form an array antenna which can either be configured as a x or x MMO antenna system, or can also be used as a conventional high gain directional array. Pattern configurability is achieved via the switching of six PN diodes located on the microstrip transmission line. Measurements confirmed that the antenna is operational from . 8 to . 8 Gz, agreeing well with simulationswith optimal reflection coefficients of ‐ .8 dB at . Gz and ‐ . dB at . Gz, respectively. The proposed system is then integrated within a WLAN access point and further evaluated in a practical environment. Both x and ×

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