期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 67, 期 4, 页码 2723-2728出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2019.2900386
关键词
Dielectric resonator antenna (DRA); p-i-n diode; polarization reconfiguration; polarizer
资金
- Research Grant Council of Hong Kong, SAR, China [CityU 11266416]
In this communication, we introduce a p-i-n-diode-based polarizer integrated with a dielectric resonator antenna (DRA) to realize a polarization reconfigurability. The p-i-n-diode-based polarizer is found to be effective in altering the electromagnetic-field distribution of the DRA, such that the polarization of the DRA can be actively changed. Unlike conventional p-i-n-diode-based reconfigurable antennas, the proposed active polarizer would not degrade radiation performance of the DRA. In this way, the antenna retains the high radiation efficiency with its simple excitation. The proposed antenna uses a simple and agileswitching mechanism to provide three switchable polarizations to the DRA including: a y-axis polarization (STATE 1), a + 45 degrees polarization (STATE 2), and a -45 degrees polarization (STATE 3) across a wide effective bandwidth (overlapped bands of three states) of 15.0%. The radiation efficiencies maintain 65%-79% in each state throughout the effective operating band. Finally, the experimental results agree well with the theoretical analyses.
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