Journal
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 14, Issue -, Pages 1770-1773Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2015.2423321
Keywords
Circular polarization; patch antenna; reconfigurable antenna
Funding
- Nature Science Foundation of China [61101047]
- Specialized Research Fund for the Doctoral Program by the Ministry of Education of China [20113219120015]
- Zijin Intelligent Program of Nanjing University of Science and Technology
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A novel circularly polarized (CP) patch antenna with frequency reconfiguration is presented. The antenna consists of a rectangular patch etched with a rectangular-ring slot. Four pairs of varactor diodes are symmetrically placed along the slot. Two orthogonal resonant modes of the patch antenna are simultaneously excited by a single coaxial probe feed. By varying the capacitance values of the varactor diodes with single DC voltage, the resonant frequencies of the two modes can be simultaneously changed. Moreover, by introducing a specific difference between the length and width of the rectangular-ring slot, good CP performances can be obtained over a broad frequency tuning range. A prototype was fabricated and measured. The measured results indicate that a continuously tunable CP operating frequency from 1.92 to 2.51 GHz and stable broadside radiation patterns can be achieved. The measured efficiency rises from about 47% to about 61% as the operating frequency increases from 1.92 to 2.51 GHz.
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