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A circularly polarized (CP) stack antenna with tri-band operation is presented. The proposed antenna has a square loop resonator with the perturbation to present dual-mode effects, and it is excited by a strip with the tuning stub through the coupling of an aperture in the ground plane. The ability to enhance the bandwidth and reconfigure the CP performances is achieved by the perturbation and the...
A novel fractal antenna constructed with Hilbert curve and complementary configuration is proposed for UHF RFID tag antenna design in this paper. For the improvement of conventional meander-line RFID tag antenna, the inductive and wideband performance in addition the balun feature of the complementary configuration is presented. The wide-band characteristics of frequency responses, impedance spectrum,...
Using configuration synthesis and design map, the CPW-fed circular fractal slot antennas are proposed for dual-band applications. In practice, the experimental results with broadband and dual-band responses (47.4% and 13.5% bandwidth) and available radiation gains (peak gain 3.58 and 7.28 dBi) at 0.98 and 1.84 GHz respectively for half-wavelength design are achieved firstly. Then, the other broadband...
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