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A compact circularly polarized annular ring antenna is proposed for global navigation satellite systems (GNSS). The antenna is excited by two L-probes connected to the 90± power divider printed on the back. The high impedance of the annular ring working at TM11 mode is transformed to low values by the L-probes. The antenna has a 44.2% 10-dB return loss bandwidth and a 37.8% 3-dB axial ratio bandwidth,...
This paper uses the FDTD method to investigate the magnetized plasma antenna erected on the metal ground. The influence of the external magnetic field B0 on the radiation properties of the antenna is presented. Numerical results demonstrate that the near-field distribution is strengthened and the far-field radiation shifts more to the upper half-space when the external magnetic field B0 builds up...
Novel antenna composed of Koch fractal microstrip patch with H-shaped aperture for the UHF-RFID reader is proposed. The fractal and reflective techniques are introduced to reduce the size of the antenna and enhance the gain of the antenna. The proposed antenna has impedance bandwidth from 900 MHz to 937 MHz for the reflection coefficient to be below - 10dB (VSWR<2). The gain of the antenna at 915...
A minified UHF Tag antenna with two meander dipoles and a match network is proposed and simulated. The antenna is printed with thin copper on a polyimide substrate of 50 um thickness. The dimensions of the antenna are 65 mm in width and 48 mm in length. The simulation results show that the impedance bandwidth is 66 MHz and the radiation efficiency within the bandwidth is over 80%, and the antenna...
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