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In this paper, negative permeability metamaterial structure based electrically small loop antenna is built and tested. The size of proposed antenna is ka = 0.27 by Chu limit. The experimental result shows that the resonant frequency and impedance bandwidth (VSWR les 2) are 910.76 MHz and 6.7 MHz (908-914.7 MHz). The proposed antenna has maximum gain of -1.302 dBi and radiation efficiency of 21.43%...
In this paper, the high gain and broadband antenna operating for SDMB (Satellite Digital Multimedia Broadcasting) system is proposed. The proposed antenna consists of the SAP (Shorted Annular Patch) structure, which inhibits surface-wave and the parasitic SAP element with spacing of 0.25 lambda0 in order to improve gain, bandwidth and directivity. The RHCP (Right Hand Circular Polarization) is generated...
In this paper, the reconfigurable annular ring slot antenna with circular polarization diversity is proposed for SDMB(satellite digital multimedia broadcasting) system. The proposed antenna consists of a ring slot with tuning stubs. Four PIN diodes are attached to achieve circular polarization diversity. By switching the diodes on or off, the proposed antenna can be operated either RHCP(right hand...
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