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A reflection cancelling slot set in a linearly polarized radial line slot antenna

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3 Author(s)
Takada, J.-i. ; Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Japan ; Ando, M. ; Goto, Naohisa

A radial line slot antenna (RLSA) is a high-gain and high-efficiency planar antenna. A linearly polarized RLSA (LP-RLSA) is attractive for applications of various subscriber radio systems. However, the slot arrangement for linear polarization gives rise to serious reflection from slots, which disturbs the normal antenna operation. A new LP-RLSA slot design is presented where reflection canceling slots are added to the conventional ones; four slots form one slot set as a unit radiator of linear polarization. The experiments confirm the design: the antenna return-loss is improved from -2 to -10 dB. Antenna efficiencies of 48 and 54% are measured for 400 and 600-mmφ antennas, respectively. This is the first report of the normal operation of LP-RLSAs

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:40 ,  Issue: 4 )

Date of Publication:

Apr 1992

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