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Progress In Electromagnetics Research
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A WIDEBAND WIDE-STRIP DIPOLE ANTENNA FOR CIRCULARLY POLARIZED WAVE OPERATIONS

By L.-P. Chi, S.-S. Bor, S.-M. Deng, C.-L. Tsai, P.-H. Juan, and K.-W. Liu

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Abstract:
A thin dipole antenna is a well-known antenna with linearly polarized wave operation. In this work, a wide-strip dipole antenna is proposed for circularly polarized wave operations. To obtain circularly polarized (CP) wave operations, there are two conditions to be satisfied. One is that the antenna must have two degenerated orthogonal modes with different resonant frequencies. The other is that the phase difference of two orthogonal modes is 90 degrees. To match the first condition, the slab width W is tuned to generate current distributions directed in two different directions. In addition, the second condition is matched by asymmetric feeding point by adjusting the overlapped square width C. The parametric study is completed by the Ansoft HFSS simulator. Simulated results reveal that the CP wave is mainly influenced by the slab width W. The influences of the parameters C and d on the performances of the proposed antenna are also investigated in this paper. Taking -8 dB as reference, there are two working bands for this proposed antenna and the measured center frequencies are 0.66 GHz and 2.04 GHz, respectively, and the corresponding bandwidths are 0.27 GHz (40%) and 1.78 GHz (87%), respectively. In addition, the measured center frequencies and bandwidths of the axial ratio are 1.94 GHz and 0.53 GHz (27%), respectively.

Citation:
L.-P. Chi, S.-S. Bor, S.-M. Deng, C.-L. Tsai, P.-H. Juan, and K.-W. Liu, " a wideband wide - strip dipole antenna for circularly polarized wave operations ," Progress In Electromagnetics Research, Vol. 100, 69-82, 2010.
doi:10.2528/PIER09112201
http://www.jpier.org/PIER/pier.php?paper=09112201

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