A CPW-fed slot antenna for achieving dual-band dual-sense circular polarization is introduced. The dual-band circularly polarized operations are generated by the slots loaded in the two opposite corners and the halberd-shaped strip connected at the end of the signal line of the CPW. The left-hand and right-hand circularly polarized performances can be achieved simultaneously for the lower and the upper band, respectively. The measured impedance bandwidth for 10-dB return loss at 2.5 and 3.5 GHz operating bands can be up to 1100 MHz and 260 MHz, respectively. The measured 3-dB axial ratio bandwidths are 30.8% for lower band (LHCP) and 3.1% for upper band (RHCP), which are completely inside their respective impedance bands. The designed antenna has a simple uniplanar structure and occupies a compact size of 40×40 mm2, including the finite ground CPW feeding mechanism. Moreover, the antenna gain variations across the two operating bands are less than 1 dB.
2. Joseph, R. and T. Fukusako, "Bandwidth enhancement of circularly polarized square slot antenna," Progress In Electromagnetics Research B, Vol. 29, 233-250, 2011.
doi:10.2528/PIERB11030406
3. Sze, J.-Y. , K.-L. Wong, and C.-C. Huang, "Coplanar waveguide-fed square slot antenna for broadband circularly polarized radiation," IEEE Trans. Antennas Propag., Vol. 51, No. 8, 2141-2144, 2003.
doi:10.1109/TAP.2003.815421
4. Chou, C. C., K. H. Lin, and H. L. Su, "Broadband circularly polarized cross-patch-loaded square slot antenna," Electron. Lett., Vol. 43, No. 9, 485-486, 2007.
doi:10.1049/el:20070189
5. Chen, Y. B., X. F. Liu, Y. C. Jiao, and F. S. Zhang, "CPW-fed broadband circularly polarized square slot antenna," Electron. Lett., Vol. 42, No. 19, 1074-1076, 2006.
doi:10.1049/el:20062048
6. Sze, , J.-Y. and C.-C. Chang, "Circularly polarized square slot antenna with a pair of inverted-L grounded strips," IEEE Antennas Wirel. Propag. Lett., Vol. 7, 149-151, 2008.
doi:10.1109/LAWP.2008.921341
7. Bao, X. L. and M. J. Ammann, "Dual-frequency circularly-polarized patch antenna with compact size and small frequency ratio," IEEE Trans. Antennas Propag., Vol. 55, No. 7, 2104-2107, 2007.
doi:10.1109/TAP.2007.900271
8. Nayeri, P., K.-F. Lee, A. Z. Elsherbeni, and F. Yang, "Dual-band circularly polarized antennas using stacked patches with asymmetric U-slots," IEEE Antennas Wirel. Propag. Lett., Vol. 10, 492-495, 2011.
doi:10.1109/LAWP.2011.2153820
9. Chen, C. H. and E. K. N. Yung, "Dual-band circularly-polarized CPW-fed slot antenna with a small frequency ratio and wide bandwidths," IEEE Trans. Antennas Propag., Vol. 59, No. 4, 1379-1384, 2011.
doi:10.1109/TAP.2011.2109347
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