Please use this identifier to cite or link to this item: https://doi.org/10.1109/TAP.2009.2024584
Title: Broadband circularly polarized annular-ring microstrip antenna
Authors: Guo, Y.-X. 
Bian, L.
Shi, X.Q.
Keywords: Circular-polarization
Microstrip antennas
Wideband antennas
Issue Date: 2009
Source: Guo, Y.-X., Bian, L., Shi, X.Q. (2009). Broadband circularly polarized annular-ring microstrip antenna. IEEE Transactions on Antennas and Propagation 57 (8) : 2474-2477. ScholarBank@NUS Repository. https://doi.org/10.1109/TAP.2009.2024584
Abstract: A wideband circularly polarized (CP) annular-ring patch antenna with two proximity-coupled L-probe feeds orientated to have phases of 0° and 90°, using a broadband 90° hybrid feed, is proposed. It is found that the current distribution for CP operation can be improved by cutting a smaller concentric circular slot on the original larger circular patch to form an annular-ring patch. With such an arrangement, the proposed antenna delivers a wider axial ratio (AR) bandwidth than that of the conventional circular patch with the identical feeding technique. Considering the common overlapped bandwidth limited by the impedance, AR and gain, the proposed annular-ring patch antenna exhibits an effective bandwidth of 38% from 1.5 to 2.2 GHz, which is wider than the corresponding bandwidth of 29.7% from 1.35 to 1.82 GHz for the conventional circular patch. Moreover, the effective bandwidth of 38% for the proposed annular-ring antenna is also much wider than those for the other annular-ring patch antennas in the literature. © 2009 IEEE.
Source Title: IEEE Transactions on Antennas and Propagation
URI: http://scholarbank.nus.edu.sg/handle/10635/55234
ISSN: 0018926X
DOI: 10.1109/TAP.2009.2024584
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