This study proposes a novel 2 Ã?â?? 2 array antenna design with broadband and circularly-polarized (CP) operation. The proposed\r\ndesign uses a simple series-fed network to increase the CP bandwidth without requiring one-by-one adjustment of each array\r\nelement or a complex feed network. Selecting the appropriate spacing between each array element allows the proposed array\r\nantenna to generate CP radiation with a low axial ratio. Experimental results based on a prototype show that this 2 Ã?â?? 2 microstrip\r\narray antenna achieves a wide 3 dB axial ratio bandwidth of more than 10%. Simulated data are also provided to confirm the\r\nmeasured results.
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