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This paper presents a dual-circularly polarized (dual-CP) antenna with simple configuration, low-profile, and wide bandwidth. Its primary radiating element is an aperture-coupled patch loaded with a stacked patch for a wide operational bandwidth. A single-section hybrid coupler is utilized as a feeding structure of the antenna to generate dual-CP radiation. Different from the priors normally requiring both wideband radiator and wideband feeding structure, this work demonstrates that the wideband dual-CP radiation can be obtained by combining a wideband radiator and a conventional hybrid coupler. A design operating at the center frequency of 5.5 GHz has been fabricated and tested. The measurements result in a &#x2212;10-dB reflection coefficient bandwidth of 30.0&#x0025; (4.66 &#x2013; 6.31 GHz), a 10-dB isolation bandwidth of 30.9&#x0025; (4.66 &#x2013; 6.35 GHz), a 3-dB axial ratio (AR) bandwidth of 29.1&#x0025; (4.70 &#x2013; 6.30 GHz), and a realized broadside gain of 5.5 &#x2013; 7.05 dBic. For a more robust dual-CP radiation, a low-sidelobe 4 <inline-formula> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> 4 element array of the proposed antenna has been designed, fabricated, and measured. Compared to the single element design, the array prototype yields similar impedance and 3-dB AR bandwidths, but a higher isolation. The measurements on the array prototype result in an isolation of <inline-formula> <tex-math notation="LaTeX">$\geq 14$ </tex-math></inline-formula> dB, a peak gain of 16.3 dBic, a side-lobe level of <inline-formula> <tex-math notation="LaTeX">$\leq -20$ </tex-math></inline-formula> dB, and a cross-polarization of <inline-formula> <tex-math notation="LaTeX">$\leq -16$ </tex-math></inline-formula> dB across the frequency range of 4.7 &#x2013; 6.3 GHz (29.1&#x0025;).

Wideband Dual-Circularly Polarized Antennas Using Aperture-Coupled Stacked Patches and Single-Section Hybrid Coupler