A novel wide-band circularly polarized patch antenna based on L-probe and aperture-coupling techniques

By K. Lau, Kwai‐Man Luk. IEEE Transactions on Antennas and Propagation, 2005

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Broadband Design of Circularly Polarized Microstrip Patch Antenna Using Artificial Ground Structure With Rectangular Unit Cells (2011, methodology): “Many techniques have been employed to increase these bandwidths, such as using stacked patches with truncated opposite corners [1]–[3] and using an L-shaped probe with impedance matching networks [4], [5].”
A Compact, Wideband Circularly Polarized Co-designed Filtering Antenna and Its Application for Wearable Devices With Low SAR (2015, background): “It should be noted that wideband CP antennas with broader bandwidth can be achieved using other techniques such as by employing a thick air substrate [43], dual feeding with a planar hybrid coupler [44], incorporating broadband 90◦ baluns [45], as well as other methods [46], but all require a larger”
Wideband Circularly Polarized Patch Antenna Using Broadband Baluns (2008, unknown): “comprising Wilkinson power dividers [6]–[9], a log periodic balun [10], and a three-stub 90 hybrid coupler [11], have been explored.”