Design and Study of Wideband Single Feed Circularly Polarized Microstrip Antennas

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Using Thick Substrates and Capacitive Probe Compensation to Enhance the Bandwidth of Traditional CP Patch Antennas (2014, background): “2(b), but one cannot simultaneously obtain good AR and impedance matching as noted in [1].”
Single-Fed Low Profile Broadband Circularly Polarized Stacked Patch Antenna (2014, methodology): “One technique of increasing the substrate thickness to improve the AR bandwidth of the single-fed corner-truncated CP microstrip antenna is studied in [2] and an AR bandwidth of 14% is obtained when the substrate thickness is about .”
Small Circularly Polarized U-Slot Wideband Patch Antenna (2011, background): “As discussed in [10], the U-slot enables the use of thicker substrates to obtain larger impedance bandwidths.”
Broadband Circularly Polarized Patch Antenna With Parasitic Strips (2015, unknown): “Techniques of U-slot and L-probe are often adopted to match impedance [3].”
60-GHz Circularly Polarized U-Slot Patch Antenna Array on LTCC (2013, methodology): “Besides wideband applications, the U-slot patch antenna can be designed for circular polarization operation, by truncating the patch corners [16] or using asymmetric U-slot [17].”