Compact Asymmetric-Slit Microstrip Antennas for Circular Polarization

By Nasimuddin, Xianming Qing, Zhi Ning Chen. IEEE Transactions on Antennas and Propagation, 2011

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Compact Circularly Polarized Asymmetrical Fractal Boundary Microstrip Antenna for Wireless Applications (2014, background): “Based on the slits [6], [7], stubs, and slot-loaded [8]–[10] techniques, several single-layer single-feed asymmetrical structures are suggested for CP operation.”
RIS-Based Compact Circularly Polarized Microstrip Antennas (2013, methodology): “This is usually achieved by chamfering the square patch radiator corners [1] or making slots or slits with respect to suitable feeding location [2]–[4].”
Quarter-Mode Substrate Integrated Waveguide and Its Application to Antennas Design (2013, unknown): “One class of the CP antennas is microstrip patch antennas with a slight perturbation in the antenna structure at appropriate locations to excite orthogonal modes with 90 phase difference [7]–[10], or microstrip patch antennas with a coupling crossed slots on the patch [7], [11]–[14].”
Compact Circularly-Polarized Patch Antenna Loaded With Metamaterial Structures (2011, methodology): “The single-fed configuration involves an orthogonal pair of modes with 90 phase shift, which usually requires an appropriate feeding position to generate the phase difference and a small perturbation on the antenna structure to excite the orthogonal modes, such as the slits, truncated corners, and t”