Circularly-Polarized Patch Antennas With Enhanced Bandwidth Based on Capacitively Coupled Orthogonal Patch Radiators

Circularly-polarized (CP) patch antennas with enhanced bandwidth based on capacitively coupled orthogonal radiators are proposed. Several alternately arranged one by along the ${x}$ - and notation="LaTeX">${y}$ -direction, producing currents far fields. The adjacent to each other coupling structure not only contributes power distribution but also introduces 90° phase shift for circularly-polarized radiation. There is no need an additional feeding circuit in design. far-field components mapped excitation voltage of equivalent model a quantitative design method theoretical axial ratio response can be predicted analyzed. Wideband CP 3 4 under profile notation="LaTeX">$0.035{\lambda }_{0}$ designed, fabricated, measured as examples. Full-wave simulation results agree well ones. Multiple minima produced form wide bandwidth. overlap bandwidths reflection coefficient, realized gain, these two 4.9% 6.3%, respectively.