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A novel and compact dual band dual sense circularly polarized microstrippatch antenna with single coaxial feed has been reported in the present work.The key idea of generating dual band circular polarisation (CP) is theintegration of a square patch with corner truncation and a smaller concentriccircular patch with double slits. The first resonance is provided by the largerpatch whose corner truncation generates two orthogonal modes. The inner patchcontrols the higher-order resonance with the CP contributed by two narrowslits. The higher order resonating frequency can be monitored by controllingthe dimensions of the circle and the slits. The antenna provides the CP in twoorthogonal planes with two different sense of polarisation. The lower order CPis of left-handed orientation, whereas the higher order shows right-handedpolarization. The cross-polarization level is also found to be very low.

Compact Design of Dual-Band Circular Polarized Microstrip Antenna with Single Feed