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This letter describes a square patch antenna with a switchable circular polarization (CP) sense. The proposed antenna has four L-shaped slots on the ground plane, and the CP radiation can be generated by current perturbation due to the slotted ground plane. Because the CP sense of the proposed antenna is altered by the current path that is redirected with switched p-i-n diodes on the slots, the CP...
A circular microstrip patch antenna with a circular polarization (CP) sense using a slotted ground structure is proposed at 2.4 GHz. To generate a CP sense, an unequal cross-shaped slot on a ground plane is utilized as a perturbation. The proposed antenna has two input ports: one for a right-handed (RH) CP and the other one for a left-handed (LH) CP. This configuration has benefit of a separated input...
The novel printed crossed 2times2 dipole array is proposed for broad axial ratio (AR) bandwidth. The broad bandwidth of axial ratio is due to a parasitic dipole crossing over the original dipole that is driven by a semi-rigid coaxial feed with the characteristic impedance of 75 Omega. The crossed dipole, a unit element of the dipole array proposed in this paper, can produce a broad circularly polarized...
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