A reconfigurable polarization antenna includes a microwave dielectric substrate having a ground plane that has a centrally located slot with five conducting patches, four of which form an evenly spaced apart perimeter group with a gap between each and the fifth, centrally positioned conducting patch. A conducting pad is positioned in each gap and is connected via a switch to the ground plane. A microstrip feed line including a short stub is positioned on the opposite side of the substrate and electromagnetically coupled to the slot. The polarization of the antenna is reconfigured by a selection of an on or off state of each of said switches. 13 Claims, 11 Drawing Sheets * * * * *
A dual‐band element that operates with dual‐circular polarisation in two separate industrial, scientific and medical bands is presented. The design that is based on concentric square slot/shorted‐ring configuration is realisable in cost‐effective printed circuit board technology making it attractive for low‐cost personal communications devices. The antenna element provides a flexible topology that allows for convenient, independent control of the polarisation and impedance bandwidth of two distinct frequency bands with no fundamental limitation on the ratio between the high‐ and low‐band frequency ranges. The topology of this element is presented, and the antenna concept is validated via simulated and measured results.
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