Improved Cross-Polarized Radiation and Wide Impedance Bandwidth From Rectangular Microstrip Antenna With Dumbbell-Shaped Defected Patch Surface


Rectangular patch with dumbbell-formed defected patch surface has been studied theoretically and experimentally to enhance polarization purity over wide angular range and broad impedance bandwidth. More than 30 dB co- to cross-polarization (CP-XP) ratio over entire angular range around the broadside direction with wide impedance bandwidth is obtained. Moreover, this structure is free from back radiation in terms of XP fields, and it will efficiently suppress the XP radiation in numerous diagonal planes. The present structure is very straightforward and simple to manufacture. This investigation provides an insightful visualization-primarily based understanding of concurrent improvement in impedance bandwidth and therefore the XP radiation characteristics with the present structure.

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