Method for Broadening the Beamwidths of Crossed Dipole for Wideband Marine GPS Applications

Abstract

Abstract-In this paper, a method to broaden the beamwidths of a crossed dipole antenna is proposed. By introducing four parasitic strips around the crossed dipole antenna, the beamwidths of the crossed dipole antenna in the vertical plane are broadened effectively, making the patterns uniform over a wide frequency band. An Lband prototype, operating in the frequency range 1.1 GHz to 1.6 GHz, is fabricated and tested. The simulated and measured results show that the beamwidths at lower frequencies are broadened and uniform radiation patterns over the whole operating frequency band are obtained, making the crossed dipole suitable for wideband marine GPS (Global Positioning System) applications.

Varactor-Loaded Pattern Reconfigurable Array for Wide-Angle Scanning With Low Gain Fluctuation

“…Many techniques of enlarging the 3 dB beamwidth of the isolated antenna element have been developed to extend the scanning range of phased arrays [4], [5]. For example, a microstrip-dielectric antenna was proposed to widen the 3 dB beamwidth by making one part of energy fed in the combined antenna propagate along the extended substrates and radiate at the edges of the substrate to enhance the antenna radiation in horizontal direction [6].…”

Studyof Crosseddipole Antennafor UHF SatelliteCommunication Applicationsand its limitations

“…Reduction of cross-coupling of crossed dipole can produce cleaner images under suitable conditions and depending on the targets of interest. A method was proposed [3] to broaden the beam width of a crossed dipole antenna. By using four parasitic strips around the crossed dipole antenna, the beam widths were broadened effectively in the vertical plane over a wide frequency band.…”